React Native - Firebase auth persistence not working

Question

Firebase auth does not persist logged in user and everytime I refresh or reopen app I have to sign in again.

I have tried setting persistence to local and the callba

Answer 1

Make sure you do not restrict the 'Token Service API' in the console, with the API key you are using. I did not add the service to my key, and it logged me out every 3-4 hours, even with the right code suggested above.

Answer 2

You don't need to set persistence. Firebase handles it for you by default. You just need to call this function to check whether user is logged or not:

firebase.auth().onAuthStateChanged((user) => {
      if (user) {
        console.log('user is logged');
      }
});

This will not be triggered only if user has sign out or cleaned app data.

You can find more details in the official docs: https://firebase.google.com/docs/auth/web/manage-users

Hope it helps.

Answer 3

Firebase now recommends to use firestore instead of realtime-database and it manages offline persistence by default. It is clear in its documentation here

You just need to access the user through this code:

if (auth().currentUser !== null) {
      console.log('User is logged in');
      console.log(auth().currentUser.email);
      props.navigation.navigate('Home');
    } else {
      props.navigation.navigate('Login');
}

This code will prop you to home screen if user is logged-in, even when you close the app. To clear the user's credentials, you manually need to sign-out the user using this code.

try {
      auth()
        .signOut()
        .then(props.navigation.navigate('Login'));
    } catch (error) {
      Alert.alert('Error', error.toString());
}

You can also check this simple app (used react hooks in it) for further assistance.