Zilb module in Node js

Zilb module in Node js

Hey readers, in this article, we will be covering all about Zlib modules in Node js and how to use them along with methods. Before jumping directly to the methods part, we will learn about Node js and the basics of what exactly Zlib modules are in Node js. So if you are new to all these concepts, don’t worry, we will be covering it right from the fundamentals and will then move to differences. So keep reading.


The Node js runtime is based on Chrome’s V8 JavaScript engine. Node js is a lightweight and scalable network-driven app framework built on an asynchronous event-driven JavaScript runtime. The development of Node js applications can be readily scaled in both horizontal and vertical orientations. Both client-side and server-side apps are built with Node js. It has an open-source JavaScript runtime environment/model that allows single modules to be cached.

It is an open-source organization and it provides a runtime environment for running JavaScript code beyond your browser. It is not a framework neither it is a programming language. It is mostly used in the backend for building  API services, accessing databases, etc.

Why do developers use Node js?

Following are the reasons for choosing Node js over other backend languages:

  • Easy to learn as it uses JavaScript
  • Used for agile development and prototyping
  • Provides fast and scalable services
  • Asynchronous nature
  • Uses “Single-threaded-event-loop” architecture

Node js helps developers build large complex applications with ease by using microservices. It can handle thousands of requests coming to the server without slowing down the system. Using microservices in Node js, one can easily scale a large-scale system and can divide it into different chunks for feature updates. It helps add independent features to the application without changing other services.

Uses cases/Applications:

Both tech stacks are being widely used for developing web apps. Large tech giants like Netflix, Airbnb, and Instagram use this tech stack in their applications.

It is largely used by developers in the backend of an application. Due to its non-blocking I/O and asynchronous nature, it has become the primary language used on the server side. Tech giants like Netflix, PayPal, Linkedin, and Uber use it for building API and servers. 


  • API server
  • Data streaming
  • Microservices
  • Building Real-time applications

Node js summary

  • Used in back-end for building back-end services like API
  • MVC (Model-View-Controller) framework is supported by Node js
  • Uses event-driven, non-blocking I/O model written in C++ language and runs on chrome’s v8 engine
  • The language used is JavaScript
  • Does back-end work like authentication and handling requests from browser and database etc.
  • The concept of DOM is not used
  • Developed by Ryan Dahl
  • Launched in 2009
  • Used in server-side
  • Node js is written in C, C++, and JavaScript language
  • Used to create scalable HTTP server which can use simple HTTP server or express module
  • Supports only web
  • Micro-services and API can be created with Node js

Zlib modules in Node js

Usage and Definition of Zlib

The Zlib module makes it possible to zip and unzip files.


The following is the syntax for incorporating the Zlib module into your application:

var zlib = require('zlib');

Methods and Properties of Zlib

constantsReturns a list of Zlib constants as an object in Node js.
createDeflateRaw()Creates a DeflateRaw object createGunzip()- Creates a Gunzip in Node js
object createGzip()Creates a Gzip object in Node js
createInflate()Creates an Inflate object in Node js
createInflateRaw()Creates an InflateRaw object in Node js
createUnzip()Deflates an InflateRaw object in Node js
deflate()Compress a string or buffer with Deflate
deflateSync()Compress a string or buffer with Deflate
deflateRaw()Compress a string or buffer with DeflateRaw
deflateRawSync()Compress a string or buffer with DeflateRaw in Node js
gunzip()Compress a string or buffer with DeflateRaw in Node js
deflateRawSync()Compress a string or buffer with Deflate in Node js
gunzipSync()Using Gunzip, compress a string or buffer in a synchronized manner.
Sync()It compresses a string or buffers in a synchronized manner using Gzip.
Inflate()It decompresses a string or buffers in a synchronized manner using Inflate.
inflateSync()Decompress a string or buffer using Inflate 
inflateRaw()Decompress a string or buffer using InflateRaw 
inflateRawSync()Decompress a string or buffer using InflateRaw
inflateSync()Decompress a string or buffer using Inflate 
unzip()Using Unzip unzip, decompress a string or buffer. 
unzipSync()uses Unzip to decompress a string or buffer in a synchronized manner.
methods of Zlib module


This was all about the Zlib module in Node js. If you have any query related to Node js Zlib modules or JavaScript, do drop it down in the comment section also do check out codedamn courses if you want to learn more about JavaScript and Node js with its use cases and amazing projects.

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