node js server

server.js

var http = require('http');
var server = undefined;

function HttpServer(config) {
    this.port = config.port;
}

HttpServer.prototype.start = function (fn) {
    server = http.createServer(function (req, res) {
      res.writeHead(200, {'Content-Type': 'application/json'});
        res.end(JSON.stringify({ data: 'Some data'}));
    }).listen(this.port, fn);
     console.log('Server started at [%s]', this.port);
    return this;
};

HttpServer.prototype.stop = function (fn) {
    server.close();
    if (fn) {
        fn();
    }
};

exports.HttpServer = HttpServer;