using Object.create()

object-create-server.js

var fs = require('fs');
var http = require('http');
var events = require('events');

var MyServer = new function() {
  var server = Object.create(new events.EventEmitter);

  server.on("response", function(response) {
    response.writeHead(200, {'Content-Type': 'text/plain'});
    response.end('Hello World\n');
  };

  server.on("config", function(err, json) {
    if(err) {
      console.error("Could not open config file: ", err);
      process.exit(1);
    }

    try {
      this.config = JSON.parse(json_string);
    } catch(exception) {
      console.error("There was an error parsing the json config file: ", exception);
      process.exit(1);
    }

    this.emit("start");
  }  

  server.on("start", function() {
    http.createServer((function (req, res) {
      this.emit("response", res);
    }).bind(this)).listen(this.config.port, this.config.host, function() {
      console.log("Server is bound.")
    });
  });

  server.startup = function(config_file) {
    fs.readFile(config_file, 'utf8', this.emit.bind(this, "config"));
    return this;
  };

  return server;
}

var serverObj = Object.create(MyServer).startUp(url);