JavaScript Beautifier
Format, un-minify, or compact JavaScript & TypeScript code into clean, readable scripts with custom indentation. · Updated
JavaScript beautifying is how teams review minified CDN bundles, debug production stacks, and normalize style before diffs. Running js-beautify locally means proprietary app code never hits a remote formatter. Toggle Beautify vs Minify, tune indent size, and pair with Diff Checker when comparing before/after builds.
Common errors and fixes
Unexpected token
Check for missing commas, unclosed brackets, or truncated minified bundles before beautifying.
Unterminated string constant
Restore matching quotes. Escaped quotes inside strings must use \" or template literals.
Beautify produced little change
Confirm Mode is Beautify, not Minify. Increase indent size if output still looks dense.
JSX / TS syntax looks odd
Most ESNext and TS syntax is supported; exotic Babel plugins may need a dedicated formatter.
Options
| Option | Description |
|---|---|
| Mode | Choose whether to expand code into readable indented format or compact into a smaller footprint. |
| Indent size | Number of spaces per indentation level. |
| Space before conditionals | Formats as `if (condition)` rather than `if(condition)`. |
FAQ
Can this beautifier un-minify minified JavaScript code?
Yes. It restores structure, nested indentation, line breaks, and braces from single-line bundled or minified JS.
Does it support modern ES6+, TypeScript, and JSX syntax?
Yes. Arrow functions, async/await, optional chaining, template literals, and object destructuring are fully supported.
Can I use it to compress or minify JavaScript?
Yes. Selecting 'Minify (Compact)' mode strips comments and collapses whitespace safely.
What keyboard shortcut formats the code?
You can press ⌘+Enter (Mac) or Ctrl+Enter (Windows/Linux) anytime inside the editor to format instantly.