Beautify
JavaScript Beautifier
Paste JavaScript on the left, hit Run, copy indented, scannable source you can actually debug. No Node, no pip, no Docker for a five-minute job. That is the javascript beautifier.
Drop a file on the left. Drafts stay in this browser. Shortcut: Ctrl or Cmd + Enter to run.
How this javascript beautifier works
- Paste or drop a .js file into the input on the left.
- Flip options if you see them (comments, indent, case). Defaults are the safe ones.
- Hit Run, or Ctrl / Cmd + Enter. Leave “Process on server” off unless you mean it.
- Read the status line, then copy, download, or jump to a related tool.
What this javascript beautifier is for
The file is already in front of you. You need to beautify it without opening a whole IDE profile. Paste, run, copy. Typical timing: after you paste a minified blob, a one-line log, or a vendor file you did not write.
You walk away with indented, scannable source you can actually debug.
What it will not pretend to be
This is not a full Prettier or php-cs-fixer project config. Team formatters still belong in git hooks. JavaScript minify has to respect strings, comments, and (ideally) regex literals. A blunt “delete all spaces” pass will corrupt code. WebBeautify uses a conservative pass, not a full compiler like Terser.
By default nothing leaves the tab. Tick “Process on server” only if you want to compare results or use gzip numbers that match the server library.
A practical way to use it
Drop a .js file onto the input or paste. Flip options if they are there. Run. Read the status line. Copy or download. Drafts stay on this device so a refresh does not punish you.
When you are done, hop a related tool instead of starting over: minify and beautify toss the file back and forth, format and validate often share a parser, convert wants valid input first.
The small print that saves a round-trip
JavaScript minify has to respect strings, comments, and (ideally) regex literals. A blunt “delete all spaces” pass will corrupt code. WebBeautify uses a conservative pass, not a full compiler like Terser.
You searched “javascript beautifier online.” You got an editor, not a login wall. That is the deal.
Frequently asked questions
What does JS beautify restore?
Indent and line breaks around { } ;. A minified function x(){return 1} becomes a small function you can read. It will not rename x back to calculateTotal. Those names are gone if a mangler ate them.
Will beautify undo Terser mangling?
No. a(b,c) stays a(b,c). Beautify only changes whitespace. Source maps are how you get real names back in DevTools. Pretty-print in Chrome is the same idea as this tool, inside the debugger.
Example?
Before: const t={ok:true,run:()=>1};. After: const t with ok and run on readable lines. You can finally see a missing comma.
Fun fact?
Fun fact: UglifyJS came out in 2010. Pretty-printing minified jQuery was a sport. The bundle got smaller; the debugging stories got longer. Beautifiers exist because that trade is still the job.
Can beautify break JS?
A clumsy beautifier that splits after return can trigger ASI. Prefer tools that treat return { as one thought. If output looks cursed, run it — do not assume pretty means safe.
Beautify vs formatter vs Prettier?
Prettier is an opinionated project tool (quotes, wrap, trailing commas). A beautifier is “make this blob indented.” If the team has Prettier, use it in git. Use beautify when the blob never saw your repo.
Should I beautify the whole vendor bundle?
You can. It will be huge and slow to scroll. Beautify the function you care about, or use DevTools pretty-print on the file tab. Whole-library beautify is a last resort.
What about TypeScript and JSX?
TS/JSX formatters here use the same brace-and-tag instincts. They will not type-check. interface and <Component /> still like indent. For production, keep tsc and ESLint in the repo.