Format messy JavaScript with custom indentation and brace styles, or minify to shrink file size. ES6+ supported. Runs entirely in your browser — your code never leaves your device.
JavaScript that ships in production looks nothing like JavaScript that humans write. Build pipelines compress whitespace, strip comments, and inline modules — great for bundle size, terrible when you're trying to read someone else's code in DevTools or a third-party widget. This tool reverses that, restoring readable structure with sensible defaults and configurable formatting rules.
The beautifier is powered by js-beautify, the same library used by VS Code, Sublime, Atom, and most popular online formatters. Everything runs locally in your browser via JavaScript — there's no upload step, no server round-trip, and no rate limit. Paste a 500KB minified bundle and it formats in milliseconds.
Collapse keeps { on the same line (K&R / standard JS). Expand puts { on its own line (Allman style). End-expand is a hybrid where else and catch get fresh lines.(, among other tweaks.\xNN and \uNNNN escapes back to their literal characters where safe./*! — the convention used by most libraries to mark MIT/Apache copyright headers that must remain in distributed code.; before }. Saves a byte. Disabled by default because it makes diffs noisier.This tool's minifier is intentionally conservative — it removes whitespace and comments only. It does not rename variables, mangle properties, or perform AST-level dead-code elimination. For aggressive optimization use terser or esbuild in your build pipeline.
No. All beautification and minification happens entirely in your browser using js-beautify loaded from a CDN. Your code never leaves your device.
Beautifying formats code with proper indentation and line breaks for human readability. Minifying removes whitespace, comments, and unnecessary characters to reduce file size for production deployment.
No. This tool performs whitespace and comment removal only. It does not rename variables, mangle identifiers, or perform AST-level optimizations. For that level of compression use Terser, UglifyJS, or esbuild in a build pipeline.
Yes. The beautifier supports modern JavaScript including arrow functions, template literals, async/await, classes, destructuring, spread/rest, optional chaining, and nullish coalescing.
Three styles: Collapse (opening brace on same line as the statement — standard JS style), Expand (opening brace on a new line — Allman / C# style), and End-Expand (opening on same line, but else and catch get new lines).
The beautifier preserves semantics — it only changes whitespace and indentation. The minifier is more aggressive but uses placeholder-based string and regex extraction so contents of strings, regex literals, and comments are never altered. Always test minified output before deploying.