Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. npm is a Node.js package of open source library which is largest in the world.

It’s an asynchronous event driven JavaScript runtime, which is designed to build scalable network applications.It can handle many concurrent connections at a time, where when connection request are made concurrently for each connection a callback is fired .If there is no task to be performed Node will go to sleep.

Node.js connection handling mechanism is super efficient than our existing classical thread based model Thread-based networking is relatively inefficient and very difficult to use. Furthermore, users of Node are free from worries of dead-locking the process, since there are no locks. Almost no function in Node directly performs I/O, so the process never blocks. Because nothing blocks, scalable systems are very reasonable to develop in Node.

Node.js is an open source server environment

Node.js is free

Node.js runs on various platforms

Node.js uses JavaScript on the server

Features of Node.js

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.

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

Node.js Skills

node.js is the most popular framework in technology today, according to the most recent Stack Overflow Developer Survey, and its popularity just keeps growing. It’s not a big surprise. The flexibility and ease of JavaScript coupled with the power of a fast async loop and a thriving community have only increased the productivity and power of Node.js developers.

. Web application frameworks

. Security

. Databases

. Package management

. Cloud platforms

. front end

. Source control

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