WebAuthn

This feature is available to licensed FusionAuth instances as of version 1.52.0. A free license is available in the Plan tab for any user who registers in the account portal.

Overview

This API has been available since 1.41.0

This page contains all of the APIs for managing WebAuthn passkeys, sometimes referred to as credentials, and starting and completing WebAuthn ceremonies.

The following APIs are provided to manage WebAuthn passkeys.

Retrieve a Passkey

This API is used to retrieve information about a single WebAuthn passkey or all of a user’s registered passkeys.

Request

Retrieve a single Passkey by Id

GET /api/webauthn/{id}

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

The tenant Id is not required on this request even when more than one tenant has been configured because the tenant can be identified based upon the request parameters or it is otherwise not required.

Specify a tenant Id on this request when you want to ensure the request is scoped to a specific tenant. The tenant Id may be provided through this header or by using a tenant locked API key to achieve the same result.

See Making an API request using a Tenant Id for additional information.

Request Parameters

idUUIDrequired

The unique Id of the WebAuthn passkey to retrieve.

Retrieve all Passkeys belonging to a User

GET /api/webauthn?userId={userId}

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Parameters

userIdUUIDrequired

The unique Id of the User to retrieve WebAuthn passkeys for.

Response

The response for this API contains either a single Passkey or all of the Passkeys belonging to a User. When you call this API with an Id, the response will contain just that Passkey. When you call this API without an Id and provide a User Id in the query string, the response will contain all of the Passkeys belonging to that User. Both response types are defined below along with an example JSON response.

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
401	You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See Authentication.
404	The object you requested doesn't exist. The response will be empty.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Response Body

credential.algorithmLong

The identifier for the signing algorithm used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

Supported algorithms

Name	Value	Description
RS256	-257	RSASSA-PKCS1-v1_5 using SHA-256
RS384	-258	RSASSA-PKCS1-v1_5 using SHA-384
RS512	-259	RSASSA-PKCS1-v1_5 using SHA-512
PS256	-37	RSASSA-PSS w/ SHA-256
PS384	-38	RSASSA-PSS w/ SHA-384
PS512	-39	RSASSA-PSS w/ SHA-512
ES256	-7	ECDSA w/ SHA-256
ES384	-35	ECDSA w/ SHA-384
ES512	-36	ECDSA w/ SHA-512

credential.attestationTypeString

The type of attestation provided when the passkey was registered. Passkeys registered in FusionAuth will have a value of none. Imported passkeys may have another value.

credential.authenticatorSupportsUserVerificationBoolean

Indicates whether this authenticator supports user verification. User verification ensures that the user is authorized to use the authenticator.

This value is currently determined by whether user verification occurred during the registration of this passkey rather than by other means, such as examining FIDO authenticator metadata.

credential.credentialIdString

The credential Id generated by the authenticator is stored as a base64url-encoded string. This value is used by authenticators to look up a passkey during an authentication ceremony and to prevent multiple passkeys from being registered on the same authenticator for a single user.

credential.dataObject

An object that can hold any information about the passkey that should be persisted.

credential.discoverableBoolean

Indicates whether the passkey is “client-side discoverable.” Discoverable passkeys can be used in authentication ceremonies without first identifying the user (e.g. by requiring the user to complete a form field).

credential.displayNameString

The display name for the passkey selected during registration. This value should have been selected by the user.

credential.idUUID

The unique identifier for this passkey.

credential.insertInstantLong

The instant that the passkey was added to the FusionAuth database.

credential.lastUseInstantLong

The instant that the passkey was last used to complete a WebAuthn ceremony.

credential.nameString

A unique name meant to disambiguate passkeys with the same credential.displayName .

credential.publicKeyString

The passkey’s public key, encoded in PEM format.

credential.relyingPartyIdString

The Relying Party Id used at the time the passkey was registered.

credential.signCountInteger

A signature counter for the passkey. The signature count can be used by a Relying Party to identify a cloned or malfunctioning authenticator.

credential.tenantIdUUID

The Id of the tenant to which this passkey belongs.

credential.transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify eligible authenticators during a WebAuthn ceremony.

FusionAuth treats the list of transports as strings to maximize authenticator compatibility. These values are used as hints during WebAuthn ceremonies and missing, extra, or unexpected values should not cause a ceremony to fail. Some common values are: +

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

credential.userAgentString

The user agent at the time the passkey was registered. This can be useful for troubleshooting purposes.

credential.userIdUUID

The Id of the user that this passkey belongs to.

Example Response JSON

{
  "credential": {
    "algorithm": -7,
    "attestationType": "none",
    "authenticatorSupportsUserVerification": true,
    "credentialId": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "data": {},
    "displayName": "Chrome Touch ID",
    "name": "richard@fusionauth.io",
    "id": "c664318a-2384-4c35-9475-9a200e1d3b72",
    "insertInstant": 1668011701792,
    "discoverable": false,
    "lastUseInstant": 1668021630599,
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
    "relyingPartyId": "piedpiper.com",
    "signCount": 41,
    "tenantId": "30663132-6464-6665-3032-326466613934",
    "transports": [
      "internal"
    ],
    "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
  }
}

Response Body

credentials[x]Array

The list of WebAuthn Passkey objects.

credentials[x].algorithmLong

The identifier for the signing algorithm used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

Supported algorithms

Name	Value	Description
RS256	-257	RSASSA-PKCS1-v1_5 using SHA-256
RS384	-258	RSASSA-PKCS1-v1_5 using SHA-384
RS512	-259	RSASSA-PKCS1-v1_5 using SHA-512
PS256	-37	RSASSA-PSS w/ SHA-256
PS384	-38	RSASSA-PSS w/ SHA-384
PS512	-39	RSASSA-PSS w/ SHA-512
ES256	-7	ECDSA w/ SHA-256
ES384	-35	ECDSA w/ SHA-384
ES512	-36	ECDSA w/ SHA-512

credentials[x].attestationTypeString

The type of attestation provided when the passkey was registered. Passkeys registered in FusionAuth will have a value of none. Imported passkeys may have another value.

credentials[x].authenticatorSupportsUserVerificationBoolean

Indicates whether this authenticator supports user verification. User verification ensures that the user is authorized to use the authenticator.

This value is currently determined by whether user verification occurred during the registration of this passkey rather than by other means, such as examining FIDO authenticator metadata.

credentials[x].credentialIdString

credentials[x].dataObject

An object that can hold any information about the passkey that should be persisted.

credentials[x].discoverableBoolean

credentials[x].displayNameString

The display name for the passkey selected during registration. This value should have been selected by the user.

credentials[x].idUUID

The unique identifier for this passkey.

credentials[x].insertInstantLong

The instant that the passkey was added to the FusionAuth database.

credentials[x].lastUseInstantLong

The instant that the passkey was last used to complete a WebAuthn ceremony.

credentials[x].nameString

A unique name meant to disambiguate passkeys with the same credential.displayName .

credentials[x].publicKeyString

The passkey’s public key, encoded in PEM format.

credentials[x].relyingPartyIdString

The Relying Party Id used at the time the passkey was registered.

credentials[x].signCountInteger

A signature counter for the passkey. The signature count can be used by a Relying Party to identify a cloned or malfunctioning authenticator.

credentials[x].tenantIdUUID

The Id of the tenant to which this passkey belongs.

credentials[x].transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify eligible authenticators during a WebAuthn ceremony.

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

credentials[x].userAgentString

The user agent at the time the passkey was registered. This can be useful for troubleshooting purposes.

credentials[x].userIdUUID

The Id of the user that this passkey belongs to.

