PhoneAuthProvider class

Provider for generating an PhoneAuthCredential.

PhoneAuthProvider does not work in a Node.js environment.

Signature:

export declare class PhoneAuthProvider 

Constructors

Constructor Modifiers Description
(constructor)(auth) Constructs a new instance of the PhoneAuthProvider class

Properties

Property Modifiers Type Description
PHONE_SIGN_IN_METHOD static 'phone' Always set to SignInMethod.PHONE.
PROVIDER_ID static 'phone' Always set to ProviderId.PHONE.
providerId "phone" Always set to ProviderId.PHONE.

Methods

Method Modifiers Description
credential(verificationId, verificationCode) static Creates a phone auth credential, given the verification ID from PhoneAuthProvider.verifyPhoneNumber() and the code that was sent to the user's mobile device.
credentialFromError(error) static Returns an AuthCredential when passed an error.
credentialFromResult(userCredential) static Generates an AuthCredential from a UserCredential.
verifyPhoneNumber(phoneOptions, applicationVerifier) Starts a phone number authentication flow by sending a verification code to the given phone number.

PhoneAuthProvider.(constructor)

Constructs a new instance of the PhoneAuthProvider class

Signature:

constructor(auth: Auth);

Parameters

Parameter Type Description
auth Auth The Firebase Auth instance in which sign-ins should occur.

PhoneAuthProvider.PHONE_SIGN_IN_METHOD

Always set to SignInMethod.PHONE.

Signature:

static readonly PHONE_SIGN_IN_METHOD: 'phone';

PhoneAuthProvider.PROVIDER_ID

Always set to ProviderId.PHONE.

Signature:

static readonly PROVIDER_ID: 'phone';

PhoneAuthProvider.providerId

Always set to ProviderId.PHONE.

Signature:

readonly providerId: "phone";

PhoneAuthProvider.credential()

Creates a phone auth credential, given the verification ID from PhoneAuthProvider.verifyPhoneNumber() and the code that was sent to the user's mobile device.

Signature:

static credential(verificationId: string, verificationCode: string): PhoneAuthCredential;

Parameters

Parameter Type Description
verificationId string The verification ID returned from PhoneAuthProvider.verifyPhoneNumber().
verificationCode string The verification code sent to the user's mobile device.

Returns:

PhoneAuthCredential

The auth provider credential.

Example 1

const provider = new PhoneAuthProvider(auth);
const verificationId = provider.verifyPhoneNumber(phoneNumber, applicationVerifier);
// Obtain verificationCode from the user.
const authCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
const userCredential = signInWithCredential(auth, authCredential);

Example 2

An alternative flow is provided using the signInWithPhoneNumber method.

const confirmationResult = await signInWithPhoneNumber(auth, phoneNumber, applicationVerifier);
// Obtain verificationCode from the user.
const userCredential = await confirmationResult.confirm(verificationCode);

PhoneAuthProvider.credentialFromError()

Returns an AuthCredential when passed an error.

This method works for errors like auth/account-exists-with-different-credentials. This is useful for recovering when attempting to set a user's phone number but the number in question is already tied to another account. For example, the following code tries to update the current user's phone number, and if that fails, links the user with the account associated with that number:

const provider = new PhoneAuthProvider(auth);
const verificationId = await provider.verifyPhoneNumber(number, verifier);
try {
  const code = ''; // Prompt the user for the verification code
  await updatePhoneNumber(
      auth.currentUser,
      PhoneAuthProvider.credential(verificationId, code));
} catch (e) {
  if ((e as FirebaseError)?.code === 'auth/account-exists-with-different-credential') {
    const cred = PhoneAuthProvider.credentialFromError(e);
    await linkWithCredential(auth.currentUser, cred);
  }
}

// At this point, auth.currentUser.phoneNumber === number.

Signature:

static credentialFromError(error: FirebaseError): AuthCredential | null;

Parameters

Parameter Type Description
error FirebaseError The error to generate a credential from.

Returns:

AuthCredential | null

PhoneAuthProvider.credentialFromResult()

Generates an AuthCredential from a UserCredential.

Signature:

static credentialFromResult(userCredential: UserCredential): AuthCredential | null;

Parameters

Parameter Type Description
userCredential UserCredential The user credential.

Returns:

AuthCredential | null

PhoneAuthProvider.verifyPhoneNumber()

Starts a phone number authentication flow by sending a verification code to the given phone number.

Signature:

verifyPhoneNumber(phoneOptions: PhoneInfoOptions | string, applicationVerifier: ApplicationVerifier): Promise<string>;

Parameters

Parameter Type Description
phoneOptions PhoneInfoOptions | string
applicationVerifier ApplicationVerifier For abuse prevention, this method also requires a ApplicationVerifier. This SDK includes a reCAPTCHA-based implementation, RecaptchaVerifier.

Returns:

Promise<string>

A Promise for a verification ID that can be passed to PhoneAuthProvider.credential() to identify this flow..

Example 1

const provider = new PhoneAuthProvider(auth);
const verificationId = await provider.verifyPhoneNumber(phoneNumber, applicationVerifier);
// Obtain verificationCode from the user.
const authCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
const userCredential = await signInWithCredential(auth, authCredential);

Example 2

An alternative flow is provided using the signInWithPhoneNumber method.

const confirmationResult = signInWithPhoneNumber(auth, phoneNumber, applicationVerifier);
// Obtain verificationCode from the user.
const userCredential = confirmationResult.confirm(verificationCode);

Example

// 'recaptcha-container' is the ID of an element in the DOM.
const applicationVerifier = new RecaptchaVerifier('recaptcha-container');
const provider = new PhoneAuthProvider(auth);
const verificationId = await provider.verifyPhoneNumber('+16505550101', applicationVerifier);
// Obtain the verificationCode from the user.
const phoneCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
const userCredential = await signInWithCredential(auth, phoneCredential);