app.js

'use strict';
const debug = require('debug');
const express = require('express');
const http = require('http');
const socket = require('socket.io');
const path = require('path');
const logger = require('morgan');
const bodyParser = require('body-parser');

const routes = require('./routes/index');

const app = express();
const server = http.createServer(app);

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', routes);

// catch 404 and forward to error handler
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.json({
            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.json({
        message: err.message,
        error: {}
    });
});

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

const io = socket(server);

io.on('connection', (client) => {
    debug('client connected');

});

server.listen(app.get('port'), function() {
    debug('Express server listening on port ' + server.address().port);
});