Build a Social Auth App with Expo React Native

This tutorial demonstrates how to build a React Native app with Expo that implements social authentication. The app showcases a complete authentication flow with protected navigation using:

Supabase Database - a Postgres database for storing your user data with Row Level Security to ensure data is protected and users can only access their own information.
Supabase Auth - enables users to log in through social authentication providers (Apple and Google).

If you get stuck while working through this guide, refer to the full example on GitHub.

Project setup

Before you start building you need to set up the Database and API. You can do this by starting a new Project in Supabase and then creating a "schema" inside the database.

Create a project

Create a new project in the Supabase Dashboard.
Enter your project details.
Wait for the new database to launch.

Set up the database schema

Now set up the database schema. You can use the "User Management Starter" quickstart in the SQL Editor, or you can copy/paste the SQL from below and run it.

Go to the SQL Editor page in the Dashboard.
Click User Management Starter under the Community > Quickstarts tab.
Click Run.

You can pull the database schema down to your local project by running the db pull command. Read the local development docs for detailed instructions.

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supabase link --project-ref <project-id># You can get <project-id> from your project's dashboard URL: https://supabase.com/dashboard/project/<project-id>supabase db pull

Get API details

Now that you've created some database tables, you are ready to insert data using the auto-generated API.

To do this, you need to get the Project URL and key. Get the URL from the API settings section of a project and the key from the the API Keys section of a project's Settings page.

Changes to API keys

Supabase is changing the way keys work to improve project security and developer experience. You can read the full announcement, but in the transition period, you can use both the current anon and service_role keys and the new publishable key with the form sb_publishable_xxx which will replace the older keys.

To get the key values, open the API Keys section of a project's Settings page and do the following:

For legacy keys, copy the anon key for client-side operations and the service_role key for server-side operations from the Legacy API Keys tab.
For new keys, open the API Keys tab, if you don't have a publishable key already, click Create new API Keys, and copy the value from the Publishable key section.

Building the app

Start by building the React Native app from scratch.

Initialize a React Native app

Use Expo to initialize an app called expo-social-auth with the standard template:

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npx create-expo-app@latestcd expo-social-auth

Install the additional dependencies:

supabase-js
@react-native-async-storage/async-storage - A key-value store for React Native.
expo-secure-store - Provides a way to securely store key-value pairs locally on the device.
expo-splash-screen - Provides a way to programmatically manage the splash screen.

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npx expo install @supabase/supabase-js @react-native-async-storage/async-storage expo-secure-store expo-splash-screen

Now, create a helper file to initialize the Supabase client for both web and React Native platforms using platform-specific storage adapters: Expo SecureStore for mobile and AsyncStorage for web.

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import AsyncStorage from '@react-native-async-storage/async-storage';import { createClient } from '@supabase/supabase-js';import 'react-native-url-polyfill/auto';const ExpoWebSecureStoreAdapter = {  getItem: (key: string) => {    console.debug("getItem", { key })    return AsyncStorage.getItem(key)  },  setItem: (key: string, value: string) => {    return AsyncStorage.setItem(key, value)  },  removeItem: (key: string) => {    return AsyncStorage.removeItem(key)  },};export const supabase = createClient(  process.env.EXPO_PUBLIC_SUPABASE_URL ?? '',  process.env.EXPO_PUBLIC_SUPABASE_ANON_KEY ?? '',  {    auth: {      storage: ExpoWebSecureStoreAdapter,      autoRefreshToken: true,      persistSession: true,      detectSessionInUrl: false,    },  },);

Set up environment variables

You need the API URL and the anon key copied earlier. These variables are safe to expose in your Expo app since Supabase has Row Level Security enabled on your database.

Create a .env file containing these variables:

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EXPO_PUBLIC_SUPABASE_URL=YOUR_SUPABASE_URLEXPO_PUBLIC_SUPABASE_ANON_KEY=YOUR_SUPABASE_ANON_KEY

Next, you need to protect app navigation to prevent unauthenticated users from accessing protected routes. Use the Expo SplashScreen to display a loading screen while fetching the user profile and verifying authentication status.

