Output appears here...How to use
01
Paste the minified code
Drop the script into the Input pane. The Try sample button loads a squashed one-liner so you can see the expansion instantly.
02
Click Beautify
The code re-flows with two-space indentation, one statement per line, and braces where you expect them. Logic and behavior are untouched.
03
Read or copy the result
Study the structure right in the Output pane, or use Copy to move the formatted source into your editor for a proper investigation.
Why JS Beautifier
- Reformat minified JavaScript into readable, indented code.
- 2-space indent, sensible line breaks.
- Powered by js-beautify.
Common questions
Can beautifying recover the original variable names?
No, that information is destroyed during mangling. What you get back is layout: indentation, line breaks, and visible block structure. For real names you need the source map or the original repository. Even so, readable structure plus string literals is usually enough to follow the logic.
Is this js beautifier the same as a javascript formatter online like Prettier?
Close cousins. Prettier enforces a whole style across a project; this javascript formatter online applies clean default formatting to whatever you paste, with zero setup. Use your editor's formatter for code you maintain, and this page for code that just landed in front of you.
Why beautify a script before debugging it?
Breakpoints and stack traces are nearly useless on a one-line file. Once expanded, line numbers become meaningful, you can skim for the function that threw, and diffing two versions of a vendor script becomes possible. Browsers offer pretty-print in devtools, and this page does the same job when you want the code outside the debugger.
Does it execute or lint the JavaScript?
Neither. The tool rewrites whitespace and line structure only, so nothing runs and no warnings appear. That also means it's safe to paste code you don't trust yet; reading it here is exactly as inert as reading it in a text file.
What's the fastest way to format js code online?
Paste, click Beautify, copy. No account, no config file, no project setup. When you need to format js code online in the middle of an incident, the two panes here are quicker than opening an IDE.
Where should JSON be formatted instead of a js beautifier?
The JSON Formatter is the better fit: it validates syntax while formatting, catches trailing commas, and understands the stricter grammar. This page treats JSON as JavaScript, which mostly works but won't warn you when the payload is invalid.