Paste any JSON and this tool instantly formats it with clean indentation, or flags exactly where it breaks. A JSON formatter turns a dense, single-line blob into a readable, indented structure so you can scan nested objects and arrays at a glance. Essential when debugging API responses or config files. It also works as a validator: if your JSON has a stray comma, unquoted key or missing bracket, you get a clear error instead of a silent failure. Everything runs locally in your browser, so even sensitive payloads never touch a server. Use the buttons to beautify with 2-space indent, minify to a compact single line, or validate without changing anything.