Create the `AuthContext`

Create a React context to manage the authentication session, making it accessible from any component:

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import { Session } from '@supabase/supabase-js'import { createContext, useContext } from 'react'export type AuthData = {  session?: Session | null  profile?: any | null  isLoading: boolean  isLoggedIn: boolean}export const AuthContext = createContext<AuthData>({  session: undefined,  profile: undefined,  isLoading: true,  isLoggedIn: false,})export const useAuthContext = () => useContext(AuthContext)

Create the `AuthProvider`

Next, create a provider component to manage the authentication session throughout the app:

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import { AuthContext } from '@/hooks/use-auth-context'import { supabase } from '@/lib/supabase'import type { Session } from '@supabase/supabase-js'import { PropsWithChildren, useEffect, useState } from 'react'export default function AuthProvider({ children }: PropsWithChildren) {  const [session, setSession] = useState<Session | undefined | null>()  const [profile, setProfile] = useState<any>()  const [isLoading, setIsLoading] = useState<boolean>(true)  // Fetch the session once, and subscribe to auth state changes  useEffect(() => {    const fetchSession = async () => {      setIsLoading(true)      const {        data: { session },        error,      } = await supabase.auth.getSession()      if (error) {        console.error('Error fetching session:', error)      }      setSession(session)      setIsLoading(false)    }    fetchSession()    const {      data: { subscription },    } = supabase.auth.onAuthStateChange((_event, session) => {      console.log('Auth state changed:', { event: _event, session })      setSession(session)    })    // Cleanup subscription on unmount    return () => {      subscription.unsubscribe()    }  }, [])  // Fetch the profile when the session changes  useEffect(() => {    const fetchProfile = async () => {      setIsLoading(true)      if (session) {        const { data } = await supabase          .from('profiles')          .select('*')          .eq('id', session.user.id)          .single()        setProfile(data)      } else {        setProfile(null)      }      setIsLoading(false)    }    fetchProfile()  }, [session])  return (    <AuthContext.Provider      value={{        session,        isLoading,        profile,        isLoggedIn: session != undefined,      }}    >      {children}    </AuthContext.Provider>  )}

Create the `SplashScreenController`

Create a SplashScreenController component to display the Expo SplashScreen while the authentication session is loading:

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import { useAuthContext } from '@/hooks/use-auth-context'import { SplashScreen } from 'expo-router'SplashScreen.preventAutoHideAsync()export function SplashScreenController() {  const { isLoading } = useAuthContext()  if (!isLoading) {    SplashScreen.hideAsync()  }  return null}

Create a logout component

Create a logout button component to handle user sign-out:

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import { supabase } from '@/lib/supabase'import React from 'react'import { Button } from 'react-native'async function onSignOutButtonPress() {  const { error } = await supabase.auth.signOut()  if (error) {    console.error('Error signing out:', error)  }}export default function SignOutButton() {  return <Button title="Sign out" onPress={onSignOutButtonPress} />}

And add it to the app/(tabs)/index.tsx file used to display the user profile data and the logout button:

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import { Image } from 'expo-image'import { StyleSheet } from 'react-native'import { HelloWave } from '@/components/hello-wave'import ParallaxScrollView from '@/components/parallax-scroll-view'import { ThemedText } from '@/components/themed-text'import { ThemedView } from '@/components/themed-view'import SignOutButton from '@/components/social-auth-buttons/sign-out-button'import { useAuthContext } from '@/hooks/use-auth-context'export default function HomeScreen() {  const { profile } = useAuthContext()  return (    <ParallaxScrollView      headerBackgroundColor={{ light: '#A1CEDC', dark: '#1D3D47' }}      headerImage={        <Image          source={require('@/assets/images/partial-react-logo.png')}          style={styles.reactLogo}        />      }    >      <ThemedView style={styles.titleContainer}>        <ThemedText type="title">Welcome!</ThemedText>        <HelloWave />      </ThemedView>      <ThemedView style={styles.stepContainer}>        <ThemedText type="subtitle">Username</ThemedText>        <ThemedText>{profile?.username}</ThemedText>        <ThemedText type="subtitle">Full name</ThemedText>        <ThemedText>{profile?.full_name}</ThemedText>      </ThemedView>      <SignOutButton />    </ParallaxScrollView>  )}const styles = StyleSheet.create({  titleContainer: {    flexDirection: 'row',    alignItems: 'center',    gap: 8,  },  stepContainer: {    gap: 8,    marginBottom: 8,  },  reactLogo: {    height: 178,    width: 290,    bottom: 0,    left: 0,    position: 'absolute',  },})

