passport.js

var LocalStrategy = require('passport-local').Strategy;
var User = require('../app/models/user');

module.exports = function(passport) {

    passport.serializeUser(function(user, done) {
        done(null, user.id);
    });

    passport.deserializeUser(function(id, done) {
        User.findById(id, function(err, user) {
            done(err, user);
        });
    });


    //LOGIN
    passport.use('login', new LocalStrategy({
        usernameField: 'email',
        passwordField: 'password',
        passReqToCallback: true
    },
    function(req, email, password, done) {
        User.findOne({'email': email}, function(err, user) {
            if(err) return done(err);
            if(!user) return done(null, false, req.flash('loginMessage', 'No user found'));
            if(!user.validPassword(password)) return done(null, false, req.flash('loginMessage', 'Oops! Wrong password'));
            return done(null, user);

        });
    }));

};

//Routes.js

module.exports = function(app, passport) {

    app.post('/login', passport.authenticate('login', {
        successRedirect: '/dashboard',
        failureRedirect: '/login',
        failureFlash: true
    }));

}

function isLoggedIn(req, res, next) {
    if(req.isAuthenticated())
        return next();
    res.redirect('/');
}