PublicKeyCredentialCreationOptions.excludeCredentials

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

excludeCredentials, an optional property of the PublicKeyCredentialCreationOptions dictionary, is an Array whose elements are descriptors for the public keys already existing for a given user. This is provided by the relying party's server if it wants to prevent creation of new credentials for an existing user.

Syntax

excludeCredentials = publicKeyCredentialCreationOptions.excludeCredentials

Value

An Array whose elements are objects with the following properties:

type
A string describing type of public-key credential to be created. As of this writing (March 2019), only "public-key" may be used.
id
A BufferSource matching an existing public key credential identifier (PublicKeyCredential.rawId). This identifier is generated during the creation of the PublicKeyCredential instance.
transports Optional
An Array of strings describing the possible transports between the client and the authenticator. The value of the strings may be:
  • "usb": the authenticator can be contacted via a removable USB link
  • "nfc": the authenticator may be used over NFC (Near Field Communication)
  • "ble": the authenticator may be used over BLE (Bluetooth Low Energy)
  • "internal": the authenticator is specifically bound to the client device (cannot be removed).

If the authenticator already contains one of such a public key credential, the client will throw a DOMException or asks the user if they want to create a new credential.

Examples

var publicKey = {
  excludeCredentials: [
    {
      type: "public-key",
      // the id for john.doe@example.com
      id  : new Uint8Array(26) /* this actually is given by the server */
    },
    {
      type: "public-key",
      // the id for john-doe@example.com
      id : new Uint8Array(26) /* another id */
    }
  ],
  challenge: new Uint8Array(26) /* this actually is given from the server */,
  rp: {
    name: "Example CORP",
    id  : "login.example.com"
  },
  user: {
    id: new Uint8Array(26), /* To be changed for each user */
    name: "jdoe@example.com",
    displayName: "John Doe",
  },
  pubKeyCredParams: [ {
    type: "public-key",
    alg: -7 } ]
};

navigator.credentials.create({ publicKey })
  .then(function (newCredentialInfo) {
    // send attestation response and client extensions
    // to the server to proceed with the registration
    // of the credential
  }).catch(function (err) {
     console.error(err);
  });

Specifications

Specification Status Comment
Web Authentication: An API for accessing Public Key Credentials Level 1
The definition of 'excludeCredentials' in that specification.
Recommendation Initial definition.

Browser compatibility

BCD tables only load in the browser