How to use
- Paste or type JSON into the box.
- Choose an indent size.
- Click Format to beautify or Minify to compress.
- Copy or download the result.
JSON Formatter & Validator
Paste JSON to pretty-print, minify or validate it. Errors show the line and column.
Runs entirely in your browser. Nothing you enter is sent or stored.
Frequently asked questions
Is my JSON uploaded anywhere?
No. Formatting happens in your browser with JavaScript. Nothing is sent to a server.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes, or unquoted keys. The message shows the line and column of the first error.
How large a file can I format?
Several megabytes work fine on most devices because nothing is uploaded.