Example Response JSON

{
  "credentials": [
    {
      "algorithm": -7,
      "attestationType": "none",
      "authenticatorSupportsUserVerification": true,
      "credentialId": "HdN9wqP9mqOonacmiM2gIjASFYg",
      "data": {},
      "displayName": "Chrome Touch ID",
      "name": "richard@fusionauth.io",
      "id": "c664318a-2384-4c35-9475-9a200e1d3b72",
      "insertInstant": 1668011701792,
      "discoverable": false,
      "lastUseInstant": 1668021630599,
      "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
      "relyingPartyId": "piedpiper.com",
      "signCount": 41,
      "tenantId": "30663132-6464-6665-3032-326466613934",
      "transports": [
        "internal"
      ],
      "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
    }
  ]
}

Delete a Passkey

This API is used to delete a single WebAuthn passkey or all of a user’s registered passkeys.

Request

Delete a single Passkey by Id

DELETE /api/webauthn/{id}

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Parameters

idUUIDrequired

The unique Id of the WebAuthn passkey to delete.

Delete all Passkeys belonging to a User

DELETE /api/webauthn?userId={userId}

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Parameters

userIdUUIDrequired

The unique Id of the User to delete WebAuthn passkeys for.

Response

This API does not return a JSON response body.

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
401	You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See Authentication.
404	The object you requested doesn't exist. The response will be empty.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Import Passkeys

This API is used to bulk import multiple passkeys into FusionAuth. Reasonable defaults are provided for optional fields. This request is useful for migrating data from an existing database into FusionAuth.

Request

Import Multiple Passkeys

POST /api/webauthn/import

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request. The tenant Id is not required on this request when only one tenant has been configured. If there is more than one tenant, the tenant Id is required.

Supply the tenant Id via this header or by using an API Key scoped to a tenant, which implicitly supplies the tenant Id.

See Making an API request using a Tenant Id for additional information.

Request Body

credentialsArrayrequired

The list of passkeys to import.

credentials[x].algorithmLongrequired

The identifier for the signing algorithm used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

Supported algorithms

Name	Value	Description
RS256	-257	RSASSA-PKCS1-v1_5 using SHA-256
RS384	-258	RSASSA-PKCS1-v1_5 using SHA-384
RS512	-259	RSASSA-PKCS1-v1_5 using SHA-512
PS256	-37	RSASSA-PSS w/ SHA-256
PS384	-38	RSASSA-PSS w/ SHA-384
PS512	-39	RSASSA-PSS w/ SHA-512
ES256	-7	ECDSA w/ SHA-256
ES384	-35	ECDSA w/ SHA-384
ES512	-36	ECDSA w/ SHA-512

credentials[x].attestationTypeStringDefaults to none

The attestation type provided when the passkey was registered. FusionAuth doesn’t validate the attestation on import. Supported values are:

anonymization-ca
attestation-ca
basic
none
self

Passkeys registered in FusionAuth currently only support the none option, but another value can be supplied during passkey import.

credentials[x].authenticatorSupportsUserVerificationBooleanDefaults to false

Indicates whether this authenticator supports user verification. User verification ensures that the user is authorized to use the authenticator.

credentials[x].credentialIdStringrequired

The credential Id generated by the authenticator is stored as a base64url-encoded string. This value is used by authenticators to look up a passkey during an authentication ceremony.

credentials[x].dataObject

An object that can hold any information about the passkey that should be persisted.

credentials[x].discoverableBooleanDefaults to false

credentials[x].displayNameStringrequired

The display name for the passkey.

credentials[x].idUUIDDefaults to secure random UUID

The Id of the passkey. If not specified a secure random UUID will be generated.

credentials[x].insertInstantLongDefaults to now

The instant when the passkey was created.

credentials[x].lastUseInstantLongDefaults to now

The instant when the passkey was last used.

credentials[x].nameStringrequired

A unique name meant to disambiguate passkeys with the same credential.displayName .

Prior to version 1.42.0 this field was optional.

credentials[x].publicKeyStringrequired

The passkey’s public key, encoded in PEM format.

credentials[x].relyingPartyIdStringrequired

The Relying Party Id used at the time the passkey was registered.

This value must match the rpId value when the passkey was created, and the browser origin during WebAuthn authentication in FusionAuth must be compatible with that Relying Party Id.

credentials[x].signCountIntegerDefaults to 0

The last known signature count for the passkey.

credentials[x].transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint during the WebAuthn authentication ceremony to help identify eligible authenticators.

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

The default value is the empty set, which means that no hints are provided. This does not negatively impact the authentication ceremony.

credentials[x].userAgentString

The user agent at the time the passkey was registered. This can be useful for troubleshooting WebAuthn passkey issues.

credentials[x].userIdUUIDrequired

The Id of the user to which this passkey belongs.

validateDbConstraintsBooleanDefaults to false

Set this value to true in order to perform additional validation of the request.

The import request is intended to be used to migrate existing users’ passkeys from one system to another, this means FusionAuth expects all user Ids from the request to exist for the provided tenant. If a non-existent user Id is encountered a 500 will be returned unless this field is set to true.

In order to get additional details about database constraint violations on import, set this value to true and a 400 response will be returned with a JSON body indicating the missing values encountered.

Setting this value to true will dramatically decrease the performance of this request. If importing large numbers of passkeys in a single request you may need to increase request timeouts to ensure this request does not timeout before it has completed.

Example Request JSON

{
  "credentials": [
    {
      "algorithm": -7,
      "credentialId": "vBD52q2FMMM-zxaO-ZMgrN3ewjbmb0ra5E-QCX_3kz0",
      "displayName": "YubiKey",
      "name": "richard@fusionauth.io",
      "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
      "relyingPartyId": "piedpiper.com",
      "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
    },
    {
      "algorithm": -7,
      "attestationType": "none",
      "authenticatorSupportsUserVerification": true,
      "credentialId": "HdN9wqP9mqOonacmiM2gIjASFYg",
      "data": {},
      "displayName": "Chrome Touch ID",
      "name": "richard@fusionauth.io",
      "id": "c664318a-2384-4c35-9475-9a200e1d3b72",
      "insertInstant": 1668011701792,
      "discoverable": false,
      "lastUseInstant": 1668021630599,
      "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
      "relyingPartyId": "piedpiper.com",
      "signCount": 41,
      "transports": [
        "internal"
      ],
      "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
    }
  ]
}

Response

Only a status code is available on the Import API, no JSON body will be returned.

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
401	You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See Authentication.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

WebAuthn JavaScript API Binary Format

The WebAuthn JavaScript API navigator.credentials.create() and navigator.credentials.get() expect to receive fields containing binary data on the options object as a JavaScript ArrayBuffer and will return binary fields as ArrayBuffers. In order to prevent encoding issues on the FusionAuth API, these fields are passed over the network as base64url-encoded strings.

Select fields on the options JSON object that is passed to the WebAuthn JavaScript API must be converted from base64url-encoded strings to ArrayBuffers after receiving options from the FusionAuth API. Likewise, certain fields on WebAuthn JavaScript API responses must be converted from ArrayBuffers to base64url-encoded strings before calling FusionAuth’s APIs to complete the ceremony.

Converting base64url-encoded String to `ArrayBuffer`

Converting a base64url-encoded strings to ArrayBuffers is required before the options JSON object from Start a WebAuthn Passkey Registration or Start a WebAuthn Passkey Assertion or Authentication responses are passed to the WebAuthn JavaScript API. The FusionAuth hosted pages will perform this conversion as necessary. If you need to perform this conversion yourself, you can use the following JavaScript function.

