server.js

var express = require('express');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var routes = require('./config/routes');
//var users = require('./routes/users');
var debug = require('debug')('my-application');

var config = require('./config/config');
var mongoose = require('mongoose');
var app = express();

// view engine setup
app.set('views', path.join(__dirname, '/app/views'));
app.set('view engine', 'jade');

app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

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

/// catch 404 and forwarding 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.render('error', {
            message: err.message,
            error: err
        });
    });
}

// Bootstrap db connection
// Connect to mongodb
var connect = function () {
  var options = { server: { socketOptions: { keepAlive: 1 } } }
  mongoose.connect(config.db, options)
}
connect()

// Error handler
mongoose.connection.on('error', function (err) {
  console.log(err)
})

// Reconnect when closed
mongoose.connection.on('disconnected', function () {
  connect()
})

// 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.set('port', process.env.PORT || 18080);

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

module.exports = app;