Format and prettify JavaScript code for better readability and maintainability.
JavaScript Input
Formatted Output
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How to Use
1
Paste JavaScriptPaste minified or unformatted JavaScript code into the Input field.
2
Configure optionsChoose indent size, brace style, and formatting preferences.
3
Click BeautifyThe formatted JavaScript appears in the Output with proper indentation and structure.
4
Copy resultUse the Copy button to copy the beautified code to your clipboard.
5
Review codeReview the readable code to understand and audit minified scripts.
📌 All processing is done locally using js-beautify. No code is uploaded to any server.
About JavaScript Beautifier
Working with code and configuration files often means switching between formats, encoding strings, or validating syntax. JavaScript Beautifier eliminates the need for desktop software or command-line utilities by giving you a clean, instant interface right in your browser. Paste your input, get your result — no accounts, no installations, no data leaving your machine.
Frequently Asked Questions
"Collapse" puts opening braces on the same line (K&R style): if (x) {. "Expand" puts each brace on its own line. "End-expand" puts only closing braces on new lines. Most JavaScript projects use "Collapse" (also known as K&R or Allman-variant).
JSLint Happy mode adds spaces inside function parentheses: "function (x)" instead of "function(x)". This satisfies the JSLint code quality tool's strict formatting rules, used in some older coding standards.
Yes, js-beautify supports modern JavaScript including ES6+ features like arrow functions, template literals, destructuring, and async/await. TypeScript may partially work but some TS-specific syntax might not format perfectly.
Yes. Beautifying minified code (from a CDN, for example) can make it readable for inspection and debugging. Note that variable names may still be shortened (obfuscated) — this tool only restores whitespace and structure, not original variable names.