web.js

// web.js
var express = require("express");
var logfmt = require("logfmt");
var app = express();

app.use(logfmt.requestLogger());

app.get('/', function(req, res) {
    var mongo = require('mongodb');

    var mongoUri = process.env.MONGOLAB_URI ||
        process.env.MONGOHQ_URL ||
        'mongodb://localhost/mydb';

    mongo.Db.connect(mongoUri, function (err, db) {
        db.collection('mydocs', function(er, collection) {
            collection.insert({'mykey': 'myvalue'}, {safe: true}, function(er,rs) {
            });
        });
    });
    res.send('Update 1!');
});

var port = process.env.PORT || 5000;
app.listen(port, function() {
    console.log("Listening on " + port);
});