Three Ways to Convert JSON to TypeScript. Only One Is Deterministic.

There are three ways to turn a JSON response into TypeScript interfaces. You can write them by hand, you can ask an LLM, or you can run the JSON through a deterministic converter. I've used all three. Two of them have failure modes that most people don't think about until they ship a bug. The manual approach: slow and accurate until it isn't Writing interfaces by hand works when you have three fields. It stops working around field fifteen. A Stripe charge object has 40+ properties. A GitHub pull