How to find out if an email is already registered with Firebase Simple Login?

Question

I am using firebase (with Angularfire) for an html5 phone app. The user inputs only their email in the start screen, and then, depending on whether that email is already reg

Answer 1

A little easier example to understand how to catch if the user already exists when signing up with email / password

1. Catch the error
2. If "auth/email-already-in-use" exist
3. Call another function that contains .signInWithEmailAndPassword()

Example

    .createUserWithEmailAndPassword(email, password)

    .catch(error => {
      // Handle Errors here.
      const errorCode = error.code;
      const errorMessage = error.message;

      // Catch this errorCode to know if user exists
      if (errorCode === 'auth/email-already-in-use') {
        // Call function X to sign user in instead
        signInMail(email, password);
        return;
      } 

      // Weak password?
      else if (errorCode == 'auth/weak-password') {
        console.log('The password is too weak.');
      } 

     else {
        console.log(errorMessage);
      }
      console.log(error);
    })

Important part that you want to use in your own code would be this

.catch(error => {
      // Handle Errors here.
      const errorCode = error.code;
      const errorMessage = error.message;
      if (errorCode === 'auth/email-already-in-use') {
        console.log('This email is already in use');
        // Your action
        return;
      }
    })