accessing twitter streaming api using node js

Hi I am trying to access the twitter rest api https://stream.twitter.com/1.1/statuses/filter.json I am using nodejs.

For authentication I have used ntwitter. Authentication is going through fine. I get the success message.

But once it passes authentication it is not displaying tweets. it shows something like.

----------------------------------------
o/p
----------------------------------------------------------------
tweet[object Object]
success
tweet[object Object]
tweet[object Object]
tweet[object Object]


My prog
-------------------------------------

var twitter = require('ntwitter');
var https = require('https');


var twit = new twitter({
  consumer_key: "xxxxxxxxxxxxx",
  consumer_secret: "xxxxxxxxxxxxxxxxxxxxxxx",
  access_token_key: "xxxxxxxxxxxxxxxxxxxxx",
  access_token_secret: "xxxxxxxxxxxxxxxxxx"
});

twit.verifyCredentials(function (err, data) {
    console.log("success");
  });


twit.stream('statuses/filter', {track:'manipal'}, function(response) {
          var body ='';
              response.on("data",function(chunk){
               //var tweet = JSON.parse(chunk);
                console.log("tweet" + chunk);
              });

              response.on("end",function(){
                console.log('Disconnected');
              });
});