index.js

var nconf = require('nconf');
var Twit = require('twit');
var _ = require('lodash');

var TwitterStreamChannels = require('twitter-stream-channels');

nconf.file({ file: 'config.json' }).env(); // Twitter Consumer key & Access key  --For Twit

var credentials = require('./config2.json')            //For TwitterStreamChannels
var client = new TwitterStreamChannels(credentials);  //For TwitterStreamChannels	

var twitter = new Twit({
  consumer_key: nconf.get('TWITTER_CONSUMER_KEY'),
  consumer_secret: nconf.get('TWITTER_CONSUMER_SECRET'),
  access_token: nconf.get('TWITTER_ACCESS_TOKEN'),
  access_token_secret: nconf.get('TWITTER_ACCESS_TOKEN_SECRET')
});

var channels = {  //Filter Chanels
	"languages" : ['javascript','php','java','python','perl'],
	"js-frameworks" : ['angularjs','jquery','backbone','emberjs'],
	"web" : ['javascript','nodejs','html5','css','angularjs']
};
/*
//------------------------------------------------------------------------ Stream a sample of public statuses ...

var tweetStream = twitter.stream('statuses/sample');

tweetStream.on('tweet', function (tweet) {
  console.log('----------------------------------------');
  console.log('screen_name:', tweet.user.screen_name);
  console.log('text:', tweet.text);
  
}); 

//------------------------------------------------------------------------ Stream ausing a filter and location ...

var srilanka = [ '79.6951668639', '5.96836985923', '81.7879590189', '9.82407766361' ]

//  filter the twitter public stream 

var stream = twitter.stream('statuses/filter', { locations: srilanka , track: 'Apple' })
 
stream.on('tweet', function (tweet) {
  console.log('screen_name:', tweet.user.screen_name);
  console.log('text:', tweet.text);
  console.log('----------------------------------------');
})
*/

//------------------------------------------------------------------------ StreamChannels developing ...

var stream = client.streamChannels({track:channels});

stream.on('channels/languages',function(tweet){
    console.log('>languages',tweet.text);  //any tweet with 'javascript','php','java','python','perl'
});

//---------------------------------------git hub...