Using the Twitter Streaming API from node.js

gistfile1.js

var https = require('https'),
    http = require('http'),
    querystring = require('querystring');

var postData = querystring.stringify({
  delimited: 'length',
  track: '#wow'
});

var options = {
  host: 'stream.twitter.com',
  path: '/1/statuses/filter.json',
  method: 'POST',
  auth: '<username>:<password>', // Please set your credentials here!
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Content-Length': postData.length
  }  
};

console.log("Connecting to Twitter streaming API ...");
var req = https.request(options, function(res) {
  console.log("Connected! Response code: " + res.statusCode);
  console.log('HEADERS: ' + JSON.stringify(res.headers));
  res.setEncoding('utf8');
  res.on('data', function(chunk) {
    var msg = chunk.toString('utf8');
    var pos = msg.indexOf("{"); // The object might NOT begin at index 0!
    msg = msg.substring(pos);
    //console.log(">>>" + msg + "<<<");
    var statusMsg = JSON.parse(msg);
    //console.log(statusMsg);
    console.log(statusMsg.user.screen_name + ": " + statusMsg.text);
  });
});

req.on('error', function(e) {
  console.error(e);
});

req.write(postData);
req.end();