Very basic Node.js app using MongoLab and Heroku

.gitignore

node_modules

package.json

{
  "name": "mongolabtest",
  "version": "1.0.0",
  "description": "Sample app using Heroku, Node.js, and MongoLab",
  "engines":{
    "node": "0.6.x",
    "npm": "1.0.x"
  },
  "dependencies": {
    "connect": "1.8.x",
    "mongodb": "0.9.x"
  }
}

Procfile

web: node server.js

server.js

var connect = require('connect'),
  mongo = require('mongodb');

// Connect to a mongo database via URI
// With the MongoLab addon the MONGOLAB_URI config variable is added to your
// Heroku environment.  It can be accessed as process.env.MONGOLAB_URI
mongo.connect(process.env.MONGOLAB_URI, {}, function(error, db){

  // console.log will write to the heroku log which can be accessed via the 
  // command line as "heroku logs"
  db.addListener("error", function(error){
    console.log("Error connecting to MongoLab");
  });
  
  db.createCollection('requests', function(err, collection){
    db.collection('requests', function(err, collection){
      var requestCollection = collection;
      connect(
        connect.favicon(),                    // Return generic favicon
        connect.query(),                      // populate req.query with query parameters
        connect.bodyParser(),                 // Get JSON data from body
        function(req, res, next){             // Handle the request
          res.setHeader("Content-Type", "application/json");
          if(req.query != null) {
            requestCollection.insert(req.query, function(error, result){
              // result will have the object written to the db so let's just
              // write it back out to the browser
              res.write(JSON.stringify(result));
            });
          }
          
          res.end();
        }
      ).listen(process.env.PORT || 8080);
      // the PORT variable will be assigned by Heroku
    });
  });
});