app.js

var express = require('express');
var nunjucks = require('nunjucks');
var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser')
var session = require('express-session')
var passport = require('passport');     
var LocalStrategy = require('passport-local').Strategy;
var db = require('./db');

passport.use(new LocalStrategy(
  function(username, password, cb) {
    console.log("Hi");
    db.findByUsername(username, function(err, user) {
      if (err) {
        console.log("Some weird error: " + err);
        return cb(err);
      }
      if (!user) {
        console.log("User doesn't exist: " + username);
        return cb(null, false);
      }
      if (user.password != password) {
        console.log("Incorrect password");
        return cb(null, false);
      }
      console.log("Successful login");
      console.log(user);
      return cb(null, user);
    });
  }));

passport.serializeUser(function(user, cb) {
  console.log("User serialized " + user.id);
  cb(null, user.id);
});

passport.deserializeUser(function(id, cb) {
  console.log("User deserailized " + id);
  db.findById(id, function (err, user) {
    if (err) { return cb(err); }
    cb(null, user);
  });
});


// Create a new Express application.
var app = express();

nunjucks.configure('templates', {
  autoescape: true,
  express   : app
});

app.use(cookieParser());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(session({secret: 'keyboard cat', resave: false, saveUninitialized: false }));
app.use(passport.initialize());
app.use(passport.session());

// Define routes.
app.get('/',
  function(req, res) {
    console.log("User");
    console.log(req.user);
    res.render('home.nunjucks', { user: req.user });
  });

app.get('/login',
  function(req, res){
    res.render('login.nunjucks');
  });
  
app.post('/login', 
  passport.authenticate('local', {
    session: true,
    failureRedirect: '/login',
    successRedirect: '/'
  })
);

app.get('/logout',
  function(req, res){
    req.logout();
    res.redirect('/');
  });

app.get('/profile',
  require('connect-ensure-login').ensureLoggedIn(),
  function(req, res){
    console.log("User");
    console.log(req.user);
    res.render('profile.nunjucks', { user: req.user });
  });

db.js

var records = [
    { id: 1, username: 'jack', password: 'secret', displayName: 'Jack', emails: [ { value: 'jack@example.com' } ] }
  , { id: 2, username: 'jill', password: 'birthday', displayName: 'Jill', emails: [ { value: 'jill@example.com' } ] }
];

exports.findById = function(id, cb) {
  process.nextTick(function() {
    var idx = id - 1;
    if (records[idx]) {
      cb(null, records[idx]);
    } else {
      cb(new Error('User ' + id + ' does not exist'));
    }
  });
}

exports.findByUsername = function(username, cb) {
  process.nextTick(function() {
    for (var i = 0, len = records.length; i < len; i++) {
      var record = records[i];
      if (record.username === username) {
        return cb(null, record);
      }
    }
    return cb(null, null);
  });
}