Next, create a basic login screen component:

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import { Link, Stack } from 'expo-router'import { StyleSheet } from 'react-native'import { ThemedText } from '@/components/themed-text'import { ThemedView } from '@/components/themed-view'export default function LoginScreen() {  return (    <>      <Stack.Screen options={{ title: 'Login' }} />      <ThemedView style={styles.container}>        <ThemedText type="title">Login</ThemedText>        <Link href="/" style={styles.link}>          <ThemedText type="link">Try to navigate to home screen!</ThemedText>        </Link>      </ThemedView>    </>  )}const styles = StyleSheet.create({  container: {    flex: 1,    alignItems: 'center',    justifyContent: 'center',    padding: 20,  },  link: {    marginTop: 15,    paddingVertical: 15,  },})

Implement protected routes

Wrap the navigation with the AuthProvider and SplashScreenController.

Using Expo Router's protected routes, you can secure navigation:

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import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native'import { useFonts } from 'expo-font'import { Stack } from 'expo-router'import { StatusBar } from 'expo-status-bar'import 'react-native-reanimated'import { SplashScreenController } from '@/components/splash-screen-controller'import { useAuthContext } from '@/hooks/use-auth-context'import { useColorScheme } from '@/hooks/use-color-scheme'import AuthProvider from '@/providers/auth-provider'// Separate RootNavigator so we can access the AuthContextfunction RootNavigator() {  const { isLoggedIn } = useAuthContext()  return (    <Stack>      <Stack.Protected guard={isLoggedIn}>        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />      </Stack.Protected>      <Stack.Protected guard={!isLoggedIn}>        <Stack.Screen name="login" options={{ headerShown: false }} />      </Stack.Protected>      <Stack.Screen name="+not-found" />    </Stack>  )}export default function RootLayout() {  const colorScheme = useColorScheme()  const [loaded] = useFonts({    SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),  })  if (!loaded) {    // Async font loading only occurs in development.    return null  }  return (    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>      <AuthProvider>        <SplashScreenController />        <RootNavigator />        <StatusBar style="auto" />      </AuthProvider>    </ThemeProvider>  )}

You can now test the app by running:

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npx expo prebuildnpx expo start --clear

Verify that the app works as expected. The splash screen displays while fetching the user profile, and the login page appears even when attempting to navigate to the home screen using the Link button.

By default Supabase Auth requires email verification before a session is created for the user. To support email verification you need to implement deep link handling!

While testing, you can disable email confirmation in your project's email auth provider settings.

Now integrate social authentication with Supabase Auth, starting with Apple authentication. If you only need to implement Google authentication, you can skip to the Google authentication section.

Apple authentication

Start by adding the button inside the login screen:

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...import AppleSignInButton from '@/components/social-auth-buttons/apple/apple-sign-in-button';...export default function LoginScreen() {  return (    <>      <Stack.Screen options={{ title: 'Login' }} />      <ThemedView style={styles.container}>        ...        <AppleSignInButton />        ...      </ThemedView>    </>  );}...

For Apple authentication, you can choose between:

Invertase's React Native Apple Authentication library - that supports iOS, Android
react-apple-signin-auth - that supports Web, also suggested by Invertase
Expo's AppleAuthentication library - that supports iOS only

For either option, you need to obtain a Service ID from the Apple Developer Console.

