AuthenticatorAssertionResponse.userHandle

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

The userHandle read-only property of the AuthenticatorAssertionResponse interface is an ArrayBuffer object which is an opaque identifier for the given user. Such an identifier can be used by the relying party's server to link the user account with its corresponding credentials and other data.

The same value may be found on the id property of the options.user object (used for the creation of the PublicKeyCredential instance).

Note: An AuthenticatorAssertionResponse instance is available on PublicKeyCredential.response after calling navigator.credentials.get().

Note: This property may only be used in top-level contexts and will not be available in an <iframe> for example.

Syntax

userHandle = authenticatorAssertionResponse.userHandle

Value

An ArrayBuffer object which is an opaque identifier for the current user. This is not human-readable and does not contain any personally identifying information (e.g. username, e-mail, phone number, etc.)

Examples

var options = {
  challenge: new Uint8Array(26), // will be another value, provided by the relying party server
  timeout: 60000
};

navigator.credentials.get({  publicKey: options })
  .then(function (assertionPKCred) {
    var userHandle = assertionPKCred.response.userHandle;

    // Send response and client extensions to the server so that it can
    // go on with the authentication

}).catch(function (err) {
   console.error(err);
});

Specifications

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

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`userHandle`	67	18	60 Only supports USB U2F tokens.	No	No	13	No	70	60 Only supports USB U2F tokens.	No	13	No