The getAuthenticatorData() method of the AuthenticatorAttestationResponse interface returns an ArrayBuffer containing the authenticator data contained within the AuthenticatorAttestationResponse.attestationObject property.

This is a convenience function, created to allow easy access to the authenticator data without having to write extra parsing code to extract it from the attestationObject.

None.

An ArrayBuffer with a ArrayBuffer.byteLength of at least 37 bytes, which contains the data structure explained in Authenticator data.

This will be equivalent to the authenticator data contained within the AuthenticatorAttestationResponse.attestationObject property.

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