app.js

var express = require('express');
var path = require('path');

var routes = require('./routes/router');

var app = express();

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

app.use(express.static(path.join(__dirname, 'public')));

app.disable('x-powered-by');

app.use('/', routes);

app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err,
        error: err.status
    });
});

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

var server = app.listen(app.get('port'), function() {
  console.log('Server listening on port ' + server.address().port);
});