JSON Lint
Validate JSON, spot parse errors, and pretty-print valid input.
Everything runs in your browser. Nothing is sent to the server.
Result
WaitingPaste JSON to see the result
Valid JSON will be formatted here. Parse errors will show immediately.
What it does
This tool is for quickly checking whether a JSON string is valid and formatting it in a readable way. It is useful for API responses, config files, and debugging payloads.
How to use it
- Paste JSON into the input box.
- Review the live validation status.
- Copy the pretty-printed result when the input is valid.
Tips
- Invalid JSON is shown with the parser message.
- The output is pretty-printed with two-space indentation.
- Copy will use formatted JSON when available.