old_contents: var http = require('http');
  var fs = require('fs');
  var express = require('express');
  var expressValidator = require('express-validator');
  var path = require('path');
  var assert = require('assert');
  
  var app = express();
  var appValidator = expressValidator();
  
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon("public/img/favicon.ico"));
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(appValidator);
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(function (req, res) {
    res.status(404).render('404', {title: 'Not found, 404'});
  });
  
  if ('development' === app.get('env')) {
    app.use(express.errorHandler());
  }
  
  var routesDir = './routes';
  fs.readdir(routesDir, function (err, files) {
    assert.ifError(err);
    files.forEach(function (file) {
      require(path.join(__dirname, routesDir, file)).init(app);
    });
  });
  
  var server = http.createServer(app).listen(app.get('port'), function() {
    var address = server.address();
    console.log("opened server on %j %s", address.address, address.port);
  });
  
new_contents: var http = require('http');
  var fs = require('fs');
  var express = require('express');
  var expressValidator = require('express-validator');
  var path = require('path');
  var assert = require('assert');
  var mongoose = require('mongoose');
  
  mongoose.connect('mongodb://localhost/jsconfuy');
  
  var app = express();
  var appValidator = expressValidator();
  
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon("public/img/favicon.ico"));
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(appValidator);
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(function (req, res) {
    res.status(404).render('404', {title: 'Not found, 404'});
  });
  
  if ('development' === app.get('env')) {
    app.use(express.errorHandler());
  }
  
  var routesDir = './routes';
  fs.readdir(routesDir, function (err, files) {
    assert.ifError(err);
    files.forEach(function (file) {
      require(path.join(__dirname, routesDir, file)).init(app);
    });
  });
  
  var server = http.createServer(app).listen(app.get('port'), function() {
    var address = server.address();
    console.log("opened server on %j %s", address.address, address.port);
  });
  
subject: Add mongoose configuration