FAQ

Does my JSON leave the browser? Formatting and validation run locally. A URL in the input box is the exception: the browser requests that address directly, and the remote host can refuse the request.

Why did a URL fail? Many APIs omit the CORS headers a browser page needs. Download the file or paste the body instead.

What does Fix JSON change? It removes comments and trailing commas, turns single-quoted strings into double-quoted ones, and quotes bare object keys. It does not guess through arbitrary broken text.