Using Same Firebase for Web App as well as Android App Create Android app in that project go to project setting click on iso or android or web icon. Go to authentication select Google then enable select email Get client id from web sdk - Create.env.local GOOGLE_CLIENT_ID=259eklrjelkjr GOOGLE_CLIENT_SECRET=GOlkelkrjer NEXTAUTH_URL=https://localhost:3000 - Restart the server/app - Create folder in pages/auth/signin.js