app.js

const path = require('path');
const express = require('express');
const bodyParser = require('body-parser');
const routes = require('./routes');

const app = express();

const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: false
}));

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

app.use('/', routes);

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

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});

app.listen(port, function () {
    console.log('[+] Listening on port ' + port)
});