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

CredentialsContainer: create() method - Web APIs

Baseline Widely available *

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

The create() method of the CredentialsContainer interface creates a new credential, which can then be stored and later retrieved using the navigator.credentials.get() method. The retrieved credential can then be used by a website to authenticate a user.

This method supports three different types of credential:

• A password credential, which enables a user to sign in using a password.
• A federated credential, which enables a user to sign in using a federated identity provider.
• A public key credential, which enables a user to sign in with an authenticator such as a biometric reader built into the platform or a removable hardware token.

Note that the Federated Credential Management API (FedCM) supersedes the federated credential type.

options Optional

An object that contains options for the requested new Credentials object. It can contain the following properties:

signal Optional

An AbortSignal object instance that allows an ongoing create() operation to be aborted. An aborted operation may complete normally (generally if the abort was received after the operation finished) or reject with an AbortError DOMException.

Each of the following properties represents a credential type being created. One and only one of them must be specified:

federated Optional

A FederatedCredentialInit object containing requirements for creating a federated identify provider credential.

password Optional

A PasswordCredentialInit object containing requirements for creating a password credential.

publicKey Optional

A PublicKeyCredentialCreationOptions object containing requirements for creating a public key credential. Causes the create() call to request that the user agent creates new credentials via an authenticator — either for registering a new account or for associating a new asymmetric key pair with an existing account.

Note: Usage of create() with the publicKey parameter may be blocked by a publickey-credentials-create Permissions Policy set on your server.

A Promise that resolves with one of the following:

• A FederatedCredential, if the credential type was federated.
• A PasswordCredential, if the credential type was password.
• A PublicKeyCredential, if the credential type was publicKey.

If no credential object can be created, the promise resolves with null.

TypeError

In the case of a PasswordCredential creation request, id, origin, or password were not provided (empty).

NotAllowedError DOMException

Possible causes include:

• Usage was blocked by a publickey-credentials-create Permissions Policy.
• The function is called cross-origin but the iframe's allow attribute does not set an appropriate publickey-credentials-create policy.
• The function is called cross-origin and the <iframe> does not have transient activation.
• An attempt is made to create a discoverable credential (residentKey is set to required in the create() call's PublicKeyCredentialCreationOptions option), but the user does not have a security key that supports discoverable credentials, and cancels the operation.

AbortError DOMException

The operation was aborted.

This example creates a password credential from a PasswordCredentialInit object.

const credInit = {
  id: "1234",
  name: "Serpentina",
  origin: "https://example.org",
  password: "the last visible dog",
};

const makeCredential = document.querySelector("#make-credential");

makeCredential.addEventListener("click", async () => {
  const cred = await navigator.credentials.create({
    password: credInit,
  });
  console.log(cred.name);
  // Serpentina
  console.log(cred.password);
  // the last visible dog
});

This example creates a federated credential from a FederatedCredentialInit object.

const credInit = {
  id: "1234",
  name: "Serpentina",
  origin: "https://example.org",
  protocol: "openidconnect",
  provider: "https://provider.example.org",
};

const makeCredential = document.querySelector("#make-credential");

makeCredential.addEventListener("click", async () => {
  const cred = await navigator.credentials.create({
    federated: credInit,
  });
  console.log(cred.name);
  console.log(cred.provider);
});

This example creates a public key credential from a PublicKeyCredentialCreationOptions object.

const publicKey = {
  challenge: challengeFromServer,
  rp: { id: "acme.com", name: "ACME Corporation" },
  user: {
    id: new Uint8Array([79, 252, 83, 72, 214, 7, 89, 26]),
    name: "jamiedoe",
    displayName: "Jamie Doe",
  },
  pubKeyCredParams: [{ type: "public-key", alg: -7 }],
};

const publicKeyCredential = await navigator.credentials.create({ publicKey });

The create() call, if successful, returns a promise that resolves with a PublicKeyCredential object instance, representing a public key credential that can later be used to authenticate a user via a WebAuthn get() call. Its PublicKeyCredential.response property contains an AuthenticatorAttestationResponse object providing access to several useful pieces of information including the authenticator data, public key, transport mechanisms, and more.

navigator.credentials.create({ publicKey }).then((publicKeyCredential) => {
  const response = publicKeyCredential.response;

  // Access attestationObject ArrayBuffer
  const attestationObj = response.attestationObject;

  // Access client JSON
  const clientJSON = response.clientDataJSON;

  // Return authenticator data ArrayBuffer
  const authenticatorData = response.getAuthenticatorData();

  // Return public key ArrayBuffer
  const pk = response.getPublicKey();

  // Return public key algorithm identifier
  const pkAlgo = response.getPublicKeyAlgorithm();

  // Return permissible transports array
  const transports = response.getTransports();
});

Some of this data will need to be stored on the server for future authentication operations against this credential — for example the public key, the algorithm used, and the permissible transports.

Note: See Creating a key pair and registering a user for more information about how the overall flow works.

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