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What this analyzer covers
For URLs, the tool runs a public reachability check, resolves forward DNS for the hostname, and—when a public IPv4 address is found—queries common DNS blocklist zones. Severity buckets group outcomes so you can scan incidents faster than opening three separate tabs.
For JSON, you get syntax validation with line and column hints plus a short formatted preview when the document parses—useful for webhook payloads and API fixtures.
Absolute URLs only
Paste full https:// or http:// URLs. Bare relative paths like /api/health are rejected on purpose: the checker needs a host to probe and resolve.
Privacy
Editing and conversion run in your browser for these workflows—nothing is uploaded to our servers for the core tool actions. Clear sensitive data on shared machines when you are done.