JavaScript Bridge

Google Sign-In Bridge

Trigger native Google account selection and receive profile, server code, or ID token data.

Before you start

Choose the response type
Use profile for account information, code for backend exchange, or id_token when your server validates Google ID tokens.
Start sign-in
Call webtoapp.googleSignIn with Web Client ID, scopes, response type, optional redirect URI, and state.
Handle the response
Listen for webtoapp:google-sign-in or webtoapp.onmessage. Handle cancel and error states.
Validate server-side
Verify code or token and state before creating the website session.

webtoapp.googleSignIn({
  web_client_id: "WEB_CLIENT_ID",
  scope: "openid email profile",
  response_type: "code",
  state: crypto.randomUUID()
});