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


_10 select * from auth.users;

Create a React app

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

Terminal


_10npx create-expo-app -t expo-template-blank-typescript my-app

Install the Supabase client library

Install supabase-js and the required dependencies.

Terminal


_10cd 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


_29import { AppState } from 'react-native'
_29import 'react-native-url-polyfill/auto'
_29import AsyncStorage from '@react-native-async-storage/async-storage'
_29import { createClient } from '@supabase/supabase-js'
_29
_29const supabaseUrl = YOUR_REACT_NATIVE_SUPABASE_URL
_29const supabaseAnonKey = YOUR_REACT_NATIVE_SUPABASE_ANON_KEY
_29
_29export const supabase = createClient(supabaseUrl, supabaseAnonKey, {
_29  auth: {
_29    storage: AsyncStorage,
_29    autoRefreshToken: true,
_29    persistSession: true,
_29    detectSessionInUrl: false,
_29  },
_29})
_29
_29// Tells Supabase Auth to continuously refresh the session automatically
_29// if the app is in the foreground. When this is added, you will continue
_29// to receive `onAuthStateChange` events with the `TOKEN_REFRESHED` or
_29// `SIGNED_OUT` event if the user's session is terminated. This should
_29// only be registered once.
_29AppState.addEventListener('change', (state) => {
_29  if (state === 'active') {
_29    supabase.auth.startAutoRefresh()
_29  } else {
_29    supabase.auth.stopAutoRefresh()
_29  }
_29})

Create a login component

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

components/Auth.tsx


_83import React, { useState } from 'react'
_83import { Alert, StyleSheet, View } from 'react-native'
_83import { supabase } from '../lib/supabase'
_83import { Button, Input } from '@rneui/themed'
_83
_83export default function Auth() {
_83  const [email, setEmail] = useState('')
_83  const [password, setPassword] = useState('')
_83  const [loading, setLoading] = useState(false)
_83
_83  async function signInWithEmail() {
_83    setLoading(true)
_83    const { error } = await supabase.auth.signInWithPassword({
_83      email: email,
_83      password: password,
_83    })
_83
_83    if (error) Alert.alert(error.message)
_83    setLoading(false)
_83  }
_83
_83  async function signUpWithEmail() {
_83    setLoading(true)
_83    const {
_83      data: { session },
_83      error,
_83    } = await supabase.auth.signUp({
_83      email: email,
_83      password: password,
_83    })
_83
_83    if (error) Alert.alert(error.message)
_83    if (!session) Alert.alert('Please check your inbox for email verification!')
_83    setLoading(false)
_83  }
_83
_83  return (
_83    <View style={styles.container}>
_83      <View style={[styles.verticallySpaced, styles.mt20]}>
_83        <Input
_83          label="Email"
_83          leftIcon={{ type: 'font-awesome', name: 'envelope' }}
_83          onChangeText={(text) => setEmail(text)}
_83          value={email}
_83          placeholder="email@address.com"
_83          autoCapitalize={'none'}
_83        />
_83      </View>
_83      <View style={styles.verticallySpaced}>
_83        <Input
_83          label="Password"
_83          leftIcon={{ type: 'font-awesome', name: 'lock' }}
_83          onChangeText={(text) => setPassword(text)}
_83          value={password}
_83          secureTextEntry={true}
_83          placeholder="Password"
_83          autoCapitalize={'none'}
_83        />
_83      </View>
_83      <View style={[styles.verticallySpaced, styles.mt20]}>
_83        <Button title="Sign in" disabled={loading} onPress={() => signInWithEmail()} />
_83      </View>
_83      <View style={styles.verticallySpaced}>
_83        <Button title="Sign up" disabled={loading} onPress={() => signUpWithEmail()} />
_83      </View>
_83    </View>
_83  )
_83}
_83
_83const styles = StyleSheet.create({
_83  container: {
_83    marginTop: 40,
_83    padding: 12,
_83  },
_83  verticallySpaced: {
_83    paddingTop: 4,
_83    paddingBottom: 4,
_83    alignSelf: 'stretch',
_83  },
_83  mt20: {
_83    marginTop: 20,
_83  },
_83})

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


_27import 'react-native-url-polyfill/auto'
_27import { useState, useEffect } from 'react'
_27import { supabase } from './lib/supabase'
_27import Auth from './components/Auth'
_27import { View, Text } from 'react-native'
_27import { Session } from '@supabase/supabase-js'
_27
_27export default function App() {
_27  const [session, setSession] = useState<Session | null>(null)
_27
_27  useEffect(() => {
_27    supabase.auth.getSession().then(({ data: { session } }) => {
_27      setSession(session)
_27    })
_27
_27    supabase.auth.onAuthStateChange((_event, session) => {
_27      setSession(session)
_27    })
_27  }, [])
_27
_27  return (
_27    <View>
_27      <Auth />
_27      {session && session.user && <Text>{session.user.id}</Text>}
_27    </View>
_27  )
_27}

Start the app

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

Terminal


_10npm start