Node JS

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 a very powerful JavaScript-based framework/platform built on Google Chrome's JavaScript V8 Engine. It is used to develop I/O intensive web applications like video streaming sites, single-page applications, and other web applications. Node.js is open source, completely free, and used by thousands of developers around the world.


Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

The event loop is what allows Node.js to perform non-blocking I/O operations — despite the fact that JavaScript is single-threaded — by offloading operations to the system kernel whenever possible.

Blocking is when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes. This happens because the event loop is unable to continue running JavaScript while a blocking operation is occurring.

In Node.js, JavaScript that exhibits poor performance due to being CPU intensive rather than waiting on a non-JavaScript operation, such as I/O, isn't typically referred to as blocking. Synchronous methods in the Node.js standard library that use libuv are the most commonly used blocking operations. Native modules may also have blocking methods.

All of the I/O methods in the Node.js standard library provide asynchronous versions, which are non-blocking, and accept callback functions. Some methods also have blocking counterparts, which have names that end with Sync.

Blocking methods execute synchronously and non-blocking methods execute asynchronously.

Docker allows you to package an application with all of its dependencies into a standardized unit, called a container, for software development. A container is a stripped-to-basics version of a Linux operating system. An image is software you load into a container.

The Timers module in Node.js contains functions that execute code after a set period of time. Timers do not need to be imported via require(), since all the methods are available globally to emulate the browser JavaScript API. To fully understand when timer functions will be executed, it's a good idea to read up on the the Node.js Event Loop.


Before proceeding with this tutorial, you 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.

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  • Well researched advanced course content created by Industry professionals
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Course Syllabus

  • Intro to Node.js
    • Hello You
    • Non Blocking
    • Running Your Code
    • Read File in Server
    • Issuing a Request
    • Writing Response Headers
    • Response End
  • Events
    • Emitting Events
    • Request Event
    • Listening Twice
    • Listening for Close
  • Streams
    • File Read Stream
    • File Piping
    • Fixing Pipe
    • Download Server
  • Modules
    • Export A Function
    • Exporting An Object
    • Installing Local Modules
    • Installing Global Modules
    • Dependency
    • Semantic Versioning
  • express
    • Express Routes
    • Route Params
    • Rendering
    • URL Building
    • Doing the Request
    • Express Server
  • io
    • Setting Up Server-Side
    • Client Setup
    • Listening For Questions
    • Broadcasting Questions
    • Saving Client Data
  • Persisting Data
    • SQLite
    • Database connection
    • Insert, Select, Update, Delete
  • REsT API
    • Express Route
    • CRUD Operation
    • GET, POST, PUT and DELETE Method

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