AuthenticatorAssertionResponse: authenticatorData property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The authenticatorData property of the AuthenticatorAssertionResponse interface returns an ArrayBuffer containing information from the authenticator such as the Relying Party ID Hash (rpIdHash), a signature counter, test of user presence, user verification flags, and any extensions processed by the authenticator.
Value
An ArrayBuffer with a ArrayBuffer.byteLength of at least 37 bytes, which contains the data structure explained in Authenticator data.
Examples
See User login using the WebAuthn API for a detailed example.
Specifications
| Specification |
|---|
| Web Authentication: An API for accessing Public Key Credentials - Level 3 # dom-authenticatorassertionresponse-authenticatordata |
Browser compatibility
BCD tables only load in the browser