To enable Apple sign-up on Android and Web, you also need to register the tunnelled URL (e.g., https://arnrer1-anonymous-8081.exp.direct) obtained by running:

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npx expo start --tunnel

And add it to the Redirect URLs field in your Supabase dashboard Authentication configuration.

For more information, follow the Supabase Login with Apple guide.

Prerequisites

Before proceeding, ensure you have followed the Invertase prerequisites documented in the Invertase Initial Setup Guide and the Invertase Android Setup Guide.

You need to add two new environment variables to the .env file:

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EXPO_PUBLIC_APPLE_AUTH_SERVICE_ID="YOUR_APPLE_AUTH_SERVICE_ID"EXPO_PUBLIC_APPLE_AUTH_REDIRECT_URI="YOUR_APPLE_AUTH_REDIRECT_URI"

iOS

Install the @invertase/react-native-apple-authentication library:

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npx expo install @invertase/react-native-apple-authentication

Then create the iOS specific button component AppleSignInButton:

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import { supabase } from '@/lib/supabase';import { AppleButton, appleAuth } from '@invertase/react-native-apple-authentication';import type { SignInWithIdTokenCredentials } from '@supabase/supabase-js';import { router } from 'expo-router';import { Platform } from 'react-native';async function onAppleButtonPress() {  // Performs login request  const appleAuthRequestResponse = await appleAuth.performRequest({    requestedOperation: appleAuth.Operation.LOGIN,    // Note: it appears putting FULL_NAME first is important, see issue #293    requestedScopes: [appleAuth.Scope.FULL_NAME, appleAuth.Scope.EMAIL],  });  // Get the current authentication state for user  // Note: This method must be tested on a real device. On the iOS simulator it always throws an error.  const credentialState = await appleAuth.getCredentialStateForUser(appleAuthRequestResponse.user);  console.log('Apple sign in successful:', { credentialState, appleAuthRequestResponse });  if (credentialState === appleAuth.State.AUTHORIZED && appleAuthRequestResponse.identityToken && appleAuthRequestResponse.authorizationCode) {    const signInWithIdTokenCredentials: SignInWithIdTokenCredentials = {      provider: 'apple',      token: appleAuthRequestResponse.identityToken,      nonce: appleAuthRequestResponse.nonce,      access_token: appleAuthRequestResponse.authorizationCode,    };    const { data, error } = await supabase.auth.signInWithIdToken(signInWithIdTokenCredentials);    if (error) {      console.error('Error signing in with Apple:', error);    }    if (data) {      console.log('Apple sign in successful:', data);      router.navigate('/(tabs)/explore');    }  }}export default function AppleSignInButton() {  if (Platform.OS !== 'ios') { return <></>; }  return <AppleButton    buttonStyle={AppleButton.Style.BLACK}    buttonType={AppleButton.Type.SIGN_IN}    style={{ width: 160, height: 45 }}    onPress={() => onAppleButtonPress()}  />;}

To test functionality on the simulator, remove the getCredentialStateForUser check:

Enable the Apple authentication capability in iOS:

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{  "expo": {    ...    "ios": {      ...      "usesAppleSignIn": true      ...    },    ...  }}

Add the capabilities to the Info.plist file by following the Expo documentation.

Before testing the app, if you've already built the iOS app, clean the project artifacts:

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npx react-native-clean-project clean-project-auto

If issues persist, try completely cleaning the cache, as reported by many users in this closed issue.

Finally, update the iOS project by installing the Pod library and running the Expo prebuild command:

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cd iospod installcd ..npx expo prebuild

Now test the application on a physical device:

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npx expo run:ios --no-build-cache --device

You should see the login screen with the Apple authentication button.

If you get stuck while working through this guide, refer to the full Invertase example on GitHub.

