How to get User Info (Email ID) while using the Authorization Code Flow

[SaravgiYash]

Important gapi.auth2 notice: gapi.auth2 has been deprecated and replaced with Google Identity Services. Please see https://developers.google.com/identity/sign-in/web/deprecation-and-sunset for more information. If you have questions related to authentication/authorization please look at the associated documentation or post questions on Stack Overflow with the google-oauth tag.

Summary
I have migrated to the GIS but unable to understand how to get the User Profile Info without using the Auth Code. So I use the Authorization Code Flow which returns the Auth Code, which I send back to the backend. But I also require the user email id to map the same. But I am unable to find any documentation which solves this problem.

To get user profile information one needs to use the Auth Code and generate the access_token and refresh_token and use the same to call People's API. But then the Auth Code cannot be used by the backend.

Currently I am using an input field to get the user email id but it's causes issues due to typos.

function initClient() {
client = google.accounts.oauth2.initCodeClient({
client_id: CLIENT_ID,
scope: SCOPES,
ux_mode: 'popup',
callback: async (response) => {
auth_code = response.code;
// Logic to send the Auth Code to the backend with user email ID
}
});
}

[hermz365]

To obtain user profile information, you should use Sign in with Google library to obtain a JWT ID Token. You can use the Sign in with Google button and/or One Tap to authenticate your users and obtain the JWT ID Token.

[masa8]

I want to know this too.
I added an API on the backend for the client to get the information needed for now.
but I don't know if this is common and if there are any security risks.
This question is more about Authorization code flow than about this library though... 😅