API debugging
Make compact JSON responses easier to read while testing an API.
JSON formatter
See examples
Config cleanup
Validate a JSON config before copying it into a project.
About this helper
The JSON formatter parses your input using the browser's native JSON parser. Valid JSON can be pretty-printed with indentation or minified into a compact string. Invalid JSON shows a syntax message so you can fix it quickly.
Is my JSON sent to a server?
No. Formatting and validation happen locally in your browser.
Can it fix invalid JSON automatically?
No. It reports syntax errors, but it does not guess or rewrite malformed data.