Integrating of Google Login API in nodejs app

Use the GoogleStrategy of passport.js library. example:

const passport = require('passport');
const { OAuthStrategy: { GoogleStrategy } } = require('passport-google-oauth');

passport.use(new GoogleStrategy({
    consumerKey: GOOGLE_CONSUMER_KEY,
    consumerSecret: GOOGLE_CONSUMER_SECRET,
    callbackURL: "http://www.example.com/auth/google/callback"
  },
  (token, tokenSecret, profile, done) => {
      User.findOrCreate({ googleId: profile.id }, function (err, user) {
        return done(err, user);
      });
  }
));

read docs for more details http://www.passportjs.org/docs/google/

Try the following link, though It's already been mentioned in the comments below your question.

https://cloud.google.com/nodejs/getting-started/authenticate-users

It's the official google cloud platform documentation on how to get started authenticating users on node js. I hope it helps.

Creating a Google login will require you to work around with Google Developer Console.

• Creating a project in Google Developer Console.
• Creating OAuth Credentials, setting up Origin URI, and Redirect URLs.

I hope this link https://infantcoder.blogspot.com/2020/06/google-login-for-nodejs.html will help you create google login for your page.