app.js

var express = require('express');

var app = express();

//Setting up body-parser
app.use(express.json());
app.use(express.urlencoded({ extended: false }));

//Setting public directory
app.use(express.static(__dirname + '/public'));

//Setting view engine
app.set('view engine', 'pug');
app.set('views', __dirname + '/views');

//Setting routes
var home = require('./routes/index');
app.use('/', home);

//404
app.use((res, req, next) => {
	next(err);
});

app.all('/*', function (req, res, next) {
	if (req.headers.host.match(/^www/) !== null) {
		res.redirect('http://' + req.headers.host.replace(/^www\./, '') + req.url);
	} else {
		next();
	}
})

//Error Handler
app.use((err, req, res, next) => {
	res.status(err.status || 500);
	res.render('error');
});

//Listening
app.listen(process.env.PORT || 5000);