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Node.js

Contributor(s): James Denman

Node.js, often called simply "Node" in conversation, is a development platform built on top of Google's V8 JavaScript virtual machine. While JavaScript engines (including V8) are traditionally run in Web browsers to form the client side of a client/server application, the Node.js libraries are focused on building server-side applications in JavaScript.

Node.js is intended to run on a dedicated HTTP server and to employ a single thread with one process at a time. Node.js applications are events-based and run asynchronously. Code built on the Node platform does not follow the traditional model of receive, process, send, wait, receive. Instead, Node processes incoming requests in a constant event stack and sends small requests one after the other without waiting for responses.

This is a shift away from mainstream models that run larger, more complex processes and run several threads concurrently, with each thread waiting for its appropriate response before moving on.

One of the major advantages of Node.js, according to its creator Ryan Dahl, is that it does not block input/output (I/O). Some developers are highly critical of Node.js and point out that if a single process requires a significant number of CPU cycles, the application will block and that the blocking can crash the application. Proponents of the Node.js model claim that CPU processing time is less of a concern because of the high number of small processes that Node code is based on.

See also: PHP, Ruby

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This was last updated in April 2012

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"Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js is perfect for data-intensivereal-time applications that run across distributed devices. <a href="http://www.linkites.com">Node js development company</a>
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Node.Js

Node.js is highly customizable server engine getting popular as a mean for JavaScript codes to build real-time web APLs that can run across devices.

It uses the Google Chrome's v8, one of the finest JavaScript engine for running standalone JavaScript programs. The point to understand here is that Node.js itself is not JavaScript, it is a program for running JavaScript. JavaScript fails to deal with operating system-level sockets and network connectivity issues. Node program is written in C, a language perfectly capable of doing the grunt work and heavy lifting needed for networking. JavaScript is perfectly suitable for sending instructions to C program that can be carried out in the dungeons of your OS.

Node.js contain a build-in library that allows its applications to act as a web server without any software such as HTTP server or IIS
As an asynchronous event-driven framework, Node.js is designed to build scalable network applications.

It provides an event-driven architecture and a non-blocking I/O API that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. Almost no function in Node directly performs I/O, so the process never blocks.

It’s great at micro-requests; at evented I/O. Use Node for quick communication between a web page and a server. These technologies are commonly used for real-time web applications.

Node.js customizable feature make it work OS X, Microsoft Windows, Linux, FreeBSD, NonStop, IBM AIX, IBM System z and IBMi. Its work is hosted and supported by the Node.js Foundation, a Collaborative Project at Linux Foundation.

Node.js lets you do really powerful things without much of hard work. Suppose you have a Node.js program that does a variety of tasks, listens on a TCP port for commands, encodes some images and whatever. With some lines of code, you can add in an HTTP-based web management portal that shows the current status of active tasks. This is EASY to do

Node is getting popular as a server-side platform and is used by IBM, Microsoft, Yahoo!, Walmart, Groupon, SAP, LinkedIn, Rakuten, PayPal, Voxer, and GoDaddy and many more.

Try this technology and explore the possibilities.
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