About this tool

Paste any JSON on the left and it is parsed as you type. Valid JSON is pretty-printed with syntax highlighting and a key count, ready to copy; invalid JSON shows the exact line and column of the syntax error so you can fix it fast. Switch to Minify to collapse the same JSON to a single compact line, useful before pasting into a config file or API payload.

Everything runs locally in your browser — nothing you paste here is uploaded anywhere.