🚀 How to Use This Tool

1. Input your code: Paste JavaScript, JSX, TypeScript, or HTML containing script tags directly into the input editor. Use the Upload button to load files from your computer, or Load from URL to import code from a web address.
2. Choose formatting preferences: Select your preferred indentation style (2 spaces, 4 spaces, or tabs) and brace placement convention (K&R for compact style, Allman for braces on new lines, or End-expand for a hybrid approach).
3. Validate syntax (optional): Click Validate Syntax to check for JavaScript errors before processing. This helps catch issues like missing brackets or syntax problems.
4. Transform your code: Click Beautify to format messy code with proper indentation and structure. Use Minify to compress code for production by removing whitespace and comments. Select an obfuscation level and click Obfuscate to protect your code with security transformations.
5. Deobfuscate complex code: Paste obfuscated JavaScript and click Deobfuscate to decode strings, format structure, and improve readability for analysis.
6. Create standalone scripts: Use Self-Contained Script to convert HTML with multiple script tags into a single, portable JavaScript file wrapped in closures.
7. Export results: Download the transformed code as a file (automatic .js or .html extension), or copy to your clipboard using the toolbar Copy button.

✨ What Problems Does This Tool Solve?

• Messy code readability: Instantly transform compressed, minified, or poorly formatted JavaScript into clean, professional code with consistent indentation and spacing—saving hours of manual reformatting.
• Team collaboration conflicts: Enforce unified coding standards across your team by formatting all code with consistent style conventions, eliminating debates over tabs vs. spaces and brace placement.
• Production optimization: Reduce JavaScript file sizes by 30-60% through minification, dramatically improving page load times, reducing bandwidth costs, and enhancing user experience.
• Code security and IP protection: Protect proprietary algorithms, business logic, and intellectual property from casual theft through advanced obfuscation techniques that make reverse engineering extremely difficult.
• Legacy code analysis: Deobfuscate and format third-party libraries, inherited codebases, or production scripts to understand functionality, debug issues, or assess security risks.
• Complex HTML processing: Automatically extract and format JavaScript from HTML templates, WordPress themes, email templates, or legacy web pages without manual extraction.
• Dependency consolidation: Convert multi-file HTML applications with external script dependencies into single, portable, self-contained JavaScript files for easy distribution or embedding.

🎯 Key Features & Capabilities

• Three-level obfuscation system: Choose Low (basic variable renaming, minimal performance impact), Medium (string encoding + dead code injection, balanced protection), or High (control flow flattening + debug protection, maximum security).
• Intelligent HTML script detection: Automatically identifies and processes JavaScript within HTML script tags, handling inline code, external references, async/defer attributes, and mixed content seamlessly.
• Self-contained script conversion: Transforms HTML with multiple script tags into isolated, closure-wrapped JavaScript modules that prevent global scope pollution and work as standalone files.
• Real-time syntax validation: Verify JavaScript syntax before processing to catch errors like missing brackets, malformed statements, or invalid expressions.
• Multiple formatting styles: Full support for K&R (Kernighan & Ritchie), Allman, and End-expand brace styles with customizable indentation (2/4 spaces or tabs).
• Compression analytics: Real-time statistics showing original vs. compressed file size and percentage reduction after minification.
• URL import capability: Load JavaScript files directly from web URLs for quick formatting, analysis, or obfuscation of remote code.
• Modern syntax support: Handles ES6+ features including arrow functions, destructuring, async/await, template literals, classes, and modules.
• 100% client-side processing: All transformations occur in your browser—no code uploads, complete privacy, works offline, no file size limits.

🔐 Understanding Obfuscation Levels

• Low Protection: Renames variables to hexadecimal identifiers, enables string array rotation, compact output format. Minimal file size increase (~10-20%), negligible performance impact. Best for: basic protection of non-critical code, learning purposes, or when performance is paramount.
• Medium Protection: Adds control flow flattening (50% threshold), dead code injection (20% threshold), string array encoding (Base64), object key transformation, console output disabling, self-defending code. Moderate file size increase (~40-70%), slight performance impact. Best for: production code with proprietary logic, commercial applications, client-side validation routines.
• High Protection: Maximum control flow flattening (75% threshold), aggressive dead code injection (40% threshold), RC4 string encryption, debug protection with interval checks, unicode escape sequences, enhanced string array wrapping. Significant file size increase (~80-150%), noticeable performance impact. Best for: highly sensitive algorithms, licensing systems, DRM implementations, security-critical code.

📚 Frequently Asked Questions

What is a JavaScript formatter and why should I use one?

A JavaScript formatter is an essential development tool that automatically organizes your code with consistent indentation, spacing, and line breaks. It solves the critical problem of code readability—transforming messy, compressed, or inconsistently styled JavaScript into clean, professional code. This dramatically improves maintainability, reduces debugging time, helps teams collaborate with unified coding standards, and makes code reviews significantly faster. Our formatter supports industry-standard styles including K&R (Kernighan & Ritchie), Allman, and End-expand brace conventions, plus customizable indentation (2 spaces, 4 spaces, or tabs) to match your project requirements.

