How to get the access token from Google Sign-In Javascript SDK?

Question

I have a simple single-page javascript webapp which uses \"Google Sign-In for Websites\": https://developers.google.com/identity/sign-in/web/sign-in

How can I get an

Answer 1

For verification purposes it would be better to use the id_token which is part of the auth response, and can be retrieved at any point like this:

gapi.auth2.getAuthInstance().currentUser.get().getAuthResponse().id_token

The Google API Client libraries offer functions to verify the id_token and give you the associated user information on the server side: https://developers.google.com/api-client-library/