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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/PublicKeyCredential below:

PublicKeyCredential - Web APIs | MDN

Baseline Widely available *

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

The PublicKeyCredential interface provides information about a public key / private key pair, which is a credential for logging in to a service using an un-phishable and data-breach resistant asymmetric key pair instead of a password. It inherits from Credential, and is part of the Web Authentication API extension to the Credential Management API.

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

PublicKeyCredential.authenticatorAttachment Read only

A string that indicates the mechanism by which the WebAuthn implementation is attached to the authenticator at the time the associated navigator.credentials.create() or navigator.credentials.get() call completes.

PublicKeyCredential.id Read only

Inherited from Credential and overridden to be the base64url encoding of PublicKeyCredential.rawId.

PublicKeyCredential.rawId Read only

An ArrayBuffer that holds the globally unique identifier for this PublicKeyCredential. This identifier can be used to look up credentials for future calls to navigator.credentials.get().

PublicKeyCredential.response Read only

An instance of an AuthenticatorResponse object. It is either of type AuthenticatorAttestationResponse if the PublicKeyCredential was the results of a navigator.credentials.create() call, or of type AuthenticatorAssertionResponse if the PublicKeyCredential was the result of a navigator.credentials.get() call.

PublicKeyCredential.type Read only

Inherited from Credential. Always set to public-key for PublicKeyCredential instances.

PublicKeyCredential.getClientCapabilities()

Returns a Promise that resolves with an object that can be used to check whether or not particular WebAuthn capabilities and extensions are supported.

PublicKeyCredential.isConditionalMediationAvailable()

Returns a Promise which resolves to true if conditional mediation is available.

PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable()

Returns a Promise which resolves to true if an authenticator bound to the platform is capable of verifying the user.

PublicKeyCredential.parseCreationOptionsFromJSON()

Convenience method for deserializing server-sent credential registration data when registering a user with credentials.

PublicKeyCredential.parseRequestOptionsFromJSON()

Convenience method for deserializing server-sent credential request data when authenticating a (registered) user.

PublicKeyCredential.signalAllAcceptedCredentials()

Signals to the authenticator all of the valid credential IDs that the relying party server still holds for a particular user.

PublicKeyCredential.signalCurrentUserDetails()

Signals to the authenticator that a particular user has updated their user name and/or display name.

PublicKeyCredential.signalUnknownCredential()

Signals to the authenticator that a credential ID was not recognized by the relying party server, for example because it was deleted.

PublicKeyCredential.getClientExtensionResults()

If any extensions were requested, this method will return the results of processing those extensions.

PublicKeyCredential.toJSON()

Convenience method for creating a JSON string representation of a PublicKeyCredential for sending to the server when registering a user with credentials and authenticating a registered user.

Here, we use navigator.credentials.create() to generate a new credential.

const createCredentialOptions = {
  publicKey: {
    challenge: new Uint8Array([
      21, 31, 105 /* 29 more random bytes generated by the server */,
    ]),
    rp: {
      name: "Example CORP",
      id: "login.example.com",
    },
    user: {
      id: new Uint8Array(16),
      name: "canand@example.com",
      displayName: "Carina Anand",
    },
    pubKeyCredParams: [
      {
        type: "public-key",
        alg: -7,
      },
    ],
  },
};

navigator.credentials
  .create(createCredentialOptions)
  .then((newCredentialInfo) => {
    const response = newCredentialInfo.response;
    const clientExtensionsResults =
      newCredentialInfo.getClientExtensionResults();
  })
  .catch((err) => {
    console.error(err);
  });

Here, we fetch an existing credential from an authenticator, using navigator.credentials.get().

const requestCredentialOptions = {
  publicKey: {
    challenge: new Uint8Array([
      /* bytes sent from the server */
    ]),
  },
};

navigator.credentials
  .get(requestCredentialOptions)
  .then((credentialInfoAssertion) => {
    // send assertion response back to the server
    // to proceed with the control of the credential
  })
  .catch((err) => {
    console.error(err);
  });

• The parent interface Credential

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