Wiring up a NoSQL database module to Express

Now that we have automated tests for the model and a user-defined module which makes use of it, let's build a sample Express-based application exposing this module via HTTP:

var express = require('express')
  , http = require('http')
  , path = require('path')
  , bodyParser = require('body-parser')
  , logger = require('morgan')
  , methodOverride = require('method-override')
  , errorHandler = require('errorhandler')
  , mongoose = require('mongoose')
  , dataservice = require('./modules/contactdataservice');  
var app = express();
var url = require('url');

// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');

app.use(methodOverride());
app.use(bodyParser.json());

// development only
if ('development' == app.get('env')) {
  app.use(errorHandler());
...