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Node.js Overview
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 event-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.
Node.js Introduction
Node.js is a tool for JavaScript framework, it is used for developing server-based applications.
Node.js is an open source server environment. It allows you to run JavaScript on the server. A Node.js app run in a single process, without creating a new thread for every request.
Node.js Prerequisites
Before proceeding, one should have a basic understanding of JavaScript. As we are going to develop web-based applications using Node.js, it will be good if you have some understanding of other web technologies such as HTML, CSS, AJAX, etc
What is Node.js ?
Node.js is a server-side platform built on Google Chrome's JavaScript Engine (V8 Engine). Node.js was developed by Ryan Dahl in 2009 and its latest version is v0.10.36. The definition of Node.js as supplied by its official documentation is as follows −
Node.js is a platform built on Chrome's JavaScript runtime for easily building fast and scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
Node.js is an open source, cross-platform runtime environment for developing server-side and networking applications. Node.js applications are written in JavaScript, and can be run within the Node.js runtime on OS X, Microsoft Windows, and Linux.
Node.js also provides a rich library of various JavaScript modules which simplifies the development of web applications using Node.js to a great extent.
Node.js = Runtime Environment + JavaScript Library
Why Node.js ?
Following are some of the important features that make Node.js the first choice of software architects.
Asynchronous and Event Driven: All APIs of Node.js library are asynchronous, that is, non-blocking. It essentially means a Node.js based server never waits for an API to return data. The server moves to the next API after calling it and a notification mechanism of Events of Node.js helps the server to get a response from the previous API call.
Very Fast: Being built on Google Chrome's V8 JavaScript Engine, Node.js library is very fast in code execution.
Single Threaded but Highly Scalable: Node.js uses a single threaded model with event looping. Event mechanism helps the server to respond in a non-blocking way and makes the server highly scalable as opposed to traditional servers which create limited threads to handle requests. Node.js uses a single threaded program and the same program can provide service to a much larger number of requests than traditional servers like Apache HTTP Server.
No Buffering: Node.js applications never buffer any data. These applications simply output the data in chunks.
License: Node.js is released under the MIT license.
Where to Use Node.js?
Following are the areas where Node.js is proving itself as a perfect technology partner.
I/O bound Applications
Data Streaming Applications
Data Intensive Real-time Applications (DIRT)
JSON APIs based Applications
Single Page Applications
Why consider Node.js for the project ?
Performance: Node.js is simply… fast, faster than other JS languages; moreover, as a runtime language it has enhanced JavaScript with new capabilities
Versatilit:: From back-end, to front-end apps, to clips to… pretty much everything in between, Node.js enables you to build any kind of project that you have in mind; as long as it’s written in JavaScript, of course
Agility: regardless of your/your team’s level of JavaScript expertise, Node.js empowers you to kick-start your project, to get it up and running in no time; it’s developer productivity-oriented (just think same language for both back-end and front-end!!!), with a low learning curve
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