About JS Beautifier

Beautify and format JavaScript code. Part of the DevTools Surf developer suite. Browse more tools in the JavaScript collection.

Use Cases

• Frontend devs reformatting minified third-party library code for debugging
• Code reviewers standardizing JavaScript formatting before reviewing PRs
• Legacy codebase maintainers cleaning up inconsistently formatted JS files
• Students learning JavaScript by reading well-formatted code examples

Tips

• Choose between Allman and K&R brace styles for your team standard
• Set max line length to keep beautified code readable
• Beautify minified vendor scripts to debug production issues

Fun Facts

• Brendan Eich created the first version of JavaScript in just 10 days in May 1995 at Netscape Communications.
• JSBeautifier.org, one of the first online JS formatting tools, launched around 2007 and popularized browser-based code formatting.
• Prettier, the opinionated code formatter, was released by James Long in 2017 and now formats over 20 languages beyond JavaScript.

FAQ

Which JS versions are supported?

ES2024+. Modern features (optional chaining, nullish coalescing, dynamic imports, top-level await) format correctly.

Does it handle JSX?

Separate mode. Toggle to JSX for React-style syntax. Without it, JSX throws parse errors because plain JS doesn't know about angle-bracket tokens.

TypeScript support?

Partial — types and annotations format but type-specific rules (consistent type imports, generic formatting) are better handled by Prettier or ESLint.

Is this Prettier?

Similar core, different project (js-beautify). Pre-dates Prettier; still used by many editors as the default JS formatter. Prettier has broader adoption today.