JSON
JSON Validator
Validate JSON before using it in code, APIs, or config files. Errors and previews are produced locally.
Runs locally in your browser. Your input is not uploaded.
How this tool works
JSON validation checks whether text can be parsed by the standard JSON parser.
When the input is valid, the tool also shows a formatted preview for easier inspection.
Examples
- Check a webhook payload before sharing it with a teammate.
- Validate a package-like config snippet before saving it.
Common use cases
API payload checks
Configuration files
Webhook debugging
FAQ
Can this validate JSON with comments?
No. Standard JSON does not allow comments, so commented JSON will be reported as invalid.
Does validation upload my data?
No. JSON parsing happens in the browser.