Node.js - Hello World

$ npm install -g tsd // if not install tsd
$ tsd install node --save // install node tsd file and save in tsd.json

var http = require("http");

var httpServer = http.createServer(function (request, response) {

    response.writeHead(200, { "content-type" : "text/html" });
    response.write("<h1>Hello World</h1>");
    response.end();

});

httpServer.listen(1234);

console.log("Server running at 1234 port");