NodeJS: Passport authentication not working - node.js

Question

I am using passport local for authentication and the login credentials don't get authenticated. I just get redirected to the failureRedirect. I don't even get the flash error.
Here is my login route:
var express = require('express');
var router = express.Router();
var passport = require('passport');
var flash = require('connect-flash');
router.get('/', function(req, res, next) {
if(req.user){
return res.redirect('/profile');
}
var vm = {
title: 'Login',
error: req.flash('error')
};
res.render('login', { title: 'Place an order' });
});
router.post('/',
passport.authenticate('local', {
failureRedirect: '/login',
successRedirect: '/profile',
failureFlash: 'Invalid credentials'
}));
module.exports = router;
This is app.js:
var express = require('express');
var path = require('path');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var passport = require('passport');
var expressSession = require('express-session');
var flash = require('connect-flash');
var config = require('./config');
var routes = require('./routes/index');
var signup = require('./routes/signup');
var login = require('./routes/login');
var profile = require('./routes/profile');
var restrict = require('./auth/restrict');
var passportConfig = require('./auth/passport-config');
passportConfig();
mongoose.connect(config.mongoUri);
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hbs');
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(expressSession({
secret: 'themsec',
saveUninitialized: false,
resave: false
}));
app.use(flash());
app.use(passport.initialize());
app.use(passport.session());
app.use('/', routes);
app.use('/signup', signup);
app.use('/login', login);
//app.use(restrict);
app.use('/profile', profile);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
Passport-config:
module.exports = function(){
var passport = require('passport');
var passportLocal = require('passport-local');
var userService = require('../services/user-service');
passport.use(new passportLocal.Strategy({username: 'email'},function(email, password, next){
userService.findUser(email, function(err, user){
if(err){
return next(err);
}
if(!user || user.password!= password){
return next(null, null);
}
next(null, user);
});
}));
passport.serializeUser(function(user, next){
next(null, user.email);
});
passport.deserializeUser(function(email, next){
userService.findUser(email, function(err, user){
next(err, user);
});
});
};
User services:
var User = require('../models/user').User;
exports.addUser = function(user, next){
var newUser = new User({
firstName: user.firstName,
lastName: user.lastName,
email:user.email.toLowerCase(),
password: user.password,
});
newUser.save(function(err){
if(err)
return next(err)
next(null);
});
};
exports.findUser = function(email, next){
User.findOne({email:email.toLowerCase()}, function(err, user){
next(err, user)
});
};
User model:
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var userService = require('../services/user-service');
var userSchema = new Schema({
firstName: {type: String, required: true},
lastName: String,
email: {type: String, required: true},
password: {type: String, required: true},
created: {type: Date, default: Date.now}
});
userSchema.path('email').validate(function(value, next){
userService.findUser(value, function(err, user){
if(err){
console.log(err);
return false;
}
next(!user)
});
}, 'That email is already in use');
var User = mongoose.model('User', userSchema);
module.exports = {
User:User
};
Someone please help me, I am turning mad with frustration. I am new to Node.
Edit: I have removed the code that would lead to an infinite loop if the user logged-in, however, I still cannot login.