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

The AuthenticatorAssertionResponse interface of the Web Authentication API is returned by CredentialsContainer.get() when a PublicKeyCredential is passed, and provides proof to a service that it has a key pair and that the authentication request is valid and approved.

This interface inherites from AuthenticatorResponse.

Note: This interface is restricted to top-level contexts. Use from within an <iframe> element will not have any effect.


AuthenticatorAssertionResponse.clientDataJSON Secure contextRead only

The client data for the authentication, such as origin and challenge. The clientDataJSON property is inherited from the AuthenticatorResponse.

AuthenticatorAssertionResponse.authenticatorData Secure contextRead only

An ArrayBuffer containing information from the authenticator such as the Relying Party ID Hash (rpIdHash), a signature counter, test of user presence and user verification flags, and any extensions processed by the authenticator.

AuthenticatorAssertionResponse.signature Secure contextRead only

An assertion signature over AuthenticatorAssertionResponse.authenticatorData and AuthenticatorResponse.clientDataJSON. The assertion signature is created with the private key of keypair that was created during the navigator.credentials.create() call and verified using the public key of that same keypair.

AuthenticatorAssertionResponse.userHandle Secure contextRead only

An ArrayBuffer containing an opaque user identifier.




var options = {
  challenge: new Uint8Array([/* bytes sent from the server */])

navigator.credentials.get({ "publicKey": options })
    .then(function (credentialInfoAssertion) {
    var assertionResponse = credentialInfoAssertion.response;
    // Do something specific with the response

    // send assertion response back to the server
    // to proceed with the control of the credential
}).catch(function (err) {


Web Authentication: An API for accessing Public Key Credentials - Level 3 (Web Authentication)
# iface-authenticatorassertionresponse

Browser compatibility

BCD tables only load in the browser

See also