JSON Validator
Verify that a JSON document is valid and inspect its structure at a glance: type, key counts and nesting depth. If something is wrong, the exact parser error is shown.
Free Runs in your browser No sign-up
Updated as you type
How to use
- Paste JSON
The check runs as you type.
- Read the verdict
Valid + structure stats, or the exact error.
- Fix and re-check
No data ever leaves your browser.
Supported formats
- Input: JSON
- Output: —
Limits & notes
- Validation uses the browser's native JSON parser — the same strictness as your code.