このツールとは？
The JSON formatter and validator pretty-prints JSON, validates it, or minifies it to one line.
なぜ使う？
Useful when you need to read API responses or config files, or to find syntax errors. Handy for development and debugging.
使い方
Paste JSON into the input, then click "Format" or "Validate". Copy the formatted result. Invalid JSON will show an error and position.
Processing is done only in the browser; JSON is not sent to the server.