Node.js Passport Display username after successful login
<p>I am using Node.js Passport and I'm trying to figure out how to display username after a successful login. After reading the documentation I've verified that i have Sessions and Middleware configured which is what I need but what are my next steps? </p>

<p>This is my <strong>users.js</strong> file:</p>

<pre><code>var express = require('express');
var router = express.Router();
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;

var User = require('../models/user');

// Home
router.get('/index', function(req, res){
    res.render('index');
});
// Profile
router.get('/profile', function(req, res){
    res.render('profile');
});
// Register
router.get('/register', function(req, res){
     res.render('register');
});

// Login
router.get('/login', function(req, res){
    res.render('login');
});

// About-us
router.get('/about-us', function(req, res){
    res.render('about-us');
});


// Register User
router.post('/register', function(req, res){
var email = req.body.email;
var username = req.body.username;
var password = req.body.password;

// Validation
req.checkBody('username', 'Username is Required').notEmpty();
req.checkBody('email', 'Email is required').notEmpty();
req.checkBody('email', 'Email is not valid').isEmail();
req.checkBody('password', 'Password is required').notEmpty();

var errors = req.validationErrors();

if(errors){
    res.render('register',{
        errors:errors   
    });
} else {
    var newUser = new User({
        email:email,
        username: username,
        password: password,
    });

    User.createUser(newUser, function(err, user){
        if(err) throw err;
        console.log(user);
    });

    req.flash('success_msg', 'You are now registered. Log In!');
    res.redirect('/users/login');
}
});

passport.use(new LocalStrategy(
function(username, password, done) {
User.getUserByUsername(username, function(err, user){
if(err) throw err;
if(!user){
    return done(null, false, {message: 'User does not exist!'});
}

User.comparePassword(password, user.password, function(err, isMatch){
    if(err) throw err;
    if(isMatch){
        return done(null, user);
    } else {
        return done(null, false, {message: 'Invalid password'});
    }
    });
    });
    }));

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

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


router.post('/login',
passport.authenticate('local', {successRedirect:'/users/profile',      failureRedirect:'/users/login',failureFlash: true}),
function(req, res) {
res.redirect('/users/profile')

});

router.get('/logout', function(req, res){
req.logout();

req.flash('success_msg', '');

res.redirect('/');
});

module.exports = router;
</code></pre>

<p>And this is my <strong>app.js</strong> file:</p>

<pre><code>var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var exphbs = require('express-handlebars');
var expressValidator = require('express-validator');
var flash = require('connect-flash');
var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var mongo = require('mongodb');
var mongoose = require('mongoose');
 mongoose.connect('mongodb://localhost/loginandregister');
 var db = mongoose.connection;

var routes = require('./routes/index');
var users = require('./routes/users');

// Init App
var app = express();

// View Engine
app.set('views', path.join(__dirname, 'views'));
app.engine('handlebars', exphbs({defaultLayout:'layout'}));
app.set('view engine', 'handlebars');

// BodyParser Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

// Set Static Folder
app.use(express.static(path.join(__dirname, 'public')));
app.use('/public', express.static('public'));

// Express Session
app.use(session({
    secret: 'secret',
    saveUninitialized: true,
    resave: true
}));

// Passport init
app.use(passport.initialize());
app.use(passport.session());

// Express Validator
app.use(expressValidator({
  errorFormatter: function(param, msg, value) {
    var namespace = param.split('.')
      , root    = namespace.shift()
      , formParam = root;

while(namespace.length) {
  formParam += '[' + namespace.shift() + ']';
}
return {
  param : formParam,
  msg   : msg,
  value : value
 };
 }
 }));

// Connect Flash
app.use(flash());

// Global Vars
app.use(function (req, res, next) {
  res.locals.success_msg = req.flash('success_msg');
  res.locals.error_msg = req.flash('error_msg');
  res.locals.error = req.flash('error');
  res.locals.user = req.user || null;
  next();
});



app.use('/', routes);
app.use('/users', users);

// Set Port
app.set('port', (process.env.PORT || 3000));

app.listen(app.get('port'), function(){
    console.log('Server started on port '+app.get('port'));
});
</code></pre>

<p>I've read a similar question on the site and the answer stated that:</p>

<pre><code>app.get('/example', function(req, res) {
res.render('index', { username: req.user.username });
});
</code></pre>

<p>needs to be implemented. But I am confused as to where and how? I tried placing it into to my users.js file but i get a "ReferenceError: app is not defined" error in terminal when restarting the node app.
What are my next steps? Any and every help is valued and appreciated. Thank you.</p>

<p>EDIT:</p>

<p>I added </p>

<pre><code>router.get('/profile', function(req, res){
res.render('profile', { username: req.user.username });
});
</code></pre>

<p>to my users.js file and added: </p>

<pre><code>&lt;header&gt;
  &lt;h1&gt;Hello?&lt;/h1&gt;
  {{#if user}}
    &lt;p&gt;Hello {{username}}&lt;/p&gt;
  {{else}}
    &lt;p&gt;Please &lt;a href='/users/login'&gt;Log In&lt;/a&gt;&lt;/p&gt;
  {{/if}}
 &lt;/header&gt;
</code></pre>

<p>to my profile.handlebars page but still no username display. What am i missing???</p>

<p><strong>SOLUTION:</strong> Apparently my code was correct and my problem was solved hours ago however it was hiding in plain site. I am using Firefox to build my site and Chrome to conduct all my research and web searching. After DEEP searching i stumbled upon another similar question to my own and this guy complained that he had <code>&lt;p&gt;Hi, {{username}}&lt;/p&gt;</code> within his index file but only <code>Hi</code> was showing up within his browser. On the contrary neither <code>Hi or {{username}}</code> was showing in my browser. My entire <code>&lt;p&gt;</code> tag was missing. So i simply loaded my site in Chrome and there it was problem solved! Bad practice on my part for only using one browser but that's what I get for silly mistakes :)</p>