I can't seem to be able to start a nodeJS service

I'm trying to start a service:

c:\MongoUni\Ex3\chapter3>node index.js
express-session deprecated undefined resave option; provide resave option auth.js:48:37
express-session deprecated undefined saveUninitialized option; provide saveUninitialized option auth.js:48:37
Listening on port 3000!

I get this error

c:\MongoUni\Ex3\chapter3\node_modules\mongodb\lib\server.js:228
        process.nextTick(function() { throw err; })
                                      ^
Error: connect ECONNREFUSED 127.0.0.1:27017
    at Object.exports._errnoException (util.js:1022:11)
    at exports._exceptionWithHostPort (util.js:1045:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1087:14)

via David Badlin