Cloudflare limitation: A JSONhalt Worker cannot open a connection to a host that is itself behind Cloudflare. Those hosts will appear unreachable rather than reporting a closed or rejected connection. If you see “host unreachable” for a known Cloudflare- fronted service, that is a platform limitation, not a port-block or firewall on your side.

Single fetch only: The tool fetches the URL exactly once. It does not follow links found in the response body, crawl endpoints, or retry on failure. What the server returned is what is reported, including non-2xx status codes.

Pasted text stays in the browser: Text you paste into the Text mode input is parsed by JSON.parse() in your browser. It is never sent to any server, logged, or stored. The URL mode sends only the URL you provide to the API—the response body is fetched and analysed by the server.