server.js

var express = require('express');
var app = express();

var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// configure a public directory to host static content
app.use(express.static(__dirname + '/public'));

var project = require('./project/app.js');
project(app);
// var assignment = require('./assignment/app.js');
// assignment(app);

var path = require("path");
var mongodb = require("mongodb");
var ObjectID = mongodb.ObjectID;

var db;

// Connect to the database before starting the application server.
mongodb.MongoClient.connect(process.env.MONGODB_URI
    ||'mongodb://localhost/shuxincs5610', function (err, database) {
    if (err) {
        console.log(err);
        process.exit(1);
    }

    // Save database object from the callback for reuse.
    db = database;
    console.log("Database connection ready");

    // Initialize the app.
    var server = app.listen(process.env.PORT || 8080, function () {
        var port = server.address().port;
        console.log("App now running on port", port);
    });
});