Having a trouble with Google OAuth2 (app has no backend, so client side only)

Question

I am trying to implement client side only login using OAuth. Getting the following error:

details: "You have created a new client application that uses libraries for user authentication or authorization that will soon be deprecated. New clients must use the new libraries instead; existing clients must also migrate before these libraries are deprecated. See the [Migration Guide](https://developers.google.com/identity/gsi/web/guides/gis-migration) for more information."
error: "idpiframe_initialization_failed"

After that, whenever i try to sign in, i get the following error:

error: "popup_closed_by_user"
[[Prototype]]: Object

Right now i am working on localhost:3000, so i added http://localhost:3000 as authorized JS origin in OAuth 2.0 Client IDs, also tried changing publishing status from testing to production. User type is set to External.

Answer 1

I had the same error, but in React app. There is the solution

import React, { useEffect } from 'react';
import { GoogleLogin, GoogleLogout } from 'react-google-login';
import env from 'react-dotenv';
import { gapi } from 'gapi- script';

function AuthPage() {  
  useEffect(() => {
    function start() {
      gapi.client.init({
        clientId: env.REACT_PUBLIC_GOOGLE_CLIENT_ID,
        scope: 'email',
      });
    }

    gapi.load('client:auth2', start);
  }, []);


  // **you can access the token like this**
  // const accessToken = gapi.auth.getToken().access_token;
  // console.log(accessToken);

  const onSuccess = response => {
    console.log('SUCCESS', response);
  };
  const onFailure = response => {
    console.log('FAILED', response);
  };
  const onLogoutSuccess = () => {
    console.log('SUCESS LOG OUT');
  };

  return (
    <div>
      <GoogleLogin
        clientId={env.REACT_PUBLIC_GOOGLE_CLIENT_ID}
        onSuccess={onSuccess}
        onFailure={onFailure}
      />
      <GoogleLogout
        clientId={env.REACT_PUBLIC_GOOGLE_CLIENT_ID}
        onLogoutSuccess={onLogoutSuccess}
      />
    </div>
  );
}

export default AuthPage;

Answer 2

By default, newly created Client IDs are now blocked from using the older Platform Library, existing Client IDs are unaffected. New Client IDs created before July 29th, 2022 can set plugin_name to enable use of the Google Platform Library.

So, in my case the solution was:

window.gapi.load('client:auth2', () => {
            window.gapi.client.init({
                clientId: '******.apps.googleusercontent.com',
                plugin_name: "chat"
            })