Using nodejs passport-google-oauth2 without redirect url

I am using nodepm npm passport-google-oauth2 module

I am currently using it exactly as his example shows, with a redirect URI that google oauth will call back with after successful authentication:

Example:

Server side:

var GoogleStrategy = require( 'passport-google-oauth2' ).Strategy;

passport.use(new GoogleStrategy({
    clientID:     GOOGLE_CLIENT_ID,
    clientSecret: GOOGLE_CLIENT_SECRET,
    callbackURL: "http://yourdormain:3000/auth/google/callback",
    passReqToCallback   : true
  },
  function(request, accessToken, refreshToken, profile, done) {
    User.findOrCreate({ googleId: profile.id }, function (err, user) {
      return done(err, user);
    });
  }
));

      

        
        
        
      

    

Client side:

app.get('/auth/google',
  passport.authenticate('google', { scope: 
    [ 'https://www.googleapis.com/auth/plus.login',
      'https://www.googleapis.com/auth/plus.profile.emails.read' ] }
));

app.get( '/auth/google/callback', 
    passport.authenticate( 'google', { 
        successRedirect: '/auth/google/success',
        failureRedirect: '/auth/google/failure'
}));

      

        
        
        
      

    

I know there is a way to use Google OAuth without a redirect; it just stays on the same page somehow (google SSO). I think you can do it with just help GoogleVerifier

, not with construction new GoogleAuthorizationCodeTokenRequest()

(Java examples), but I'm lost at this point.

Questions:

• How to use google oauth2 without redirect URI? (I know it can be done with the GoogleVerifier object in Java).

• Am I using the wrong google SSO module in NodeJS? Is the module above for google single sign-on using OAuth2? This is for Google OAuth2, but is this the SSO way?

Thanks in advance for your help