JSON Formatter
Format, validate, and minify JSON data.
About JSON Formatter
Format, beautify, validate, and minify JSON online for free. Paste messy or minified JSON and instantly get clean, properly indented output that's easy to read, or compress it back down to a single line for production. The built-in validator points out syntax errors - trailing commas, missing quotes, unbalanced brackets - as soon as they appear, so you can debug API responses and config files fast. All parsing happens in your browser, so even sensitive payloads never leave your machine.
How to use this tool
- 1Paste your raw JSON into the input box.
- 2Click Format to pretty-print it with indentation.
- 3Click Minify to compress it onto a single line.
- 4Any syntax errors are shown immediately below the input.
Frequently asked questions
Is my JSON data uploaded anywhere?
No. Formatting and validation happen entirely in your browser, so your data never leaves your device.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points to the problem location.