App.js for reading data from Mongo. From 'Building a RESTful API' (post at http://www.antoinedahan.com/blog/BuildingRESTfulAPI/)

app.js

/* express initialization */
var express = require('express');
var app = express();

/* body-parser initialization (use the body-parser json package) */
var bodyParser = require('body-parser');
app.use(bodyParser.json());

/* Main Router */
var ourApiRouter = express.Router();

//Function that's called when /api/ is accessed
ourApiRouter.use(function (req, res, next) {

    var requestFullPath = req.originalUrl;

    if(requestFullPath != null) {

        //Parse the lastname from the url
        var lastName = requestFullPath.substring(requestFullPath.indexOf('api/') + 4);

        var MongoClient = require('mongodb').MongoClient;
        var format = require('util').format;

        //Accessing the local mongo database named 'test' (mongo's default port is 27017)
        MongoClient.connect('mongodb://127.0.0.1:27017/test', function (err, db) {
            if (err) {
                throw err;
            } else {

                //Read the entire collection 'players' from the database
                var collection = db.collection('players');

                //Of the entire collection, find the one with the name attribute matching the lastname from the url
                collection.find({name: {$regex: '^[A-z]+[ ]+' + lastName + '$'}}).toArray(function (err, docs) {

                    if(docs == null || docs.length == 0) {
                        res.json({ ERROR : "No player foudn with last name: " + lastName});
                    }

                    else {
                        res.json(docs[0]);
                        console.log(docs[0]);
                    }

                });
            }
        });
    }
});

//Registering the main router
app.use('/api/', ourApiRouter);

//Add our app the the module
module.exports = app;