Developer Tools
JSON Formatter
Paste JSON to pretty-print it with clean indentation, validate it (with clear error messages) or minify it to a single line. Everything runs in your browser — your data is never uploaded.
Frequently asked questions
Is my JSON sent to a server?
No. The formatting, validation and minifying all happen locally in your browser using the built-in JSON engine, so your data never leaves your device.
What happens if my JSON is invalid?
The tool shows the exact parser error message so you can find the problem — for example a missing comma, an unquoted key or a trailing bracket.