JSON Formatter
Format, beautify or minify JSON and download the result. Your text stays in your browser and is never uploaded.
How to use
- Paste your JSON.
- Pick an indentation style or Minify.
- Copy the result or download it as formatted.json.
Notes and limitations
- Formatting re-serialises parsed JSON: duplicate keys keep the last value and numbers beyond JavaScript precision (about 15-17 digits) may lose precision.
- Comments and trailing commas are not valid JSON and will be reported as errors.
- Very large documents depend on your device memory.
FAQ
Is my JSON uploaded?
No. Parsing and formatting happen locally in your browser.
Does formatting change my data?
Formatting only changes whitespace, and key order is preserved. See the precision note above for very large numbers.