JavaScript Beautifier

Beautify and prettify JavaScript code instantly with our free online JS beautifier. Clean indentation, readable structure, and syntax highlighting. 100% client-side.

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About JavaScript Beautifier

JavaScript Beautifier is a free online tool that helps developers format and prettify JavaScript code instantly. All processing happens entirely in your browser — your code never leaves your device.

Features

Instant Beautification — Format minified JavaScript in milliseconds
Syntax Highlighting — Color-coded output for better readability
Customizable Indentation — Choose between 2 spaces, 4 spaces, or tab
Smart Brace Handling — Automatic indentation of blocks and functions
Comment Preservation — Keeps single-line and multi-line comments intact
String & Template Literal Support
Regex Literal Support
One-Click Copy & Download
Auto-Process on Paste
100% Client-Side — No server uploads

How to Use

Paste your JavaScript code into the input textarea
Select your preferred indentation style
Click the "Beautify JS" button
Review the syntax-highlighted output
Copy the formatted code or download it as a .js file

Common Use Cases

Debug minified production JavaScript
Format code snippets from tutorials or documentation
Prepare build-tool-generated code for reviews
Prepare JavaScript for presentations or blog posts
Format scripts from browser DevTools
Restore readability to compressed JavaScript

Frequently Asked Questions

What is a JavaScript beautifier?

A JavaScript beautifier is a tool that takes minified or poorly formatted JavaScript code and restructures it with proper indentation and line breaks.

Is my JavaScript code safe?

Yes. All processing happens in your browser. Your code is never sent to any server.

What indentation options are available?

You can choose between 2 spaces, 4 spaces, or tab characters.

Does the beautifier change my code functionality?

No. The beautifier only changes whitespace, indentation, and line breaks. The logic remains unchanged.

Can I use this tool offline?

Yes. Once the page is loaded, everything works locally in your browser.

Are modern JavaScript features supported?

Yes, including arrow functions, template literals, async/await, destructuring, and more.