uuutil ← all tools

JSON formatter

Paste JSON to pretty-print or minify it — pick the indent, optionally sort keys, and copy or download the result. Invalid JSON gets a precise error with line, column and a caret pointing at the spot.

Privacy ledger

Data acquired	None.
Libraries used	Lit 3 — bundled into the tool file itself.
Data stored	None.
Data transmitted	None.

Use it on your own page

Download the tool as a single self-contained HTML file: readable source with the Lit library included, zero network requests — it works opened straight from your disk, and you can customize everything.

Download as HTML file

Prefer the hosted widget? One script tag embeds it and stays up to date:

<script type="module" src="https://uuutil.com/tools/json-formatter.js"></script>
<uu-json-formatter lang="en"></uu-json-formatter>

Source license: MIT — free to use, modify and redistribute; keep the license notice in copies.