Function to convert a base64url-encoded string to an ArrayBuffer

function base64URLToBuffer(base64URL) {
  const base64 = base64URL.replace(/-/g, '+').replace(/_/g, '/');
  const padLen = (4 - (base64.length % 4)) % 4;
  return Uint8Array.from(atob(base64.padEnd(base64.length + padLen, '=')), c => c.charCodeAt(0));
}

Fields that require this conversion are documented in the Start a WebAuthn Passkey Registration and Start a WebAuthn Passkey Assertion or Authentication response sections.

Converting `ArrayBuffer` to base64url-encoded String

Converting ArrayBuffers to base64url-encoded strings is required before the responses from the WebAuthn JavaScript APIs are sent to FusionAuth’s Complete a WebAuthn Passkey Registration , Complete a WebAuthn Passkey Authentication , or Complete a WebAuthn Passkey Assertion APIs. The FusionAuth hosted pages will perform this conversion as necessary. If you need to perform this conversion yourself, you can use the following JavaScript function.

Function to convert an ArrayBuffer to a base64url-encoded string

function bufferToBase64URL(buffer) {
  const bytes = new Uint8Array(buffer);
  let string = '';
  bytes.forEach(b => string += String.fromCharCode(b));

  const base64 = btoa(string);
  return base64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
}

Fields that require this conversion are documented in the Complete a WebAuthn Passkey Registration , Complete a WebAuthn Passkey Authentication , and Complete a WebAuthn Passkey Assertion request sections.

Start a WebAuthn Passkey Registration

This API is used to start a WebAuthn registration ceremony by providing some details about the current user and the new passkey. The response is a JSON object which is suitable to be passed to the WebAuthn JavaScript API navigator.credentials.create() function and includes a one-time challenge unique to the current registration ceremony.

Request

Start a WebAuthn Registration Ceremony and Retrieve Passkey Creation Options

POST /api/webauthn/register/start

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Body

displayNameStringrequired

The primary display name for the new passkey.

nameString

The optional name for the passkey. This is meant to disambiguate passkeys with the same displayName . When this parameter is omitted, it will be defaulted to the user’s email address. If the user does not have an email address, this parameter will be defaulted to their username instead.

Prior to version 1.42.0 name was defaulted to a random four character alphanumeric string.

The passkey name is set at the time the passkey is registered. There is currently no way to change the name of the passkey. Prompts displayed by the WebAuthn JavaScript API will continue to display the original value at the time the passkey was registered even if the user updates their email address or username. In order to display the updated email or username the user must register a new passkey.

userAgentString

The user’s browser’s user agent string. This value is meant for troubleshooting issues with passkeys.

userIdUUIDrequired

The Id of the user registering the passkey.

workflowStringrequired

The WebAuthn workflow this passkey is intended to be used with. Selecting the proper value will provide the best user experience by limiting the registration ceremony to authenticators which support the features needed for each workflow. The selected workflow will change the creation options on the response based on the tenant configuration. The possible values are:

bootstrap - The passkey is intended for use with the bootstrap workflow, which requires the user to “bootstrap” the authentication process by identifying themselves prior to the WebAuthn ceremony and can be used to authenticate from a new device using WebAuthn.
general - The passkey is not intended for any particular workflow. This value will allow for the most flexible use of the new passkey.
reauthentication - The passkey is intended for use with the re-authentication workflow, which provides a streamlined user experience for repeated logins from the same device.

Example Request JSON

{
  "displayName": "Chrome Touch ID",
  "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457",
  "workflow": "reauthentication"
}

Response

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
401	You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See Authentication.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Response Body

The response body contains options to be passed to the WebAuthn JavaScript API. The options.challenge , options.user.id , and options.excludeCredentials[x].id fields must be converted to ArrayBuffers for the navigator.credentials.create() request. See WebAuthn JavaScript API Binary Format for details.

optionsObject

The WebAuthn public key credential creation options. This object is passed to the WebAuthn JavaScript API to create a new passkey.

options.attestationString

The Relying Party’s attestation conveyance preference. Currently supported values include:

none - The Relying Party is not interested in authenticator attestation.

options.authenticatorSelection.authenticatorAttachmentString

The Relying Party’s authenticator attachment preference. Authenticators eligible for the current registration ceremony will be limited according to this requested attachment preference. Possible values are:

platform - The authenticator is integrated with the current device. These typically use the device’s unlock mechanism for user verification (e.g. Touch ID, PIN, pattern).
cross-platform - The authenticator can be used between multiple devices such as a USB security key or Bluetooth-connected phone.
null (or omitted) - The Relying Party has no attachment preference. Any attachment will be allowed.

options.authenticatorSelection.userVerificationString

The Relying Party’s user verification requirement. Eligible authenticators will be filtered according to this preference. Possible values are:

discouraged - The Relying Party does not want user verification to be used.
preferred - The Relying Party prefers that user verification is used if available but will not fail the ceremony if it is not provided.
required - The Relying Party requires user verification for the operation.

options.challengeString

This field contains a base64url-encoded string that acts as a one-time challenge for the ceremony. This makes WebAuthn resistant to certain kinds of replay attacks.

See Converting base64url-encoded String to ArrayBuffer for details on converting this value for the WebAuthn JavaScript API call.

options.excludeCredentialsArray

A list of passkeys whose generating authenticators should be excluded from the current registration ceremony. This is meant to prevent a user creating multiple passkeys for the same account on the same authenticator.

options.excludeCredentials[x].idString

The credential Id generated by the authenticator as a base64url-encoded string. An available authenticator that owns any passkey with one of these Ids is excluded from the current ceremony.

See Converting base64url-encoded String to ArrayBuffer for details on converting these values for the WebAuthn JavaScript API call.

options.excludeCredentials[x].transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify authenticators containing one of the options.excludeCredentials .

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

options.excludeCredentials[x].typeString

The credential type the current passkey refers to. The only value supported by WebAuthn is public-key.

options.extensions.credPropsBoolean

If true, the Relying Party will request the client to report on whether the new passkey is a client-side discoverable credential.

options.pubKeyCredParamsArray

A list of the Relying Party’s acceptable options for the type of passkey and its signing algorithm in order of preference.

options.pubKeyCredParams[x].algLong

The identifier for the signing algorithm to be used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

options.pubKeyCredParams[x].typeString

The credential type the current passkey refers to. The only value supported by WebAuthn is public-key.

options.rp.idString

The Relying Party Id for this registration ceremony. Passkeys can only be used to authenticate on sites using the same Relying Party Id they were registered with.

If this value is null or omitted, the WebAuthn JavaScript API will use the browser origin as the Relying Party Id.

options.rp.nameString

The name of the Relying Party requesting a new passkey to be created. This value is intended for display during WebAuthn ceremonies.

options.timeoutLong

The number of milliseconds the Relying Party is willing to wait for the ceremony to complete. This value is treated as a hint and may be overridden by the client. This is an unsigned value.

options.user.displayNameString

A human-readable display name for the new passkey. This value may be displayed during the current and future WebAuthn ceremonies.

options.user.idString

A user handle that can be used by the Relying Party to uniquely identify the user registering the passkey. FusionAuth uses the base64url-encoded unique Id for the user.

See Converting base64url-encoded String to ArrayBuffer for details on converting this value for the WebAuthn JavaScript API call.

options.user.nameString

A human-readable name for the passkey intended for display. This value is meant to disambiguate between passkeys with a similar displayName .

