Facebook

Deprecated. This module will be removed in SDK 46. There will be no replacement that works with the classic build service (expo build) because the classic build service has been superseded by EAS Build. With EAS Build and development builds, you should use react-native-fbsdk-next instead.

expo-facebook provides Facebook integration, such as logging in through Facebook, for React Native apps. Expo exposes a minimal native API since you can access Facebook's Graph API directly through HTTP (using fetch, for example).

Platform Compatibility

Installation

If you're installing this in a bare React Native app, you should also follow these additional installation instructions.

For bare apps, here are links to the iOS Installation Walkthrough and the Android Installation Walkthrough.

Registering your app with Facebook

When following these steps you will find on the Facebook Developer site that there are many fields and steps that you don't actually care about. Just look for the information that we ask you for and you will be OK!

Follow Facebook's developer documentation to register an application with Facebook's API and get an application ID. Take note of this application ID because it will be used as the appId option in your Facebook.logInWithReadPermissionsAsync call.

Then follow these steps based on the platforms you're targeting. This will need to be done from the Facebook developer site.

Expo Go from the Android Play Store will use the Facebook App ID that you provide, however, all Facebook API calls in the Expo Go from the iOS App Store will use Expo's own Facebook App ID. This is due to underlying configuration limitations, but the good news is it means less setup for you! The downside to this is that you can't customize which permissions your app requests from Facebook (like user_photos or user_friends), or integrate Facebook login with other services like Firebase auth. If you need that functionality on iOS, you can build a standalone app. An easy way to test this is to run a simulator build and install the app in your simulator, or use expo-dev-client.

You may have to switch the app from 'development mode' to 'public mode' on the Facebook developer page before other users can log in. This requires adding a privacy policy URL, which can be as simple as a GitHub Gist.

iOS standalone app

Add your app's Bundle ID as a Bundle ID in the app settings page pictured below. An easy way to test that this is set up correctly is to run a simulator build.

Android standalone app

• Build your standalone app for Android.
• Run eas credentials, select the profile that you would like to generate the SHA-1 Fingerprint for, and press return.
• Take the resulting SHA1 Fingerprint and convert it to base64 (for example, using base64.guru). The resulting base64 string is your "Facebook Key Hash".
• Configure the Facebook Key Hash on the Facebook developer page pictured below.

Configuration in app.json/app.config.js

• Add the field facebookScheme with your Facebook login redirect URL scheme found on the Facebook Developer website under "4. Configure Your info.plist." It should look like "fb123456". If you do not do this, Facebook will not be able to redirect to your app after logging in.
• Add the fields facebookAppId and facebookDisplayName, using your Facebook App ID and Facebook Display Name, respectively.
• Optionally, add the following fields:
  • facebookAutoLogAppEventsEnabled, defaults to Facebook's default policy (Only applies to standalone apps)
  • facebookAdvertiserIDCollectionEnabled, defaults to Facebook's default policy (Only applies to standalone apps)

You can also configure expo-facebook using its built-in config plugin if you use config plugins in your project (EAS Build or expo run:[android|ios]). The plugin allows you to configure various properties that cannot be set at runtime and require building a new app binary to take effect.

Example app.json with config plugin

{
  "expo": {
    "plugins": [
      [
        "expo-facebook",
        {
          "userTrackingPermission": false
        }
      ]
    ]
  }
}

Configurable properties

Example

async function logIn() {
  try {
    await Facebook.initializeAsync({
      appId: '<APP_ID>',
    });
    const { type, token, expirationDate, permissions, declinedPermissions } =
      await Facebook.logInWithReadPermissionsAsync({
        permissions: ['public_profile'],
      });
    if (type === 'success') {
      // Get the user's name using Facebook's Graph API
      const response = await fetch(`https://graph.facebook.com/me?access_token=${token}`);
      Alert.alert('Logged in!', `Hi ${(await response.json()).name}!`);
    } else {
      // type === 'cancel'
    }
  } catch ({ message }) {
    alert(`Facebook Login Error: ${message}`);
  }
}

API

import * as Facebook from 'expo-facebook';

Hooks

const [status, requestPermission] = Facebook.usePermissions();

Methods

Interfaces

Types

Enums

Error Codes

ERR_FACEBOOK_UNINITIALIZED

Attempted to use the Facebook SDK before it was initialized. Ensure initializeAsync has successfully resolved before attempting to use the Facebook SDK.

ERR_FACEBOOK_MISCONFIGURED

Failed to initialize the Facebook SDK app because the appId option wasn't provided and the appId couldn't be resolved automatically from the native configuration files.

ERR_FACEBOOK_LOGIN

An error occurred while trying to log in to Facebook.

Guide

You can use the fetch API to get info about the user from the Facebook Graph API. Here are some helper methods you can use to make data access easier.

// Get default info about the currently authenticated user.
async function getUserAsync() {
  const { name } = await requestAsync('me');
  console.log(`Hello ${name} 👋`);
}

// Request data from the Facebook Graph API.
// Learn more https://developers.facebook.com/docs/graph-api/using-graph-api/
async function requestAsync(path: string, token?: string): Promise<any> {
  let resolvedToken = token;
  if (!token) {
    const auth = await Facebook.getAuthenticationCredentialAsync();
    if (!auth) {
      throw new Error(
        'User is not authenticated. Ensure `logInWithReadPermissionsAsync` has successfully resolved before attempting to use the FBSDK Graph API.'
      );
    }
    resolvedToken = auth.token;
  }
  const response = await fetch(
    `https://graph.facebook.com/${path}?access_token=${encodeURIComponent(resolvedToken)}`
  );
  const body = await response.json();
  return body;
}