What is JSON Formatter?
Make unreadable JSON readable. Paste it in to pretty-print with clean indentation, or minify it to strip every unnecessary byte. Invalid JSON produces a clear error message describing what went wrong and where.
How to use JSON Formatter
- Paste your JSON into the box.
- Click “Pretty-print” to format it with indentation, or “Minify” to compress it.
- If it is invalid, read the error message to find the problem.
- Copy the result when you are done.
Why use this tool?
Validation you can act on
Errors report the specific problem rather than a generic failure, which makes finding a missing comma or bracket much faster.
Safe for sensitive payloads
API responses often contain tokens and personal data. Because formatting is local, none of it reaches a third-party site.
Frequently asked questions
Why is my JSON invalid?
The usual culprits are trailing commas, single quotes instead of double quotes, unquoted keys, and comments — none of which JSON permits.
When should I minify?
Minify for production payloads and config files where size matters. Keep pretty-printed JSON in source control, where readable diffs are worth more than saved bytes.