data tool
JSON Validator
Check whether a JSON payload is syntactically valid before sending it to an API.
Paste data here. It stays in your browser.
Copy-ready result appears here.
How it works
- Runs JSON.parse in your browser.
- Returns a valid message or parser error.
- Never uploads the payload.
Common use cases
- Validate config files.
- Check webhook samples.
- Debug API request bodies.
Code example
JSON.parse(input)Syntax validation
This validator checks whether the input can be parsed as JSON. It does not validate business rules, schemas, or API-specific requirements.
Common failures
Trailing commas, unquoted keys, single quotes, and comments are common reasons JSON parsing fails.
FAQ
Is my input uploaded?
No. This MVP runs tool logic in your browser and does not send tool input to a server.
Can I use this on mobile?
Yes. Pages are mobile-first and designed for quick copy, paste, and share workflows.
Does the tool store history?
No. The MVP does not store tool input history or create user accounts.
Should I verify important output?
Yes. These tools are designed for productivity, but production changes and financial decisions should be independently verified.
Can the tool run after the page loads?
Yes. The interactive logic runs in the browser once the static page and JavaScript island are loaded.
What input format should I use?
Use the examples on the page as a starting point, then replace them with your own local input.