UtilityBaseDeveloper Tools
JavaScript Beautifier
Beautify messy or minified JavaScript, or minify it with Terser — byte savings shown.
Updated July 10, 2026
How to use the javascript beautifier
- 1Paste your JavaScript into the input.
- 2Keep Beautify to format it, or choose Minify to compress.
- 3Read the result and any byte savings.
- 4Copy the output.
Common uses
- Making a minified bundle readable
- Formatting messy JavaScript consistently
- Minifying a script for production
- Tidying a snippet before sharing
Frequently asked questions
Can this un-minify JavaScript?
Yes. Paste minified JavaScript and beautify reformats it with proper indentation and line breaks, making a compressed bundle readable so you can understand or debug it. Note it can't recover original variable names that a minifier renamed.
How does it minify?
Minify uses Terser, the standard JavaScript minifier, to remove whitespace and comments and shorten the code. The tool shows the byte savings so you can see the reduction.
Is my code uploaded?
No. Both beautifying and minifying run entirely in your browser, so your JavaScript is never sent anywhere. It's safe for proprietary or unreleased code.
About this tool
The JavaScript beautifier reformats minified or messy JavaScript with clean indentation and line breaks so you can read and debug it, using js-beautify. Switch to minify and it compresses your code with Terser, the standard minifier, showing the bytes saved. The same tool also formats HTML and CSS. It's ideal for making sense of a minified bundle or tidying a snippet, and nothing is uploaded — your code stays in your browser.
Like most tools on UtilityBase, the javascript beautifier runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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