ParcelJS web application bundler Introduction

ParcelJS bunder comparsion with webpack

Bundler task is to bundle your application assets like HTML, Javascript, and CSS, and dependencies and output into files We have a lot of web applications popular bundlers like webpack, Browserify, and rollup? then why was parcelJS introduced?. With webpack, we have a lot of configurations and complex setup. The parcel has zero-based configuration and performance is good compared with existing bundlers.

Parcel Inbuilt features

  • Fast performance as it runs the tasks in parallel using multi-core processors and caching support
  • Integrated inbuilt support for javascript, CSS, HTML and images, other UI assets. Extra Plugins are not required
  • Zero or minimal configuration
  • Detailed error logging mechanism
  • Hot Module replacement.

Difference between ParcelJS and Webpack



Complex to set up for a simple application

Easy to Setup

Complex configuration

Zero-based configuration

Default provides input and output file, Extra plugin setup required to have support html/css/scss/js/images/Es6/Typescript

Inbuilt support for HTML/CSS/SCSS/js/Images/typescript

You need to configure the development server.

Default supports development Server.

Performance is good

Best performance compared with Web pack because of caching and code-splitting features.

Strong community support and stable

Emerging now a with active community

Setup/Install ParcelJS

There are two ways we can install for any web application
Using Yarn too

yarn global add parcel-bundler  

Using NPM tool

npm install -g parcel-bundler  

To check parcelJs installation executes below command.

B:\Workspace\parcel>parcel --version  

Parcel Hello World Demo Application

To create an empty project, FIrst, we need to have package.json in your project home directory. To create it, Use the yarn or npm command to generate it.

yarn init -y  
npm init -y  

It generates a package.json file as follows.

  "name": "parcel",  
  "version": "1.0.0",  
  "description": "",  
  "main": "index.js",  
  "scripts": {  
    "test": "echo \"Error: no test specified\" && exit 1"  
  "keywords": [],  
  "author": "",  
  "license": "ISC"  

You need to supply the entry point for the parcel command, For that create an index.html file like below.

      <script src="./index.js"></script>  
console.log('Parcel Testing application')

The development server is required to run this code, Parcel has an inbuilt dev server.

parcel index.html  
Server running at http://localhost:1234  
Built-in 1.11S  

parcel commands Basic syntax

parcel {options} {Commands}  

Learn Options and commands

Parcel Options Infomation



--version or -V

print Version information to console

--help or -h

Syntax information

Parcel Commands Infomation




Execute Development Server


the changes for reloading content without restarting the server

Production build

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