Stop parsing GPT's JSON by hand: structured output with the Responses API and Zod (opens in new tab)

I shipped a feature that sends a photo to a vision model and gets back structured feedback — three labeled fields, every time, no exceptions. The hard part wasn't the prompt. It was getting the model to return JSON I could actually trust without writing a defensive parser around every call. If you've ever written this, you know the pain: const text = response.choices[0].message.content; const json = JSON.parse(text); // 🙏 please be valid That line works in the demo and fails in production. Th...