Example Response JSON

{
  "options": {
    "attestation": "none",
    "authenticatorSelection": {
      "authenticatorAttachment": "platform",
      "userVerification": "required"
    },
    "challenge": "fdnW2u1_Nk9_FY2SprU4mPs0NgBTbo9tOO5Q9EvO1Oc",
    "excludeCredentials": [
      {
        "id": "MBU0eBsaNAt4VEh4Lbn2sQ==",
        "transports": [
          "internal"
        ],
        "type": "public-key"
      }
    ],
    "extensions": {
      "credProps": true
    },
    "pubKeyCredParams": [
      {
        "alg": -36,
        "type": "public-key"
      },
      {
        "alg": -35,
        "type": "public-key"
      },
      {
        "alg": -7,
        "type": "public-key"
      },
      {
        "alg": -39,
        "type": "public-key"
      },
      {
        "alg": -38,
        "type": "public-key"
      },
      {
        "alg": -37,
        "type": "public-key"
      },
      {
        "alg": -259,
        "type": "public-key"
      },
      {
        "alg": -258,
        "type": "public-key"
      },
      {
        "alg": -257,
        "type": "public-key"
      }
    ],
    "rp": {
      "id": "piedpiper.com",
      "name": "Pied Piper"
    },
    "timeout": 180000,
    "user": {
      "displayName": "Chrome Touch ID",
      "id": "NzAzZmUyZDItMmQzOS00Y2I3LWI3NmQtMGI5OTE4ZWQyNDU3",
      "name": "richard@fusionauth.io"
    }
  }
}

Complete a WebAuthn Passkey Registration

This API is used to complete a WebAuthn registration ceremony by providing the values returned from the WebAuthn JavaScript API call. The API will validate the request against configured passkey requirements for the workflow and the one-time challenge generated and returned by Start a WebAuthn Passkey Registration .

Request

Complete a WebAuthn Registration Ceremony and Return Passkey Details

POST /api/webauthn/register/complete

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Body

The credential in the request body contains data returned by the WebAuthn JavaScript API call. The credential.response.attestationObject and credential.response.clientDataJSON fields must be converted to base64url-encoded strings for the FusionAuth API request. See WebAuthn JavaScript API Binary Format for details.

credential.clientExtensionResults.credProps.rkBoolean

If true, the new passkey is “client-side discoverable,” meaning that it can be used in authentication ceremonies without first identifying the user (e.g. by requiring the user to complete a form field). If false, or the credential.clientExtensionResults.credProps field is omitted, the passkey should be treated as if it were not client-side discoverable. FusionAuth does not currently support discoverable credentials (sometimes referred to as “resident keys”).

credential.idStringrequired

A base64url-encoded version of the credential Id generated by the authenticator for this passkey.

credential.rpIdString

If the tenant configuration overrides the Relying Party Id, this parameter should match tenant.webAuthnConfiguration.relyingPartyId , otherwise the value should be omitted from the request object.

credential.response.attestationObjectStringrequired

The base64url-encoded attestation data from the WebAuthn JavaScript API response, which includes information on the new passkey and other data important for validation. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.response.clientDataJSONStringrequired

The base64url-encoded client data from the WebAuthn JavaScript API response. This contains important information for the WebAuthn registration validation process, including the one-time challenge generated when the registration ceremony began. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify eligible authenticators during a WebAuthn ceremony.

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

credential.typeStringrequired

The credential type of the new passkey. The only value supported by WebAuthn is public-key.

originStringrequired

The browser request origin during the registration ceremony.

rpIdStringrequired

If the tenant configuration overrides the Relying Party Id, this parameter should match tenant.webAuthnConfiguration.relyingPartyId , otherwise the value should be the browser request origin’s effective domain during the ceremony.

userIdUUIDrequired

The unique Id of the user registering this new passkey.

Example Request JSON

{
  "credential": {
    "clientExtensionResults": {
      "credProps": {
        "rk": true
      }
    },
    "id": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "response": {
      "attestationObject": "v2dhdHRTdG109mhhdXRoRGF0YViemPsv4VW-wth0V9gzsxWRFn-1SyC9gM4-QC4ptMFDNhVFAAAAFmhGAxjmXUwbl-q5EoJkWH0AELmJieDlA5kNXEtcIgWnp1a_YTMmYTECYi0xAWItMlggTmZZ1aeY0PP8-Ebdufqcg9TWEs_mJaFJmJ57uRyQ1BxiLTNYIQCzqsN1dkCeZKpWGKEVP0-eqBlkKGNCjfcdg5221SRZX_9jZm10ZG5vbmX_",
      "clientDataJSON": "eyJjaGFsbGVuZ2UiOiJ2dHk0WG1ES01EMmxTc2dVOEpsOFlIVEtBcGZlWXpMdkRVUksxTXpGd1JvIiwiY3Jvc3NPcmlnaW4iOmZhbHNlLCJvcmlnaW4iOiJodHRwczovL2Z1c2lvbmF1dGguaW8iLCJ0eXBlIjoid2ViYXV0aG4uY3JlYXRlIn0="
    },
    "transports": [
      "internal"
    ],
    "type": "public-key"
  },
  "origin": "https://auth.piedpiper.com",
  "rpId": "piedpiper.com",
  "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
}

Response

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Response Body

credential.algorithmLong

The identifier for the signing algorithm used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

Supported algorithms

Name	Value	Description
RS256	-257	RSASSA-PKCS1-v1_5 using SHA-256
RS384	-258	RSASSA-PKCS1-v1_5 using SHA-384
RS512	-259	RSASSA-PKCS1-v1_5 using SHA-512
PS256	-37	RSASSA-PSS w/ SHA-256
PS384	-38	RSASSA-PSS w/ SHA-384
PS512	-39	RSASSA-PSS w/ SHA-512
ES256	-7	ECDSA w/ SHA-256
ES384	-35	ECDSA w/ SHA-384
ES512	-36	ECDSA w/ SHA-512

credential.attestationTypeString

The type of attestation provided when the passkey was registered. Passkeys registered in FusionAuth will have a value of none. Imported passkeys may have another value.

credential.authenticatorSupportsUserVerificationBoolean

Indicates whether this authenticator supports user verification. User verification ensures that the user is authorized to use the authenticator.

This value is currently determined by whether user verification occurred during the registration of this passkey rather than by other means, such as examining FIDO authenticator metadata.

credential.credentialIdString

credential.dataObject

An object that can hold any information about the passkey that should be persisted.

credential.discoverableBoolean

credential.displayNameString

The display name for the passkey selected during registration. This value should have been selected by the user.

credential.idUUID

The unique identifier for this passkey.

credential.insertInstantLong

The instant that the passkey was added to the FusionAuth database.

credential.lastUseInstantLong

The instant that the passkey was last used to complete a WebAuthn ceremony.

credential.nameString

A unique name meant to disambiguate passkeys with the same credential.displayName .

credential.publicKeyString

The passkey’s public key, encoded in PEM format.

credential.relyingPartyIdString

The Relying Party Id used at the time the passkey was registered.

credential.signCountInteger

A signature counter for the passkey. The signature count can be used by a Relying Party to identify a cloned or malfunctioning authenticator.

credential.tenantIdUUID

The Id of the tenant to which this passkey belongs.

credential.transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify eligible authenticators during a WebAuthn ceremony.

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

credential.userAgentString

The user agent at the time the passkey was registered. This can be useful for troubleshooting purposes.

credential.userIdUUID

The Id of the user that this passkey belongs to.

