Node.js Googe Authentication Callback Error

I'm trying to set up Googe Authentication to a website running off node.js, passport.js, express & mongodb, largely based off this example. I have managed to get local authentication working but when trying to get Google Authentication working, I'm getting a TypeError: OAuth2Strategy requires a verify callback error when trying to initialise the server.

The authentication strategy for Google is held in /config/passport.js, shown below:

var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy();
var User = require('../models/user');
var configAuth = require('./auth');

module.exports = function(passport) {
    // serialize the user session
    passport.serializeUser(function(user, done) {

    // deserialize the user session
    passport.deserializeUser(function(id, done) {
        User.findById(id, function(err, user) {
            done(err, user);

// =================GOOGLE=======================

    var strategyOptions = {
        clientID        : configAuth.googleAuth.clientID,
        clientSecret    : configAuth.googleAuth.clientSecret,
        callbackURL     : configAuth.googleAuth.callbackURL,

    var verifyCallback = function(token, refreshToken, profile, done) {

        process.nextTick(function() {
            User.findOne({ '' : }, function(err, user) {
                if (err)
                    return done(err);

                if (user) {
                    return done(null, user);
                } else {
                    var newUser = new User();

           = token;
           = profile.displayName;
           = profile.emails[0].value;

                        if (err)
                            throw err;
                        return done(null, newUser);


    passport.use(new GoogleStrategy(strategyOptions, verifyCallback));


My app.js looks as follows (with the invocation of passport.js bolded):

// set up ================================================================
var express = require('express');
var app = express()
var path = require('path');
var mongoose = require('mongoose');
var passport = require('passport');
var flash = require('connect-flash');

var morgan = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var session = require('express-session');

var configDB = require('./config/database.js');

// config ================================================================



//set up express application

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(session({ secret: 'what a long string' }));
app.use(express.static(path.join(__dirname, 'public')));

// routes ================================================================

require('./routes/index.js')(app, passport);

// launch ================================================================

module.exports = app;

I can't tell what is going wrong here, because as far as I can see verifyCallback is being supplied in the passport.use() function. I've spent the last day Googling around and searching through StackOverflow but haven't found a fix that works yet.

Apologies if this is a really obvious error, I'm new to the whole node ecosystem and web design in general. Happy to provide more information if that is helpful.



You have done it well.The issue is with getting google strategy.

Change this line

var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy();

To below mentioned one

var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
  • You can see the working example here for any other issue.

For Reference: