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 read-only 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 byteLength of at least 37 bytes, which contains the data structure explained in Authenticator data.
Examples
See Retrieving a public key credential for a detailed example.
Specifications
| Specification |
|---|
| Web Authentication: An API for accessing Public Key Credentials - Level 3 # dom-authenticatorassertionresponse-authenticatordata |