Example Response JSON

{
  "credential": {
    "algorithm": -7,
    "attestationType": "none",
    "authenticatorSupportsUserVerification": true,
    "credentialId": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "data": {},
    "displayName": "Chrome Touch ID",
    "name": "richard@fusionauth.io",
    "id": "c664318a-2384-4c35-9475-9a200e1d3b72",
    "insertInstant": 1668011701792,
    "discoverable": false,
    "lastUseInstant": 1668021630599,
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
    "relyingPartyId": "piedpiper.com",
    "signCount": 41,
    "tenantId": "30663132-6464-6665-3032-326466613934",
    "transports": [
      "internal"
    ],
    "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
  }
}

Start a WebAuthn Passkey Assertion or Authentication

This API is used to start a WebAuthn authentication ceremony by providing some details about the current user and the new passkey. The response is a JSON object which is suitable to be passed to the WebAuthn JavaScript API navigator.credentials.get() function and includes a one-time challenge unique to the current ceremony. This same API is used to start a WebAuthn assertion that validates a passkey signature without authenticating the user.

Request

Start a WebAuthn Authentication Ceremony and Retrieve Passkey Request Options

POST /api/webauthn/start

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Body

applicationIdUUIDrequired

The Id for the application to which the user wishes to authenticate.

credentialIdUUID

The unique database Id for one of a user’s passkeys. When provided, the authentication ceremony will use this passkey. Otherwise, any of a user’s passkeys that meet the user verification requirement will be eligible for the authentication ceremony.

loginIdString

The email or the username of the authenticating user.

Required if userId is not present. If both fields are provided in the request body, the userId will be utilized.

stateObject

An optional object that will be returned un-modified when you complete the WebAuthn authentication request. This may be useful to return the user to a particular state once they complete the authentication.

userIdUUID

The unique Id of the authenticating user.

This field is marked optional, but you must provide either the loginId or the userId to complete this API. If both fields are provided in the request body, the userId will be utilized.

workflowStringrequired

The WebAuthn workflow for the current authentication ceremony. The workflow value changes the options object generated by this API. The options object is built to be passed to the WebAuthn JavaScript API call. The possible values are:

bootstrap - The user is authenticating using a WebAuthn passkey after providing their email, username, or other information to identify themselves.
reauthentication - The user is reauthenticating on a device they have previously authenticated from.

Example Request JSON

{
  "applicationId": "82b24314-95f6-4393-b3da-72c341185244",
  "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457",
  "workflow": "reauthentication"
}

Response

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
401	You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See Authentication.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Response Body

The response body contains options to be passed to the WebAuthn JavaScript API. The options.challenge and options.allowCredentials[x].id fields must be converted to ArrayBuffers for the navigator.credentials.get() request. See WebAuthn JavaScript API Binary Format for details.

optionsObject

The WebAuthn public key credential request options. This object is passed to the WebAuthn JavaScript API to generate an assertion using an available passkey.

options.allowCredentialsArray

An array containing identifying information for passkeys that are allowed to complete this authentication ceremony, ordered from most to least preferred.

options.allowCredentials[x].idString

The credential Id generated by the authenticator as a base64url-encoded string. This value is used to locate an authenticator that can complete the ceremony.

See Converting base64url-encoded String to ArrayBuffer for details on converting these values for the WebAuthn JavaScript API call.

options.allowCredentials[x].transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify authenticators containing one of the options.allowCredentials .

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

options.allowCredentials[x].typeString

The credential type the current passkey refers to. The only value supported by WebAuthn is public-key.

options.challengeString

This field contains a base64url-encoded string that acts as a one-time challenge for the ceremony. This makes WebAuthn resistant to certain kinds of replay attacks.

See Converting base64url-encoded String to ArrayBuffer for details on converting this value for the WebAuthn JavaScript API call.

options.rpIdString

The Relying Party Id for this authentication ceremony. Passkeys can only be used to authenticate on sites with the same Relying Party Id with which the passkeys were registered.

If this value is null or omitted, the WebAuthn JavaScript API will use the browser origin as the Relying Party Id.

options.timeoutLong

The number of milliseconds the Relying Party is willing to wait for the ceremony to complete. This value is treated as a hint and may be overridden by the client. This is an unsigned value.

options.userVerificationString

The Relying Party’s user verification requirement. Eligible authenticators will be filtered according to this preference. Possible values are:

discouraged - The Relying Party does not want user verification to be used.
preferred - The Relying Party prefers that user verification is used if available but will not fail the ceremony if it is not provided.
required - The Relying Party requires user verification for the operation.

Example Response JSON

{
  "options": {
    "allowCredentials": [
      {
        "id": "HdN9wqP9mqOonacmiM2gIjASFYg",
        "transports": [
          "internal"
        ],
        "type": "public-key"
      }
    ],
    "challenge": "fdnW2u1_Nk9_FY2SprU4mPs0NgBTbo9tOO5Q9EvO1Oc",
    "rpId": "piedpiper.com",
    "timeout": 180000,
    "userVerification": "required"
  }
}

Complete a WebAuthn Passkey Authentication

This API is used to complete a WebAuthn authentication ceremony by providing the values returned from the WebAuthn JavaScript API call. The API will validate the request against configured passkey requirements for the workflow and the one-time challenge generated and returned by Start a WebAuthn Passkey Assertion or Authentication .

Request

Complete a WebAuthn Authentication Ceremony

POST /api/webauthn/login

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Cookies

fusionauth.trustString

The Multi-Factor Trust identifier returned by the Multi-Factor Login API response. This value may be provided to bypass the Multi-Factor challenge when a User has Multi-Factor enabled. When this cookie exists on the request it will take precedence over the twoFactorTrustId if provided in the request body.

Request Body

The credential in the request body contains data returned by the WebAuthn JavaScript API call. The credential.response.authenticatorData , credential.response.clientDataJSON , credential.response.signature , and credential.response.userHandle fields must be converted to base64url-encoded strings for the FusionAuth API request. See WebAuthn JavaScript API Binary Format for details.

credential.clientExtensionResultsObject

The results for WebAuthn extensions requested during authentication. FusionAuth does not currently support any WebAuthn authentication extensions.

credential.idStringrequired

A base64url-encoded version of the credential Id used by the authenticator for this ceremony.

credential.rpIdString

If the tenant configuration overrides the Relying Party Id, this parameter should match tenant.webAuthnConfiguration.relyingPartyId , otherwise the value should be omitted from the request object.

credential.response.authenticatorDataStringrequired

The base64url-encoded authenticator data from the WebAuthn JavaScript API response, which includes information on the passkey used to complete the ceremony and other data important for validation. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.response.clientDataJSONStringrequired

The base64url-encoded client data from the WebAuthn JavaScript API response. This contains important information for the WebAuthn authentication validation process, including the one-time challenge generated when the registration ceremony began. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.response.signatureStringrequired

The base64url-encoded signature from the WebAuthn JavaScript API response. The authenticator generates the signature using the selected passkey’s private key by signing over the binary concatenation of credential.response.authenticatorData and the SHA-256 hash of credential.response.clientDataJSON before they are converted to base64url-encoded strings. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.response.userHandleString

The base64url-encoded user handle from the WebAuthn JavaScript API response. This field is only required when the user was not identified prior to the authentication ceremony through the use of a client-side discoverable passkey. See Converting ArrayBuffer to base64url-encoded String for details on converting this value for the FusionAuth API request.

credential.typeStringrequired

The credential type of the passkey. The only value supported by WebAuthn is public-key.

originStringrequired

The browser request origin during the authentication ceremony. For example, example.com.

rpIdStringrequired

twoFactorTrustIdString

The Multi-Factor Trust identifier returned by the Multi-Factor Login API response. This value may be provided to bypass the Multi-Factor challenge when a User has Multi-Factor enabled.

