Firebase Detecting if user exists

Question

How Can I Check user exists in Firebase auth in Signup Button via react native?

This is my Login Page Code:

export de         


        

Answer 1

For me fetchSignInMethodsForEmail() only works with an email that is registered with email/password and not working for emails registered with Apple, LinkedIn or other providers.

For solution to this, I came up with following work around:

auth().signInWithEmailAndPassword(email, 'some-random-password')  // Password should be really long to avoid actually logging in :)
.then((response) => {
    // TODO : Avoid this block
})
.catch((error) => {
    if(error.code === 'auth/wrong-password'){
        // TODO : If here then it means account already exists...
    }

    if(error.code === 'auth/user-not-found'){
        // TODO : If here then you guessed it... you can create a new account.
    }
})

I'm sure there is a proper solution for this and I will update this answer when I find it.

Hope this will help someone