JavaScript Beautifier: Format ES6+ & JSX

Free JavaScript Beautifier & Minifier - Real-Time Format JS/JSX Code Online

Format JavaScript and JSX code instantly with our free online JavaScript beautifier featuring real-time auto-formatting, resizable split-screen panels, and minify options. Clean up minified bundles, normalize copied snippets, and debug production code with proper indentation—all processed securely in your browser without uploading code to any server.

Key Features

  • Real-Time Auto-Format - See formatted JavaScript instantly as you type or paste code
  • Beautify & Minify - Format for readability or minify to remove whitespace and comments
  • Resizable Split View - Adjust panel sizes with draggable handle for optimal workspace
  • Fullscreen Mode - Maximize input or output panels for focused editing
  • Indent Size Options - Choose 2, 4, or 8 spaces for indentation
  • JSX Support - Format React JSX and JavaScript with embedded XML syntax
  • Sample Code Generator - Load example JavaScript to test formatting
  • File Upload Support - Load .js, .jsx, or .mjs files directly from your computer
  • One-Click Download - Export formatted JavaScript as .js file
  • Copy to Clipboard - Copy formatted code with single click
  • 100% Client-Side - All processing happens locally in your browser, no code sent to servers
  • 1MB File Limit - Handle large JavaScript files up to 1MB

JavaScript Beautifier Comparison: SimplyUtils vs Competitors

Feature
SimplyUtils
JS Beautifier
Prettier Playground
Code Beautify
Real-Time Auto-Format
✓
✗
✗
✗
Resizable Split View
✓
✗
✗
✗
Fullscreen Panel Mode
✓
✗
✗
✗
Beautify & Minify
✓
✓
Format Only
✓
Indent Size Options
3 Options
2 Options
2 Options
2 Options
JSX Support
✓
✓
✓
Limited
Sample Code Generator
✓
✗
✗
✗
File Upload
✓
✓
✗
✓
Download Formatted File
✓
✓
✗
✓
Mobile Responsive
✓
Partial
Partial
Partial
Dark Mode
✓
✗
✗
✗
Max File Size
1MB
Unlimited
Limited
Limited
No Account Required
✓
✓
✓
✓

Why Choose SimplyUtils Over JS Beautifier

JS Beautifier (jsbeautifier.org) is a popular tool that offers both beautify and minify options with file upload support, but SimplyUtils provides a more modern experience with real-time auto-formatting that updates code instantly as you type or paste—no need to click a "Beautify" button every time. Our resizable split view lets you adjust panel sizes to match your workflow, and fullscreen mode maximizes either panel for focused work on complex JavaScript. SimplyUtils also offers 3 indent size options (2, 4, or 8 spaces) compared to JS Beautifier's 2 options, and includes dark mode support for comfortable long formatting sessions.

Why Choose SimplyUtils Over Prettier Playground

Prettier Playground requires manual formatting with a "Format" button for every change, while SimplyUtils offers real-time auto-formatting that updates code instantly as you type or paste. While Prettier Playground focuses purely on formatting, SimplyUtils provides both beautify and minify options in one tool. Our resizable split view adapts to your workflow, and fullscreen mode lets you maximize either panel for focused editing—both missing from Prettier Playground's fixed layout. SimplyUtils also includes file upload and download features that Prettier Playground lacks, making it easier to work with JavaScript files directly.

Why Choose SimplyUtils Over Code Beautify

Code Beautify provides basic JavaScript formatting with file upload, download, and both beautify and minify options, but the experience is basic with plain text output and manual formatting. SimplyUtils offers real-time auto-formatting that updates instantly as you type, making it much faster for quick formatting tasks. Our resizable split view adapts to your workflow whether you're on desktop or mobile, unlike Code Beautify's fixed layout. SimplyUtils also offers unique features like fullscreen mode for focused editing, 3 indent size options, sample code generator, and dark mode support—features that make a real difference when working with complex JavaScript code.

What Does a JavaScript Beautifier Do?

Beautifying JavaScript means rewriting only whitespace and formatting: indentation, line breaks, and spacing around operators, blocks, and object literals. The output is functionally equivalent to the input, but far easier to read, understand, and debug. A JavaScript beautifier does not change variable names, logic, or behavior—it only improves visual structure.

