Use Supabase Auth with React Native

Learn how to use Supabase Auth with React Native

Create a new Supabase project

Launch a new project in the Supabase Dashboard.

Your new database has a table for storing your users. You can see that this table is currently empty by running some SQL in the SQL Editor.

SQL_EDITOR

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select * from auth.users;

Create a React app

Create a React app using the create-expo-app command.

Terminal

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npx create-expo-app -t expo-template-blank-typescript my-app

Install the Supabase client library

Install supabase-js and the required dependencies.

Terminal

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cd my-app && npx expo install @supabase/supabase-js @react-native-async-storage/async-storage @rneui/themed react-native-url-polyfill

Set up your login component

Create a helper file lib/supabase.ts that exports a Supabase client using your Project URL and public API (anon) key.

lib/supabase.ts

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import { AppState, Platform } from 'react-native'import 'react-native-url-polyfill/auto'import AsyncStorage from '@react-native-async-storage/async-storage'import { createClient, processLock } from '@supabase/supabase-js'const supabaseUrl = YOUR_REACT_NATIVE_SUPABASE_URLconst supabaseAnonKey = YOUR_REACT_NATIVE_SUPABASE_ANON_KEYexport const supabase = createClient(supabaseUrl, supabaseAnonKey, {  auth: {    ...(Platform.OS !== "web" ? { storage: AsyncStorage } : {}),    autoRefreshToken: true,    persistSession: true,    detectSessionInUrl: false,    lock: processLock,  },})// Tells Supabase Auth to continuously refresh the session automatically// if the app is in the foreground. When this is added, you will continue// to receive `onAuthStateChange` events with the `TOKEN_REFRESHED` or// `SIGNED_OUT` event if the user's session is terminated. This should// only be registered once.if (Platform.OS !== "web") {  AppState.addEventListener('change', (state) => {    if (state === 'active') {      supabase.auth.startAutoRefresh()    } else {      supabase.auth.stopAutoRefresh()    }  })}

Create a login component

Let's set up a React Native component to manage logins and sign ups.

components/Auth.tsx

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import React, { useState } from 'react'import { Alert, StyleSheet, View } from 'react-native'import { supabase } from '../lib/supabase'import { Button, Input } from '@rneui/themed'export default function Auth() {  const [email, setEmail] = useState('')  const [password, setPassword] = useState('')  const [loading, setLoading] = useState(false)  async function signInWithEmail() {    setLoading(true)    const { error } = await supabase.auth.signInWithPassword({      email: email,      password: password,    })    if (error) Alert.alert(error.message)    setLoading(false)  }  async function signUpWithEmail() {    setLoading(true)    const {      data: { session },      error,    } = await supabase.auth.signUp({      email: email,      password: password,    })    if (error) Alert.alert(error.message)    if (!session) Alert.alert('Please check your inbox for email verification!')    setLoading(false)  }  return (    <View style={styles.container}>      <View style={[styles.verticallySpaced, styles.mt20]}>        <Input          label="Email"          leftIcon={{ type: 'font-awesome', name: 'envelope' }}          onChangeText={(text) => setEmail(text)}          value={email}          placeholder="email@address.com"          autoCapitalize={'none'}        />      </View>      <View style={styles.verticallySpaced}>        <Input          label="Password"          leftIcon={{ type: 'font-awesome', name: 'lock' }}          onChangeText={(text) => setPassword(text)}          value={password}          secureTextEntry={true}          placeholder="Password"          autoCapitalize={'none'}        />      </View>      <View style={[styles.verticallySpaced, styles.mt20]}>        <Button title="Sign in" disabled={loading} onPress={() => signInWithEmail()} />      </View>      <View style={styles.verticallySpaced}>        <Button title="Sign up" disabled={loading} onPress={() => signUpWithEmail()} />      </View>    </View>  )}const styles = StyleSheet.create({  container: {    marginTop: 40,    padding: 12,  },  verticallySpaced: {    paddingTop: 4,    paddingBottom: 4,    alignSelf: 'stretch',  },  mt20: {    marginTop: 20,  },})

Add the Auth component to your app

Add the Auth component to your App.tsx file. If the user is logged in, print the user id to the screen.

App.tsx

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import 'react-native-url-polyfill/auto'import { useState, useEffect } from 'react'import { supabase } from './lib/supabase'import Auth from './components/Auth'import { View, Text } from 'react-native'import { Session } from '@supabase/supabase-js'export default function App() {  const [session, setSession] = useState<Session | null>(null)  useEffect(() => {    supabase.auth.getSession().then(({ data: { session } }) => {      setSession(session)    })    supabase.auth.onAuthStateChange((_event, session) => {      setSession(session)    })  }, [])  return (    <View>      <Auth />      {session && session.user && <Text>{session.user.id}</Text>}    </View>  )}

Start the app

Start the app, and follow the instructions in the terminal.

Terminal

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npm start