Example Request JSON

{
  "credential": {
    "id": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "response": {
      "authenticatorData": "mPsv4VW-wth0V9gzsxWRFn-1SyC9gM4-QC4ptMFDNhUFAAAAKQ==",
      "clientDataJSON": "eyJjaGFsbGVuZ2UiOiJTeTYzQldla285blFsYzVOQmVWcE1BWjFtQ0hvdzBXUXVFeDRJU2xuQzR3IiwiY3Jvc3NPcmlnaW4iOmZhbHNlLCJvcmlnaW4iOiJodHRwczovL2Z1c2lvbmF1dGguaW8iLCJ0eXBlIjoid2ViYXV0aG4uZ2V0In0=",
      "signature": "MEUCIQDUwlDp9aNcYQmvpVGLJ35H8lRWjWsfjVsfPf_5HhY3GwIgahBhISBxv82ZS4ll8TZiJp5bIN2CGx_-VjUymfzKqGA=",
      "userHandle": "NzAzZmUyZDItMmQzOS00Y2I3LWI3NmQtMGI5OTE4ZWQyNDU3"
    },
    "type": "public-key"
  },
  "origin": "https://auth.piedpiper.com",
  "rpId": "piedpiper.com"
}

Response

The response for this API contains the User object.

Response Codes

Code	Description
200	The authentication was successful. The response will contain the User object that was authenticated.
202	The user was authenticated successfully. The user is not registered for the application specified by the `applicationId` on the request. The response will contain the User object that was authenticated.
203	The user was authenticated successfully. The user is required to change their password, the response will contain the `changePasswordId` to be used on the Change Password API. Since version `1.15.0`, the response will also contain a `changePasswordReason` field which can have one of the following values: `Administrative` - An administrator has required this user to change their password. `Breached` - The password has been found to have belonged to a breached dataset and must be changed, per the Reactor configuration. `Expired` - The password has expired, per the expiration setting in the tenant configuration. `Validation` - The password fails the validation rules configured in the tenant password settings. Example Response JSON `{ "changePasswordId": "XOgai4Ro68xfGiex0ngXiJ2bbhduM4Pm7h3lvF0xibQ", "changePasswordReason": "Expired" }`
212	The user’s email address has not yet been verified. The response will contain the User object that was authenticated. If the emailConfiguration.verificationStrategy has been set to `FormField`, the response will contain the emailVerificationId that was generated for the user.
213	The user’s registration has not yet been verified. The response will contain the User object that was authenticated. If the emailConfiguration.verificationStrategy has been set to `FormField`, the response will contain the registrationVerificationId that was generated for the user. Prior to version `1.27.0`, this status code was not returned, and you will see a `200` instead.
242	The user was authenticated successfully. The user has two factor authentication enabled. Since version `1.42.0`, this status code is also returned when two factor authentication is required. The response will contain the `twoFactorId` to be used on the Complete Two Factor Authentication API. Example Response JSON `{ "methods": [ { "authenticator": { "algorithm": "HmacSHA1", "codeLength": 6, "timeStep": 30 }, "id": "2KSZ", "method": "authenticator" }, { "email": "richard@fusionauth.io", "id": "KLRT", "method": "email" } ], "twoFactorId": "YkQY5Gsyo4RlfmDciBGRmvfj3RmatUqrbjoIZ19fmw4" }`
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors.
404	The user was not found or the password was incorrect. The response will be empty.
409	The user is currently in an action that has prevented login. The response will contain the actions that prevented login. Example Response JSON `{ "actions": [ { "actionId": "00000000-0000-0000-0000-000000000042", "actionerUserId": "00000000-0000-0001-0000-000000000000", "expiry": 1571786483322, "localizedName": "Prevent Login Action", "localizedReason": "Hard Lock", "name": "Prevent Login Action", "reason": "Hard Lock", "reasonCode": "hard_lock" } ] }`
410	The user has expired. The response will be empty.
423	The user is locked and cannot login. The response will be empty. Prior to version `1.9.0` a `404` status code will be returned instead.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.
504	One or more Webhook endpoints returned an invalid response or were unreachable. Based on the transaction configuration for this event your action cannot be completed. A stack trace is provided and logged in the FusionAuth log files.

Response Body

refreshTokenString

The refresh token that can be used to obtain a new access token once the provided one has expired.

Because a refresh token is per user and per application, this value will only be returned when an applicationId was provided on the login request and the user is registered to the application.

You must explicitly allow generation of refresh tokens when using the Login API.

Configure the application.loginConfiguration.generateRefreshTokens setting via the API or enable the setting by navigating to the Application -> My Application -> Security tab.

refreshTokenIdStringAvailable since 1.37.0

When the refreshToken is returned in the response, this field will also be returned. This unique Id is the persistent identifier for this refresh token, and will not change even when using one-time use refresh tokens. This value may optionally be used to revoke the token using the Refresh Token API.

stateObject

If authenticated using a One Time Password and state was provided during the Change Password request this value will be returned exactly as it was provided.

tokenStringAvailable since 1.16.0

The access token, this string is an encoded JSON Web Token (JWT).

tokenExpirationInstantLongAvailable since 1.33.0

The instant the token will expire. If the response does not contain a token , this field will also be omitted from the response.

user.activeBoolean

True if the User is active. False if the User has been deactivated. Deactivated Users will not be able to login.

user.birthDateString

The User’s birthdate formatted as YYYY-MM-DD

user.breachedPasswordLastCheckedInstantLong

The instant this user’s password was last checked to determine if it is compromised.

user.connectorIdUUIDAvailable since 1.18.0

The unique Id of the Connector associated with the System of Record being used to authenticate the user.

user.cleanSpeakIdUUID

This Id is used by FusionAuth when the User’s username is sent to CleanSpeak to be moderated (filtered and potentially sent to the approval queue). It is the content Id of the username inside CleanSpeak.

user.dataObject

An object that can hold any information about the User that should be persisted.

user.data.emailString

This field will be used as the email address if no user.email field is found.

This feature was removed in version 1.26.0 and added back in 1.27.2.

user.emailString

The User’s email address.

user.expiryLong

The expiration instant of the User’s account. An expired user is not permitted to login.

user.firstNameString

The first name of the User.

user.fullNameString

The User’s full name as a separate field that is not calculated from firstName and lastName .

user.idUUID

The User’s unique Id.

user.imageUrlString

The URL that points to an image file that is the User’s profile image.

user.insertInstantLong

The instant when the user was created.

user.lastLoginInstantLong

The instant when the User logged in last.

user.lastNameString

The User’s last name.

user.lastUpdateInstantLong

The instant when the User was last updated.

user.membershipsArray

The list of memberships for the User.

user.memberships[x].dataObject

An object that can hold any information about the User for this membership that should be persisted.

user.memberships[x].groupIdUUID

The Id of the Group of this membership.

user.memberships[x].idUUID

The unique Id of this membership.

user.memberships[x].insertInstantLong

The instant that the membership was created.

user.middleNameString

The User’s middle name.

user.mobilePhoneString

The User’s mobile phone number. This is useful if you will be sending push notifications or SMS messages to the User.