How does JavaScript obfuscation protect my source code from theft?

JavaScript obfuscation transforms your readable source code into functionally identical but extremely difficult-to-understand code, protecting your intellectual property and business logic. Our obfuscator employs multiple advanced techniques: renaming all variables and functions to meaningless hexadecimal identifiers, encoding string literals with Base64 or RC4 encryption, flattening control flow structures to obscure program logic, injecting dead code branches that never execute, adding anti-debugging protections, and converting readable object keys to encrypted references. We offer three protection levels—Low (basic obfuscation with minimal performance impact), Medium (balanced protection with string encoding and dead code injection), and High (maximum security with control flow flattening and debug protection). While not unbreakable, proper obfuscation significantly increases the time and expertise required for reverse engineering, deterring most casual code thieves.

What is the difference between minification and obfuscation for JavaScript?

Minification and obfuscation serve completely different purposes. Minification focuses on file size reduction by removing all unnecessary characters—whitespace, line breaks, comments, and shortening variable names where safe—while keeping the code relatively readable for debugging. It typically reduces file size by 30-60% and improves page load speeds, making it ideal for production deployment. Obfuscation, conversely, prioritizes security over size by deliberately making code unreadable through variable renaming, string encoding, control flow manipulation, and protective layers. This often increases file size by 20-100% but protects proprietary algorithms and business logic. Best practice: use minification for all production code to optimize performance, and add obfuscation only for sensitive code sections containing valuable intellectual property, licensing logic, or security-critical functions.

Can this tool format JavaScript embedded inside HTML files?

Absolutely! Our formatter intelligently detects and processes JavaScript within HTML documents. Simply paste HTML containing script tags—whether inline JavaScript, external script references with src attributes, or mixed content—and the tool automatically extracts all script blocks, processes the JavaScript according to your chosen operation (beautify, minify, or obfuscate), and returns properly formatted results. It preserves HTML structure while transforming JavaScript content, handles multiple script tags in a single document, respects script attributes like async and defer, and works with both traditional script tags and modern module scripts. This makes it perfect for formatting embedded analytics code, processing WordPress templates, cleaning up legacy HTML pages, or preparing email templates with inline JavaScript.

How does the self-contained script conversion feature work?

The self-contained script converter solves a common problem: transforming HTML with multiple external JavaScript dependencies into a single, portable, standalone script file. It analyzes your HTML, identifies all script tags (both external and inline), and converts them into isolated, immediately-invoked function expressions (IIFEs) that prevent global scope pollution. External scripts are transformed into dynamic loaders that create script elements programmatically, while inline scripts are wrapped in closure functions to maintain encapsulation. This is invaluable for creating embeddable widgets, developing browser bookmarklets, distributing standalone tools without dependencies, converting multi-file applications into single-page scripts, and preparing JavaScript for environments with strict content security policies. The converted code maintains all functionality while becoming completely self-sufficient.

Is my code safe and private when using this JavaScript formatter?

Your code privacy is absolutely guaranteed. All processing occurs entirely within your browser using client-side JavaScript—nothing is ever uploaded to servers, transmitted over networks, stored in databases, or logged anywhere. Your source code never leaves your computer. This client-side architecture provides multiple benefits: complete confidentiality for proprietary code, works offline after initial page load, no file size limitations since processing uses your local computing power, instant results without network latency, and no account registration or data collection. You can verify this by monitoring network traffic (you will see zero outbound requests during processing) or by disconnecting from the internet after loading the page—the tool continues working perfectly. This makes our formatter ideal for processing confidential business logic, unreleased product code, security-sensitive scripts, and any proprietary JavaScript.

What file formats and code sizes does this formatter support?

We support a comprehensive range of JavaScript and related file formats: standard JavaScript (.js), ECMAScript modules (.mjs), React JSX components (.jsx), TypeScript files (.ts, .tsx), and HTML documents with embedded script tags. Since all processing happens client-side using your browser resources, there are absolutely no file size restrictions—the tool efficiently handles everything from tiny code snippets (a few lines) to massive production bundles (several megabytes). Performance depends on your device capabilities rather than server limitations. Modern browsers can process even 5-10 MB JavaScript files in seconds. The tool gracefully handles modern ES6+ syntax including arrow functions, destructuring, async/await, template literals, and class definitions, as well as legacy ES5 code.

Can heavily obfuscated JavaScript be completely reversed to original source code?

No, heavily obfuscated code cannot be fully restored to its original form—this is a critical limitation to understand. During obfuscation, certain information is permanently and irreversibly destroyed: original variable and function names are replaced with meaningless identifiers, all code comments and documentation are stripped, semantic naming that conveys intent is lost, and original code structure is deliberately scrambled. Our deobfuscator can improve readability by decoding encoded strings (hex, unicode, Base64), reformatting code with proper indentation and spacing, simplifying some basic transformations, and making control flow slightly more apparent. However, it cannot recover original names, restore comments, or undo advanced protections like control flow flattening. The deobfuscator is best used for analyzing and understanding unfamiliar obfuscated code, debugging minified production scripts, or educational purposes—not as a complete reverse engineering solution.

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