Android

Install the required libraries:

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npx expo install @invertase/react-native-apple-authentication react-native-get-random-values uuid

Next, create the Android-specific AppleSignInButton component:

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import { supabase } from '@/lib/supabase';import { appleAuthAndroid, AppleButton } from '@invertase/react-native-apple-authentication';import { SignInWithIdTokenCredentials } from '@supabase/supabase-js';import { Platform } from 'react-native';import 'react-native-get-random-values';import { v4 as uuid } from 'uuid';async function onAppleButtonPress() {  // Generate secure, random values for state and nonce  const rawNonce = uuid();  const state = uuid();  // Configure the request  appleAuthAndroid.configure({    // The Service ID you registered with Apple    clientId: process.env.EXPO_PUBLIC_APPLE_AUTH_SERVICE_ID ?? '',    // Return URL added to your Apple dev console. We intercept this redirect, but it must still match    // the URL you provided to Apple. It can be an empty route on your backend as it's never called.    redirectUri: process.env.EXPO_PUBLIC_APPLE_AUTH_REDIRECT_URI ?? '',    // The type of response requested - code, id_token, or both.    responseType: appleAuthAndroid.ResponseType.ALL,    // The amount of user information requested from Apple.    scope: appleAuthAndroid.Scope.ALL,    // Random nonce value that will be SHA256 hashed before sending to Apple.    nonce: rawNonce,    // Unique state value used to prevent CSRF attacks. A UUID will be generated if nothing is provided.    state,  });  // Open the browser window for user sign in  const credentialState = await appleAuthAndroid.signIn();  console.log('Apple sign in successful:', credentialState);  if (credentialState.id_token && credentialState.code && credentialState.nonce) {    const signInWithIdTokenCredentials: SignInWithIdTokenCredentials = {      provider: 'apple',      token: credentialState.id_token,      nonce: credentialState.nonce,      access_token: credentialState.code,    };    const { data, error } = await supabase.auth.signInWithIdToken(signInWithIdTokenCredentials);    if (error) {      console.error('Error signing in with Apple:', error);    }    if (data) {      console.log('Apple sign in successful:', data);    }  }}export default function AppleSignInButton() {  if (Platform.OS !== 'android' || appleAuthAndroid.isSupported !== true) { return <></> }  return <AppleButton    buttonStyle={AppleButton.Style.BLACK}    buttonType={AppleButton.Type.SIGN_IN}    onPress={() => onAppleButtonPress()}  />;}

You should now be able to test the authentication by running it on a physical device or simulator:

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npx expo run:android --no-build-cache

Google authentication

Start by adding the button to the login screen:

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...import GoogleSignInButton from '@/components/social-auth-buttons/google/google-sign-in-button';...export default function LoginScreen() {  return (    <>      <Stack.Screen options={{ title: 'Login' }} />      <ThemedView style={styles.container}>        ...        <GoogleSignInButton />        ...      </ThemedView>    </>  );}...

For Google authentication, you can choose between the following options:

GN Google Sign In Premium - that supports iOS, Android, and Web by using the latest Google's One Tap sign-in (but it requires a subscription)
@react-oauth/google - that supports Web (so it's not a good option for mobile, but it works)
Relying on the ``signInWithOAuth function of the Supabase Auth - that also supports iOS, Android and Web (useful also to manage any other OAuth provider)

The GN Google Sign In Free doesn't support iOS or Android, as it doesn't allow to pass a custom nonce to the sign-in request.

For either option, you need to obtain a Web Client ID from the Google Cloud Engine, as explained in the Google Sign In guide.

This guide only uses the @react-oauth/google@latest option for the Web, and the signInWithOAuth for the mobile platforms.

