PublicKeyCredential: rawId property

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

The rawId read-only property of the PublicKeyCredential interface is an ArrayBuffer object containing the identifier of the credentials.

The property is a base64url encoded version of this identifier.

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


A ArrayBuffer containing the identifier of the credentials. This identifier is expected to be globally unique and is appointed for the current PublicKeyCredential and its associated AuthenticatorAssertionResponse.


const options = {
  challenge: new Uint8Array(26) /* from the server */,
  rp: {
    name: "Example CORP",
    id: "",
  user: {
    id: new Uint8Array(26) /* To be changed for each user */,
    name: "",
    displayName: "Carina Anand",
  pubKeyCredParams: [
      type: "public-key",
      alg: -7,

  .create({ publicKey: options })
  .then((pubKeyCredential) => {
    const rawId = pubKeyCredential.rawId;
    // Do something with rawId
  .catch((err) => {
    // Deal with any error


Web Authentication: An API for accessing Public Key Credentials - Level 3
# ref-for-dom-publickeycredential-rawid

Browser compatibility

BCD tables only load in the browser