Authenticate Using Facebook Login with JavaScript

You can let your users authenticate with Firebase using their Facebook accounts by integrating Facebook Login into your app. You can integrate Facebook Login either by using the Firebase SDK to carry out the sign-in flow, or by carrying out the Facebook Login flow manually and passing the resulting access token to Firebase.

Before you begin

  1. Add Firebase to your JavaScript project.
  2. On the Facebook for Developers site, get the App ID and an App Secret for your app.
  3. Enable Facebook Login:
    1. In the Firebase console, open the Auth section.
    2. On the Sign in method tab, enable the Facebook sign-in method and specify the App ID and App Secret you got from Facebook.
    3. Then, make sure your OAuth redirect URI (e.g. my-app-12345.firebaseapp.com/__/auth/handler) is listed as one of your OAuth redirect URIs in your Facebook app's settings page on the Facebook for Developers site in the Product Settings > Facebook Login config.

Handle the sign-in flow with the Firebase SDK

If you are building a web app, the easiest way to authenticate your users with Firebase using their Facebook accounts is to handle the sign-in flow with the Firebase JavaScript SDK. (If you want to authenticate a user in Node.js or other non-browser environment, you must handle the sign-in flow manually.)

To handle the sign-in flow with the Firebase JavaScript SDK, follow these steps:

  1. Create an instance of the Facebook provider object: 
    var provider = new firebase.auth.FacebookAuthProvider();
  2. Optional: Specify additional OAuth 2.0 scopes that you want to request from the authentication provider. To add a scope, call addScope. For example: 
    provider.addScope('user_birthday');
    See the authentication provider documentation.
  3. Optional: Specify additional custom OAuth provider parameters that you want to send with the OAuth request. To add a custom parameter, call setCustomParameters on the initialized provider with an object containing the key as specified by the OAuth provider documentation and the corresponding value. For example: 
    provider.setCustomParameters({
  'display': 'popup'
});
    Reserved required OAuth parameters are not allowed and will be ignored. See the authentication provider reference for more details.
  4. Authenticate with Firebase using the Facebook provider object. You can prompt your users to sign in with their Facebook accounts either by opening a pop-up window or by redirecting to the sign-in page. The redirect method is preferred on mobile devices.
    • To sign in with a pop-up window, call signInWithPopup: 
      firebase.auth().signInWithPopup(provider).then(function(result) {
  // This gives you a Facebook Access Token. You can use it to access the Facebook API.
  var token = result.credential.accessToken;
  // The signed-in user info.
  var user = result.user;
  // ...
}).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // The email of the user's account used.
  var email = error.email;
  // The firebase.auth.AuthCredential type that was used.
  var credential = error.credential;
  // ...
});
      Also notice that you can retrieve the Facebook provider's OAuth token which can be used to fetch additional data using the Facebook APIs.

      This is also where you can catch and handle errors. For a list of error codes have a look at the Auth Reference Docs.

    • To sign in by redirecting to the sign-in page, call signInWithRedirect: 
      firebase.auth().signInWithRedirect(provider);
      Then, you can also retrieve the Facebook provider's OAuth token by calling getRedirectResult when your page loads: 
      firebase.auth().getRedirectResult().then(function(result) {
  if (result.credential) {
    // This gives you a Facebook Access Token. You can use it to access the Facebook API.
    var token = result.credential.accessToken;
    // ...
  }
  // The signed-in user info.
  var user = result.user;
}).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // The email of the user's account used.
  var email = error.email;
  // The firebase.auth.AuthCredential type that was used.
  var credential = error.credential;
  // ...
});
      This is also where you can catch and handle errors. For a list of error codes have a look at the Auth Reference Docs.

Next steps

After a user signs in for the first time, a new user account is created and linked to the credentials—that is, the user name and password, or auth provider information—the user signed in with. This new account is stored as part of your Firebase project, and can be used to identify a user across every app in your project, regardless of how the user signs in.

  • In your apps, the recommended way to know the auth status of your user is to set an observer on the Auth object. You can then get the user's basic profile information from the User object. See Manage Users.

  • In your Firebase Realtime Database and Firebase Storage Security Rules, you can get the signed-in user's unique user ID from the auth variable, and use it to control what data a user can access.

You can allow users to sign in to your app using multiple authentication providers by linking auth provider credentials to an existing user account.

To sign out a user, call signOut:

firebase.auth().signOut().then(function() {
  // Sign-out successful.
}, function(error) {
  // An error happened.
});

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