user.parentEmailStringAvailable since 1.7.0

The email address of the user’s parent or guardian. If this value was provided during a create or update operation, this value will only remain until the child is claimed by a parent.

user.passwordChangeRequiredBoolean

Indicates that the User’s password needs to be changed during their next login attempt.

user.passwordLastUpdateInstantLong

The instant that the User last changed their password.

user.preferredLanguagesArray<String>

An array of locale strings that give, in order, the User’s preferred languages. These are important for email templates and other localizable text. See Locales.

user.registrationsArray

The list of registrations for the User. This will include registrations for inactive applications.

user.registrations[x].applicationIdUUID

The Id of the Application that this registration is for.

user.registrations[x].authenticationTokenString

The Authentication Token for this registration (if one exists).

user.registrations[x].cleanSpeakIdUUID

This Id is used by FusionAuth when the User’s username for this registration is sent to CleanSpeak to be moderated (filtered and potentially sent to the approval queue). It is the content Id of the username inside CleanSpeak.

user.registrations[x].dataObject

An object that can hold any information about the User for this registration that should be persisted.

user.registrations[x].idUUID

The Id of this registration.

user.registrations[x].insertInstantLong

The instant that this registration was created.

user.registrations[x].lastLoginInstantLong

The instant that the User last logged into the Application for this registration.

user.registrations[x].preferredLanguagesArray<String>

An array of locale strings that give, in order, the User’s preferred languages for this registration. These are important for email templates and other localizable text.

user.registrations[x].rolesArray<String>

The list of roles that the User has for this registration. The string is the role’s Name not the role’s Id, e.g. admin or user-role.

user.registrations[x].timezoneString

The User’s preferred timezone for this registration. The string will be in an IANA time zone format.

user.registrations[x].tokensMap<String,StringDEPRECATED

A map that contains tokens returned from identity providers.

For example, if this user has authenticated using the Facebook Identity Provider, the Facebook access token will be available in this map, keyed by name Facebook. For an OpenID Connect Identity provider, or other generic providers, if a token is stored it will be keyed by the Identity Provider unique Id.

Removed in 1.28.0

The token returned and stored from the Identity Provider is now stored in the IdP link and is retrievable using the Identity Provider Link API.

user.registrations[x].usernameString

The username of the User for this registration only. This is for display purposes and cannot be used to login.

user.registrations[x].usernameStatusString

The current status of the username. This is used if you are moderating usernames via CleanSpeak. The possible values are:

ACTIVE - the username is active
PENDING - the username is pending approval/moderation
REJECTED - the username was rejected during moderation

If a username has been rejected, it is still possible to allow the User to update it and have the new one moderated again.

user.registrations[x].verifiedBoolean

This value indicates if this User’s registration has been verified.

For additional information, see these tutorials:

user.registrations[x].verifiedInstantLongAvailable since 1.48.0

The instant that this registration was verified.

user.tenantIdUUID

The Id of the Tenant that this User belongs to.

user.timezoneString

The User’s preferred timezone. This can be used as a default to display instants, and it is recommended that you allow Users to change this per-session. The string will be in an IANA time zone format.

user.twoFactor.methods[x].authenticator.algorithmString

The algorithm used by the TOTP authenticator. With the current implementation, this will always be HmacSHA1.

user.twoFactor.methods[x].authenticator.codeLengthInteger

The length of code generated by the TOTP. With the current implementation, this will always be 6.

user.twoFactor.methods[x].authenticator.timeStepInteger

The time-step size in seconds. With the current implementation, this will always be 30.

user.twoFactor.methods[x].emailString

The value of the email address for this method. Only present if user.twoFactor.methods[x].method is email.

user.twoFactor.methods[x].idString

The unique Id of the method.

user.twoFactor.methods[x].lastUsedBoolean

true if this method was used most recently.

user.twoFactor.methods[x].methodString

The type of this method. There will also be an object with the same value containing additional information about this method. The possible values are:

authenticator
email
sms

user.twoFactor.methods[x].mobilePhoneString

The value of the mobile phone for this method. Only present if user.twoFactor.methods[x].method is sms.

user.twoFactorDeliveryStringDEPRECATED

The User’s preferred delivery for verification codes during a two factor login request.

The possible values are:

None
TextMessage

Removed in 1.26.0

user.twoFactorEnabledBooleanDEPRECATED

Determines if the User has two factor authentication enabled for their account or not.

Removed in 1.26.0

user.usernameString

The username of the User.

user.usernameStatusString

The current status of the username. This is used if you are moderating usernames via CleanSpeak. The possible values are:

ACTIVE - the username is active
PENDING - the username is pending approval/moderation
REJECTED - the username was rejected during moderation

If a username has been rejected, it is still possible to allow the User to update it and have the new one moderated again.

user.verifiedBoolean

Whether or not the User’s email has been verified.

For additional information, see these tutorials:

user.verifiedInstantLongAvailable since 1.48.0

The instant that this email address was verified.

Note that this value is immutable and will only represent the first time the email was verified. If you enable re-verification on email change, this value will not change and will only represent the initial verification.

Example Response JSON

{
  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE0ODUxNDA5ODQsImlhdCI6MTQ4NTEzNzM4NCwiaXNzIjoiYWNtZS5jb20iLCJzdWIiOiIyOWFjMGMxOC0wYjRhLTQyY2YtODJmYy0wM2Q1NzAzMThhMWQiLCJhcHBsaWNhdGlvbklkIjoiNzkxMDM3MzQtOTdhYi00ZDFhLWFmMzctZTAwNmQwNWQyOTUyIiwicm9sZXMiOltdfQ.Mp0Pcwsz5VECK11Kf2ZZNF_SMKu5CgBeLN9ZOP04kZo",
  "user": {
    "active": true,
    "birthDate": "1976-05-30",
    "connectorId": "e3306678-a53a-4964-9040-1c96f36dda72",
    "data": {
      "displayName": "Johnny Boy",
      "favoriteColors": [
        "Red",
        "Blue"
      ]
    },
    "email": "example@fusionauth.io",
    "expiry": 1571786483322,
    "firstName": "John",
    "fullName": "John Doe",
    "id": "00000000-0000-0001-0000-000000000000",
    "imageUrl": "http://65.media.tumblr.com/tumblr_l7dbl0MHbU1qz50x3o1_500.png",
    "lastLoginInstant": 1471786483322,
    "lastName": "Doe",
    "middleName": "William",
    "mobilePhone": "303-555-1234",
    "passwordChangeRequired": false,
    "passwordLastUpdateInstant": 1471786483322,
    "preferredLanguages": [
      "en",
      "fr"
    ],
    "registrations": [
      {
        "applicationId": "10000000-0000-0002-0000-000000000001",
        "data": {
          "displayName": "Johnny",
          "favoriteSports": [
            "Football",
            "Basketball"
          ]
        },
        "id": "00000000-0000-0002-0000-000000000000",
        "insertInstant": 1446064706250,
        "lastLoginInstant": 1456064601291,
        "preferredLanguages": [
          "en",
          "fr"
        ],
        "roles": [
          "user",
          "community_helper"
        ],
        "username": "johnny123",
        "usernameStatus": "ACTIVE",
        "verified": true,
        "verifiedInstant": 1698772159415
      }
    ],
    "timezone": "America/Denver",
    "tenantId": "f24aca2b-ce4a-4dad-951a-c9d690e71415",
    "twoFactor": {
      "methods": [
        {
          "authenticator": {
            "algorithm": "HmacSHA1",
            "codeLength": 6,
            "timeStep": 30
          },
          "id": "35VW",
          "method": "authenticator"
        },
        {
          "id": "V7SH",
          "method": "sms",
          "mobilePhone": "555-555-5555"
        },
        {
          "email": "example@fusionauth.io",
          "id": "7K2G",
          "method": "email"
        }
      ]
    },
    "usernameStatus": "ACTIVE",
    "username": "johnny123",
    "verified": true,
    "verifiedInstant": 1698772159415
  }
}

Complete a WebAuthn Passkey Assertion

This API is used to validate a WebAuthn authentication ceremony by providing the values returned from the WebAuthn JavaScript API call, but it does not authenticate the user. This API can be used to confirm that a user has access to a particular passkey without authenticating them.

