I built a JSON formatter that actually tells you WHERE your JSON broke

I've lost count of how many times I've pasted a blob of JSON into a terminal window and tried to make sense of it with python -m json.tool — only to get a cryptic error with no line numbers. So I built a small tool to fix that for myself: JSON Formatter & Validator . What it does Paste any JSON → instant pretty-print with syntax highlighting. If the JSON is broken, it shows exactly where the error is — key, line, position. There's also a Minify button for when you need to go the other direction (pasting into config files, API calls, etc.). That's it. No login. No email. No ads. No 3MB of JavaScript loading before you can use the thing. Why another JSON formatter? Because the good ones are buried behind signup walls or slow as hell. The fast ones are ugly and don't tell you where your JSON broke. I wanted something that: Loads in under a second on mobile Actually highlights which token is malformed Doesn't phone home with my API responses Try it 👉 billion-jsonformat.pages.dev Works on m