FileBrixNo upload · Private
Processed locally — your file never leaves your device

JSON Validator

Check whether JSON is valid, with a clear error message if it isn't — entirely in your browser.

How it works

  1. Paste JSON, or open a .json file.
  2. Click Validate.
  3. A specific parse error is shown if the JSON is invalid; otherwise you'll see a confirmation.

Frequently asked questions

Is my JSON uploaded anywhere?
No. Validation happens locally using your browser's own built-in JSON parser.
What do I get if the JSON is invalid?
The specific parse error (for example, a trailing comma or an unquoted key), rather than a generic failure message.
Does this check against a schema?
No — it checks JSON syntax only, not the shape or types your application expects (that would need a JSON Schema validator).
Can I open a file instead of pasting?
Yes, there's an Open file button, or you can paste text directly.