Request

Assert a WebAuthn Authentication Ceremony

POST /api/webauthn/assert

Request Headers

X-FusionAuth-TenantIdString

The unique Id of the tenant used to scope this API request.

See Making an API request using a Tenant Id for additional information.

Request Body

credential.clientExtensionResultsObject

The results for WebAuthn extensions requested during authentication. FusionAuth does not currently support any WebAuthn authentication extensions.

credential.idStringrequired

A base64url-encoded version of the credential Id used by the authenticator for this ceremony.

credential.rpIdString

If the tenant configuration overrides the Relying Party Id, this parameter should match tenant.webAuthnConfiguration.relyingPartyId , otherwise the value should be omitted from the request object.

credential.response.authenticatorDataStringrequired

credential.response.clientDataJSONStringrequired

credential.response.signatureStringrequired

credential.response.userHandleString

credential.typeStringrequired

The credential type of the passkey. The only value supported by WebAuthn is public-key.

originStringrequired

The browser request origin during the authentication ceremony. For example, example.com.

rpIdStringrequired

twoFactorTrustIdString

The Multi-Factor Trust identifier returned by the Multi-Factor Login API response. This value may be provided to bypass the Multi-Factor challenge when a User has Multi-Factor enabled.

Example Request JSON

{
  "credential": {
    "id": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "response": {
      "authenticatorData": "mPsv4VW-wth0V9gzsxWRFn-1SyC9gM4-QC4ptMFDNhUFAAAAKQ==",
      "clientDataJSON": "eyJjaGFsbGVuZ2UiOiJTeTYzQldla285blFsYzVOQmVWcE1BWjFtQ0hvdzBXUXVFeDRJU2xuQzR3IiwiY3Jvc3NPcmlnaW4iOmZhbHNlLCJvcmlnaW4iOiJodHRwczovL2Z1c2lvbmF1dGguaW8iLCJ0eXBlIjoid2ViYXV0aG4uZ2V0In0=",
      "signature": "MEUCIQDUwlDp9aNcYQmvpVGLJ35H8lRWjWsfjVsfPf_5HhY3GwIgahBhISBxv82ZS4ll8TZiJp5bIN2CGx_-VjUymfzKqGA=",
      "userHandle": "NzAzZmUyZDItMmQzOS00Y2I3LWI3NmQtMGI5OTE4ZWQyNDU3"
    },
    "type": "public-key"
  },
  "origin": "https://auth.piedpiper.com",
  "rpId": "piedpiper.com"
}

Response

The response for this API contains the WebAuthn passkey used to complete the assertion.

Response Codes

Code	Description
200	The request was successful. The response will contain a JSON body.
400	The request was invalid and/or malformed. The response will contain an Errors JSON Object with the specific errors. This status will also be returned if a paid FusionAuth license is required and is not present.
500	There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty.
503	The search index is not available or encountered an exception so the request cannot be completed. The response will contain a JSON body.

Response Body

credential.algorithmLong

The identifier for the signing algorithm used with the passkey. These values are defined by the IANA COSE Algorithms registry. FusionAuth supports a subset of these algorithms.

Supported algorithms

Name	Value	Description
RS256	-257	RSASSA-PKCS1-v1_5 using SHA-256
RS384	-258	RSASSA-PKCS1-v1_5 using SHA-384
RS512	-259	RSASSA-PKCS1-v1_5 using SHA-512
PS256	-37	RSASSA-PSS w/ SHA-256
PS384	-38	RSASSA-PSS w/ SHA-384
PS512	-39	RSASSA-PSS w/ SHA-512
ES256	-7	ECDSA w/ SHA-256
ES384	-35	ECDSA w/ SHA-384
ES512	-36	ECDSA w/ SHA-512

credential.attestationTypeString

The type of attestation provided when the passkey was registered. Passkeys registered in FusionAuth will have a value of none. Imported passkeys may have another value.

credential.authenticatorSupportsUserVerificationBoolean

Indicates whether this authenticator supports user verification. User verification ensures that the user is authorized to use the authenticator.

This value is currently determined by whether user verification occurred during the registration of this passkey rather than by other means, such as examining FIDO authenticator metadata.

credential.credentialIdString

credential.dataObject

An object that can hold any information about the passkey that should be persisted.

credential.discoverableBoolean

credential.displayNameString

The display name for the passkey selected during registration. This value should have been selected by the user.

credential.idUUID

The unique identifier for this passkey.

credential.insertInstantLong

The instant that the passkey was added to the FusionAuth database.

credential.lastUseInstantLong

The instant that the passkey was last used to complete a WebAuthn ceremony.

credential.nameString

A unique name meant to disambiguate passkeys with the same credential.displayName .

credential.publicKeyString

The passkey’s public key, encoded in PEM format.

credential.relyingPartyIdString

The Relying Party Id used at the time the passkey was registered.

credential.signCountInteger

A signature counter for the passkey. The signature count can be used by a Relying Party to identify a cloned or malfunctioning authenticator.

credential.tenantIdUUID

The Id of the tenant to which this passkey belongs.

credential.transportsArray<String>

A list of transport types supported by the authenticator that generated the passkey. This value is used as a hint to help identify eligible authenticators during a WebAuthn ceremony.

internal - the authenticator is integrated with the client device
usb - the authenticator can be contacted over USB
nfc - the authenticator can be contacted over Near Field Communication (NFC)
ble - the authenticator can be contacted over Bluetooth Smart (Bluetooth Low Energy, or BLE)
cable - “cloud-assisted” BLE. This transport is used for Android devices acting as an authenticator connected to the computer over Bluetooth
hybrid - replacement for the cable transport

credential.userAgentString

The user agent at the time the passkey was registered. This can be useful for troubleshooting purposes.

credential.userIdUUID

The Id of the user that this passkey belongs to.

Example Response JSON

{
  "credential": {
    "algorithm": -7,
    "attestationType": "none",
    "authenticatorSupportsUserVerification": true,
    "credentialId": "HdN9wqP9mqOonacmiM2gIjASFYg",
    "data": {},
    "displayName": "Chrome Touch ID",
    "name": "richard@fusionauth.io",
    "id": "c664318a-2384-4c35-9475-9a200e1d3b72",
    "insertInstant": 1668011701792,
    "discoverable": false,
    "lastUseInstant": 1668021630599,
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEz9DI9AQfZn1aDJG5sw3Ckl7SoQ7E\nLPElDoJMijphvVigTcNMTc8H9Xptl8B20QHMOXGTzaUxLGNY1c8yhw9VVA==\n-----END PUBLIC KEY-----",
    "relyingPartyId": "piedpiper.com",
    "signCount": 41,
    "tenantId": "30663132-6464-6665-3032-326466613934",
    "transports": [
      "internal"
    ],
    "userId": "703fe2d2-2d39-4cb7-b76d-0b9918ed2457"
  }
}

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