I want to check if the email already exists in firebase authentication before the user clicks on sign up button if there is a way.
I tried to write one with the login firebase method but it doesn't work correctly because I need the password to check.
if there is a method to check only the mail.
I am so thankful to hear your answers.
You're looking for the FetchProvidersForEmailAsync method, which returns a list of providers for the given email address.
It returns a list of providers, instead of just true/false, so that you can show a UI for each of the providers that the user can use to sign in to their account.