db.js

var MongoClient = require('mongodb').MongoClient,
    config = require('easy-config');

var DB = function () {

    function connect (cb) {

        MongoClient.connect(config.mongodb.url, function (err, db) {

            if (err) {
                throw new Error('Connection error, this needs better handling! ', err);
            } else {
                return cb(db);
            }
        });
    }

    return {
        get: connect
    };
}();

module.exports = DB;

user.js

'use strict';

var User = function (db) {

    var collection = db.collection('users');

    function find (cb) {
        collection.find().toArray(function (err, users) {
            if (err) {
                return cb(err);
            }
            return cb(null, users);
        });
    }

    function create () {

    }

    return {
        find: find,
        create: create
    };
};

module.exports = User;