Format and beautify JavaScript code — powered by js-beautify.
JavaScript Beautifier is a free online tool that formats and indents minified, obfuscated, or messy JavaScript code into a clean, readable structure. Powered by the js-beautify library, it handles all modern JavaScript syntax including ES6+ features, arrow functions, template literals, destructuring, and async/await patterns. The tool supports configurable indent sizes (2 spaces, 4 spaces, or tabs), adjustable line wrap lengths, and smart bracket handling. It preserves your code logic while restructuring the visual layout for maximum readability. Complex nested callbacks, promise chains, and class definitions are all formatted correctly. Readable JavaScript is critical for debugging, code reviews, and maintenance. When you encounter minified third-party code, obfuscated scripts, or auto-generated JavaScript from build tools, this beautifier makes it human-readable in seconds. It's also useful for standardizing code formatting across team members. Everything runs entirely in your browser using JavaScript. Your code is never sent to any server, never stored, and never logged. This makes it safe for proprietary code, client projects, API keys embedded in scripts, and any sensitive JavaScript. There are no file size limits, no usage caps, and no account required. Common use cases include reverse-engineering minified libraries, formatting webpack or rollup output, cleaning up legacy codebases, preparing code for documentation, and making bookmarklets readable. The tool shows statistics including input size, output size, line count, and processing time. You can copy the beautified result or download it as a .js file. For the reverse operation, use the JavaScript Minifier. To protect your code from reverse engineering, try the JavaScript Obfuscator.