JavaScript Beautifier
Paste minified JavaScript to get clean, indented, readable code. Everything runs in your browser, so your code never leaves your machine.
About the JavaScript Beautifier
The JavaScript Beautifier reformats minified or compressed JavaScript into clean, indented, readable code. It is built for developers who need to inspect a bundled script, debug third-party code, or review a build output. Everything runs entirely in your browser with a built-in formatter, so your code is never uploaded, logged, or executed. This is the reverse of a minifier: it adds back the whitespace and line breaks that make code easy to read.
How it works
- Paste minified or single-line JavaScript into the input area.
- Pick an indent size: 2 spaces, 4 spaces, or a tab.
- Read the formatted result on the right, with line and character counts in the status bar.
- Click Copy to grab the beautified code, or Clear to start over.
Features
- Indents by braces, brackets, and parentheses, and breaks lines after semicolons and opening braces.
- Selectable indentation: 2 spaces, 4 spaces, or tab.
- Preserves strings, template literals, regex literals, and comments instead of reformatting their contents.
- Runs entirely client-side with no external libraries, so nothing leaves your browser.
- One-click copy and a clear button, with live line and character counts.
Frequently asked questions
Is my code uploaded anywhere?
No. Formatting happens entirely in your browser using a built-in beautifier. Your code is never sent to a server, stored, or run.
How is this different from the JavaScript Minifier?
The minifier strips whitespace to make code smaller. The beautifier does the opposite: it adds indentation and line breaks to make minified code readable again.
Does it rename variables back to their original names?
No. Minifiers often shorten variable names to single letters, and that information is lost. The beautifier restores formatting and structure, but it cannot recover the original names or comments that were removed.
Will it break on unusual or invalid input?
It is built to never crash. The formatter does a best-effort pass and preserves strings, regex, and comments. If the input is malformed, you may see imperfect indentation, but the tool will still return output.
Does it work offline?
Yes. Once the page has loaded, formatting runs locally in your browser, so the tool keeps working without an active connection.