gapi is not defined - Google sign in issue with gapi.auth2.init

Question

I\'m trying to implement Google Sign In and retrieve the profile information of the user. The error is: Uncaught ReferenceError: gapi is not defined. Why is that?

Answer 1

The problem is not only in gapi. To call init method - auth2 object must be initialized. There is a promise once a google auth object is in fully initialized GoogleAuth.then(onInit, onFailure)

gapi.load('auth2', initSigninV2);

function initSigninV2() {
    gapi.auth2.init({
        client_id: 'CLIENT_ID.apps.googleusercontent.com'
    }).then(function (authInstance) {
        // now auth2 is fully initialized
    });
}