JSON Formatter & Validator
Readable JSON, precise validation. Your numbers stay intact.
Processed on your deviceFree · No account needed
How to use it
- Paste a JSON document.
- Choose indentation or compact output, then format and validate.
{"id":9007199254740993,"ok":true} keeps the exact ID when formatted.
Details & limits
100,000 characters; nesting limited to 100 levels. Number spelling, string values and duplicate keys are preserved.
Will large numbers lose precision?
No. The formatter validates JSON syntax without converting numeric tokens into JavaScript numbers. Original numeric spelling and duplicate keys are retained. A valid document is not a schema validation or a guarantee that duplicate keys are meaningful.