JavaScript Beautifier

Beautify and prettify JavaScript code instantly with our free online JS beautifier. Clean indentation, readable structure, and syntax highlighting. 100% côté client, no data sent to servers.

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À propos JavaScript Beautifier

JavaScript Beautifier is a free online tool that helps developers format and prettify JavaScript code instantly. Whether you are working with minified production code, messy scripts from tutorials, or compressed bundles from build tools, this beautifier restores proper indentation and readable structure. Tout processing happens entirely in your browser — your code never leaves your device, ensuring complete privacy and security.

Fonctionnalités

Instant Beautification — Format minified or messy JavaScript with proper indentation in milliseconds
Syntax Highlighting — Color-coded output with keywords, strings, numbers, comments, and regex highlighted
Customizable Indentation — Choose between 2 spaces, 4 spaces, or tab characters
Smart Brace Handling — Automatically indents blocks, functions, and object literals correctly
Comment Preservation — Keeps both single-line (//) and multi-line (/* */) comments intact
String & Template Literal Support — Properly handles single quotes, double quotes, and template literals
Regex Literal Support — Correctly identifies and preserves regular expression patterns
One-Click Copier & Télécharger — Copier formatted code to clipboard or download as a .js file
Auto-Process on Paste — Automatically beautifies code when you paste long scripts
100% Client-Side — Non server uploads, your code stays private and secure

Comment utiliser

Paste or type your JavaScript code into the input textarea
Sélectionner your preferred indentation style: 2 spaces, 4 spaces, or tab
Click the "Beautify JS" button to format your code instantly
Review the syntax-highlighted output with proper indentation and structure
Copier the formatted code to your clipboard or download it as a .js file

Common Use Cases

Debug minified production JavaScript by restoring readable indentation and structure
Format code snippets copied from Stack Overflow, tutorials, or documentation
Clean up JavaScript generated by build tools or transpilers for code review
Prepare JavaScript for presentations, blog posts, or educational materials
Format scripts extracted from browser DevTools or third-party sources
Restauration readability to compressed or obfuscated JavaScript for analysis

Frequently Asked Questions

Quoi is a JavaScript beautifier?

A JavaScript beautifier is a tool that takes minified, compressed, or poorly formatted JavaScript code and restructures it with proper indentation, line breaks, and spacing. Ceci makes the code easier to read, debug, and maintain without changing its functionality.

Is my JavaScript code safe when using this tool?

Oui, absolutely. Tout beautification happens entirely in your browser using JavaScript. Your code is never sent to any server, ensuring complete privacy and security.

Quoi indentation options are available?

You can choose between 2 spaces, 4 spaces, or tab characters for indentation. Ceci lets you match your team's or project's coding style preferences.

Does the beautifier change my code's functionality?

Non. The beautifier only changes whitespace, indentation, and line breaks. It does not modify any logic, variable names, or code structure that would affect how the code runs.

Can I use this tool offline?

Oui. Once the page is loaded, all operations work locally in your browser. Non internet connection is required after the initial page load.

Does the beautifier support modern JavaScript (ES6+)?

Oui, the beautifier handles modern JavaScript syntax including arrow functions, template literals, async/await, destructuring, spread operators, classes, modules, and more.

Can I download the beautified code as a file?

Oui. After beautifying, click the Télécharger button to save the result as a .js file. You can also use the Copier button to copy the formatted code to your clipboard.

Quoi types of strings does the beautifier handle?

The beautifier properly handles single-quoted strings ('), double-quoted strings ("), and template literals (`) including those with embedded expressions (${...}).