There’s a funny moment in every API project. You send a request. It returns 200. JSON looks clean. Everyone nods. “Works.” And that’s exactly where things usually start going wrong. The clean illusion Tools like Hoppscotch are brilliant at what they do. Fast. Lightweight. Open-source. You send requests, tweak headers, manage collections, debug responses — all the good stuff. It’s the modern version of “does the API respond?” And that matters. Because without a tool like that, you’re basically copying cURL commands between tabs like it’s 2008. But here’s the uncomfortable part That one successful request? It proves exactly one thing: 👉 That exact request worked once. That’s it. It says nothing about: missing fields wrong data types extra whitespace invalid enums malformed payloads broken auth or the classic: “why is this returning 500?” And that’s not a tooling problem. That’s just how manual testing works. Where Rentgen shows up Rentgen starts right after that “it works” moment. Not to replace Hoppscotch.…