I Want To Check If User Exist Before Login If Not They Must Sign Up, In Firebase Google Auth

javascript reactjs firebase-authentication

Solution 1:

You'll need to know at least part of the user's credentials to check if they already exist in Firebase Authentication.

For example, if the user signed in with a provider that requires their email before, you'll should ask them for their email address next time and then call fetchSignInMethodsForEmail to determine if Firebase already has a user for that email address.

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