The AuthenticatorAttestationResponse interface of the Web Authentication API is the result of a WebAuthn credential registration. It contains information about the credential that the server needs to perform WebAuthn assertions, such as its credential ID and public key.

An AuthenticatorAttestationResponse object instance is available in the response property of a PublicKeyCredential object returned by a successful CredentialsContainer.create() call.

This interface inherits from AuthenticatorResponse.

Also inherits properties from its parent, AuthenticatorResponse.

AuthenticatorAttestationResponse.attestationObject Secure context Read only

An ArrayBuffer containing authenticator data and an attestation statement for a new key pair generated by the authenticator.

AuthenticatorResponse.clientDataJSON Secure context Read only

Inherited from AuthenticatorResponse, this property contains the JSON-compatible serialization of the data passed from the browser to the authenticator in order to generate this credential — i.e., when CredentialsContainer.create() is called with a publicKey option. This data contains some information from the options passed into the create() call, and some information controlled by the browser.

AuthenticatorAttestationResponse.getAuthenticatorData() Secure context

Returns an ArrayBuffer containing the authenticator data contained within the AuthenticatorAttestationResponse.attestationObject property.

AuthenticatorAttestationResponse.getPublicKey() Secure context

Returns an ArrayBuffer containing the DER SubjectPublicKeyInfo of the new credential (see Subject Public Key Info), or null if this is not available.

AuthenticatorAttestationResponse.getPublicKeyAlgorithm() Secure context

Returns a number that is equal to a COSE Algorithm Identifier, representing the cryptographic algorithm used for the new credential.

AuthenticatorAttestationResponse.getTransports() Secure context

Returns an array of strings describing which transport methods (e.g., usb, nfc) are believed to be supported with the authenticator. The array may be empty if the information is not available.

See Creating a public key credential using the WebAuthn API for a detailed example.

• AuthenticatorAssertionResponse: the interface for the type of response given when retrieving an existing credential
• AuthenticatorResponse: the parent interface