JavaScript has been a client side technology for a really long time. It has also been the client side scripting language of choice by programmers. But with the advent of Nnode.js platform it is finding its way on the server-side. The biggest advantage in using JavaScript on server side is that the communication can happen in the same language between client-side and server side. This open source server-side framework allows Web developers to write event-driven JavaScript applications that run on Google's open source V8 JavaScript engine.