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Free JavaScript Beautifier

Format and beautify JavaScript code instantly. Clean up minified JS, fix indentation, and improve code readability for better debugging and maintenance.

Last Updated: 15 Jan 2026

Minified / Messy JS

Beautified JS

What is JavaScript Beautification?

JavaScript beautification is the process of formatting JavaScript code to improve readability and maintainability. When JavaScript is minified or obfuscated for production, all whitespace, line breaks, and often variable names are removed or shortened to reduce file size and protect intellectual property. While this improves load times, it makes the code nearly impossible for humans to read or debug.

JavaScript beautifiers reverse this process by adding proper indentation, line breaks, and consistent spacing. This transforms compressed, single-line JavaScript into well-structured, readable code that developers can easily understand, debug, and maintain.

Why Use Our Free JavaScript Beautifier?

Instant Formatting

Beautify JavaScript instantly as you paste. No delays, no server requests. All processing happens in your browser for maximum speed and privacy.

Proper Structure

Automatically indent functions, objects, arrays, and control structures to show code hierarchy clearly. Makes it easy to identify nested blocks and scopes.

Better Debugging

Well-formatted JavaScript is easier to debug, edit, and maintain. Quickly locate bugs, understand code flow, and fix issues in readable code.

Common Use Cases for JavaScript Beautification

Development Workflow

Debugging Minified Code
Beautify minified JavaScript from production to identify bugs, understand logic flow, or analyze third-party scripts.
Code Review
Format JavaScript before code reviews to make it easier for team members to understand logic and provide feedback.
Learning JavaScript
Beautify JavaScript from websites or libraries to study structure, learn patterns, and understand how code is organized.

Code Maintenance

Legacy Code Refactoring
Format old or poorly formatted JavaScript files to make them maintainable and easier to refactor or update.
Documentation
Beautify JavaScript examples in documentation, tutorials, or blog posts to make code snippets readable and professional.
Third-Party Script Analysis
Format JavaScript from CDNs, npm packages, or external libraries to understand their functionality and integration.

How JavaScript Beautification Works

Parse JavaScript Syntax

The beautifier parses your JavaScript to understand the code structure, including functions, objects, arrays, control structures, and expressions.

Apply Formatting Rules

Based on JavaScript syntax rules, the tool adds consistent indentation, line breaks between statements, and proper spacing around operators and keywords.

Handle Nested Structures

Nested functions, objects, arrays, and control structures are properly indented to show code hierarchy and scope levels clearly.

Output Formatted Code

The beautified JavaScript is output with proper line breaks, indentation, and spacing, making it easy to read, understand, and debug.

Frequently Asked Questions

What does JavaScript beautification do?

JavaScript beautification formats your JS code by adding proper indentation, line breaks, and spacing. It transforms minified or obfuscated JavaScript into readable, well-structured code that's easier to understand, debug, and maintain.

Will beautifying JavaScript change how it works?

No, JavaScript beautification only changes whitespace and formatting. The code functionality remains identical. JavaScript parsers ignore extra whitespace, so formatting doesn't affect execution or behavior.

Can I beautify ES6+ modern JavaScript?

Yes, our JavaScript beautifier supports all modern JavaScript features including ES6+ syntax, async/await, arrow functions, classes, modules, destructuring, and template literals.

Is my JavaScript code secure when using this tool?

Yes, all JavaScript beautification happens entirely in your browser using JavaScript. Your code never leaves your device, ensuring complete privacy and security.

Does beautifying JavaScript affect performance?

Beautified JavaScript has more whitespace, so file sizes are slightly larger. However, this only matters for production. Use beautified JavaScript for development and minify before deploying to production.

Can I beautify TypeScript or JSX?

Our JavaScript beautifier works with standard JavaScript. For TypeScript files, compile to JavaScript first. For JSX/React code, use a dedicated JSX beautifier that understands React syntax.

What if my JavaScript has syntax errors?

The beautifier will attempt to format the JavaScript, but malformed code (missing brackets, unclosed strings) may not format correctly. Fix syntax errors for best results.

Does it support modern ES6+ features?

Yes, our JavaScript beautifier fully supports modern JavaScript features including ES6+ syntax, async/await, arrow functions, classes, modules, destructuring, and template literals.