Beautify vs Minify JavaScript

SimplyUtils offers both beautification and minification for different use cases:

  • Beautify (Format) - Adds line breaks, indentation, and spacing for maximum readability
  • Minify - Removes whitespace and comments to reduce file size
  • When to Beautify - Debugging, code reviews, learning, refactoring, documentation
  • When to Minify - Compact storage, sharing snippets, embedded code, reducing file size

In production, bundlers like Vite, Webpack, and Rollup typically minify JavaScript automatically. This tool is ideal when you need to quickly format or minify a piece of code without changing project tooling, or when you need to unminify production code for debugging.

Common Use Cases

  • Debugging Production Code - Unminify production JavaScript to understand what's executing
  • Code Reviews - Normalize formatting before comparing changes
  • Learning from Examples - Expand minified JavaScript to understand patterns and techniques
  • Sharing Snippets - Readable code is easier to discuss in tickets, PRs, and chat
  • Working with JSX - Format React components with embedded XML syntax
  • Stack Trace Analysis - Make stack-trace snippets readable to find control flow
  • Legacy Code Cleanup - Standardize formatting across old codebases

Understanding JavaScript Formatting

JavaScript formatting rewrites code without changing its behavior:

  • Consistent Indentation - Adds proper spacing to show code structure and nesting
  • Line Breaks - Places statements and expressions on separate lines for readability
  • Brace Placement - Standardizes where opening and closing braces appear
  • Operator Spacing - Adds consistent spacing around operators (=, +, -, etc.)
  • Function Formatting - Formats function parameters and arrow functions consistently
  • Object Literal Formatting - Formats object properties with proper indentation

JavaScript Best Practices

  • Prefer Consistent Indentation - Choose 2 or 4 spaces and enforce it across the team
  • Keep Functions Small - Readability improves more from structure than whitespace alone
  • Use Descriptive Names - A clean formatter can't compensate for unclear variables
  • Limit Nesting - Early returns and helper functions reduce indentation depth
  • Format Before Committing - Run formatter on JavaScript files before version control commits
  • Use Modern Syntax - Arrow functions, destructuring, and template literals improve readability
  • Be Cautious with Copied Code - Ensure it's trusted before executing it anywhere

JSX Support

SimplyUtils handles JSX (JavaScript XML) syntax used in React components. Format React code with embedded XML-like syntax, including component tags, props, and nested elements. The beautifier preserves JSX structure while applying consistent indentation and spacing, making React components easier to read and maintain.

Indent Size Options Explained

SimplyUtils offers three indent size options to match your team's coding standards:

  • 2 Spaces - Compact indentation, popular in modern JavaScript and React development
  • 4 Spaces - Traditional indentation, easier to see nesting levels
  • 8 Spaces - Maximum visibility, useful for deeply nested structures

Formatting Tips for JavaScript Projects

  • Toggle "Auto-Format" off when pasting very large JavaScript files to prevent lag during paste
  • Use the resizable handle to adjust panel sizes based on your code complexity
  • Click fullscreen mode when working with complex JavaScript for better visibility
  • Load sample code to understand how different JavaScript structures format
  • Use "Minify" to create compact code for sharing snippets or documentation
  • Choose indent size (2, 4, or 8 spaces) based on your team's style guide
  • Upload .js, .jsx, or .mjs files directly instead of copy-pasting large files
  • Format before code reviews to ensure consistent style across changes

Privacy and Security

Many online beautifiers send code to a remote server for processing. If your JavaScript includes proprietary logic, internal URLs, API keys, or secrets, that's risky. SimplyUtils processes all JavaScript formatting locally in your browser using the js-beautify library—no code is transmitted to any server. Your JavaScript stays on your machine, making it safe to format sensitive code from production environments, internal tools, or proprietary applications.

When to Use This Tool

  • Quick Formatting - Format JavaScript without setting up project tooling
  • One-Off Tasks - Beautify code snippets from logs, chat, or documentation
  • Learning - Study well-formatted JavaScript to understand structure
  • Debugging - Unminify production code to understand execution flow
  • Code Sharing - Format code before sharing in tickets, PRs, or chat
  • No Build System - Format JavaScript when you don't have access to project tools

Whether you're switching from JS Beautifier, looking for a better alternative to Prettier Playground, or need more features than Code Beautify offers, SimplyUtils provides real-time auto-formatting, resizable panels, fullscreen mode, both beautify and minify options, JSX support, and complete privacy—all free with no sign-up required.