Before proceeding, add a new environment variable to the .env file:

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EXPO_PUBLIC_GOOGLE_AUTH_WEB_CLIENT_ID="YOUR_GOOGLE_AUTH_WEB_CLIENT_ID"

Install the @react-oauth/google library:

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npx expo install @react-oauth/google

Enable the expo-web-browser plugin in app.json:

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{  "expo": {    ...    "plugins": {      ...      [        "expo-web-browser",        {          "experimentalLauncherActivity": false        }      ]      ...    },    ...  }}

Then create the iOS specific button component GoogleSignInButton:

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import { supabase } from '@/lib/supabase';import { CredentialResponse, GoogleLogin, GoogleOAuthProvider } from '@react-oauth/google';import { SignInWithIdTokenCredentials } from '@supabase/supabase-js';import { useEffect, useState } from 'react';import 'react-native-get-random-values';export default function GoogleSignInButton() {  // Generate secure, random values for state and nonce  const [nonce, setNonce] = useState('');  const [sha256Nonce, setSha256Nonce] = useState('');  async function onGoogleButtonSuccess(authRequestResponse: CredentialResponse) {    console.debug('Google sign in successful:', { authRequestResponse });    if (authRequestResponse.clientId && authRequestResponse.credential) {      const signInWithIdTokenCredentials: SignInWithIdTokenCredentials = {        provider: 'google',        token: authRequestResponse.credential,        nonce: nonce,      };      const { data, error } = await supabase.auth.signInWithIdToken(signInWithIdTokenCredentials);      if (error) {        console.error('Error signing in with Google:', error);      }      if (data) {        console.log('Google sign in successful:', data);      }    }  }  function onGoogleButtonFailure() {    console.error('Error signing in with Google');  }  useEffect(() => {    function generateNonce(): string {      const array = new Uint32Array(1);      window.crypto.getRandomValues(array);      return array[0].toString();    }    async function generateSha256Nonce(nonce: string): Promise<string> {      const buffer = await window.crypto.subtle.digest('sha-256', new TextEncoder().encode(nonce));      const array = Array.from(new Uint8Array(buffer));      return array.map(b => b.toString(16).padStart(2, '0')).join('');    }    let nonce = generateNonce();    setNonce(nonce);    generateSha256Nonce(nonce)      .then((sha256Nonce) => { setSha256Nonce(sha256Nonce) });  }, []);  return (    <GoogleOAuthProvider      clientId={process.env.EXPO_PUBLIC_GOOGLE_AUTH_WEB_CLIENT_ID ?? ''}      nonce={sha256Nonce}    >      <GoogleLogin        nonce={sha256Nonce}        onSuccess={onGoogleButtonSuccess}        onError={onGoogleButtonFailure}        useOneTap={true}        auto_select={true}      />    </GoogleOAuthProvider>  );}

Test the authentication in your browser using the tunnelled HTTPS URL:

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npx expo start --tunnel

To allow the Google Sign In to work, as you did before for Apple, you need to register the tunnelled URL (e.g., https://arnrer1-anonymous-8081.exp.direct) obtained to the Authorized JavaScript origins list of your Google Cloud Console's OAuth 2.0 Client IDs configuration.

Build a Social Auth App with Expo React Native

Project setup

Create a project

Set up the database schema

Get API details

Changes to API keys

Building the app

Initialize a React Native app

Set up environment variables

Set up protected navigation

Create the `AuthContext`

Create the `AuthProvider`

Create the `SplashScreenController`

Create a logout component

Implement protected routes

Apple authentication

Prerequisites

iOS

Android

Google authentication

Is this helpful?

Build a Social Auth App with Expo React Native

Project setup#

Create a project#

Set up the database schema#

Get API details#

Changes to API keys

Building the app#

Initialize a React Native app#

Set up environment variables#

Set up protected navigation#

Create the AuthContext#

Create the AuthProvider#

Create the SplashScreenController#

Create a logout component#

Create a login screen#

Implement protected routes#

Integrate social authentication#

Apple authentication#

Prerequisites#

iOS#

Android#

Google authentication#

Is this helpful?

Project setup

Create a project

Set up the database schema

Get API details

Building the app

Initialize a React Native app

Set up environment variables

Set up protected navigation

Create the `AuthContext`

Create the `AuthProvider`

Create the `SplashScreenController`

Create a logout component

Create a login screen

Implement protected routes

Integrate social authentication

Apple authentication

Prerequisites

iOS

Android

Google authentication