Node.js
Node.js allows the developers to develop a web application in a single language called JavaScript for both client side and server side.
Unlike the other programming languages, Node.js has its cycle of the event in the form of language which is very beneficial for high-performance and scalable application development.
It is required for those web applications where traffic rate is very high. Node.js is an event based I/O language and its response time is very high rather than the other traditional languages. It is being used by the famous websites like Linked in, Twitter and Gmail.
The runtime environment of Node.js interprets JavaScript, which is very easy and simple to understand and code. Due to this reason, even the developers find it easy going which keeps them happy and relaxed. It is pertinent for real-time collaborative apps.
It is perfect for applications that involve the exchange of information and not merely the computational process. Most of the application revolves around the JSON data exchange and image resources.
Installation is the first stage of any application development. node.js web application development is compatible and easy for installation on Windows, Mac or Linux PC. And moreover, the developers need less time to develop, as it works on the JavaScript everywhere.
Ajax
It is a combination several pre-existing technologies which include XHTML and CSS.
Different applications refresh before finally interacting with the complete page. This can be a cumbersome and time taking. And when the page is loaded with heavy graphics, the wait is even longer.
In Ajax, bandwidth is used for accomplishing specific demands and does not require page reloading.
It is used to format and present the interface between a web page and a database. It allows you to retrieve data asynchronously from the server without interfering with the display and behavior of the existing page.
The initial loading time for a page may be comparatively higher, depending on the data required to be presented when handling request objects.
There are no adopted best practices to test Ajax applications because of lack of a standards body. The currently available tools fail to understand the models and data protocols in an Ajax-enabled event.
Devices like PDAs, mobiles and other screen readers may not have the necessary support to interpret Ajax enabled pages.
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