JavaScript Beautifier
Paste minified JS, get clean readable code. Runs entirely in your browser - nothing is sent to any server.
How to Use JavaScript Beautifier - Format Minified JS Code
Paste minified JavaScript and instantly get clean, readable formatted code. 100% client-side - your code never leaves your browser.
Type directly into the input field, paste from your clipboard, or upload a file. The tool accepts a wide range of inputs and handles edge cases automatically.
Click the action button or watch as the tool processes your input in real time. All computation happens locally in your browser - nothing is sent to any server.
Copy the output to your clipboard with one click, or download it as a file. Your data stays private throughout the entire process.
Why Choose PrivConvert?
Unlike other online tools that upload your files to remote servers, store them for days, and may use them for AI training or data mining, PrivConvert was built with privacy as the foundation.
Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.
All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.
Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.
Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.
Trusted by Thousands of Users
PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.
Frequently Asked Questions
Is JavaScript Beautifier - Format Minified JS Code free to use?
Yes, completely free with no limits, no sign-up, and no hidden fees. Use it as many times as you want.
Is my data safe?
All processing happens directly in your browser. Your data is never sent to any server, never stored, and never shared. It's 100% client-side.
Does it work on mobile devices?
Yes. The tool works on any device with a modern web browser - smartphones, tablets, laptops, and desktops.
Do I need to create an account?
No. You can use the tool instantly without signing up, providing an email, or creating any profile.
Reading bundled and minified JavaScript
Shipped JavaScript has been through a bundler and a minifier: whitespace gone,
variables renamed to single letters, modules concatenated. Re-indenting restores
the block structure, which is usually enough to follow the control flow of a
function even when every identifier is called t.
What beautifying cannot restore is names. Minification is lossy — once
userAccountBalance became t, the original is gone unless
a source map was published alongside. If one was, loading it in dev tools gives
you the real source, which is far better than reading formatted output.
Where the semicolons come back
Minifiers strip optional semicolons and rely on automatic semicolon insertion.
A beautifier that re-adds them is making a judgement about where statements end,
and in the few genuinely ambiguous cases — a line starting with ( or
[, a return followed by a newline — that judgement can
differ from the engine's. Treat beautified output as something to read rather
than something to run.
A note on what you are reading
Bundled code you did not write is a reasonable thing to inspect — checking what a third-party script sends, auditing a dependency, understanding a bug in a library. Do check the licence before reusing anything you find, since minification removes copyright headers along with everything else, and the absence of a notice is not the absence of a licence.
Formatting happens entirely in your browser.