Structured Outputs: How to Make an LLM Return Clean JSON Every Time
Posted on Tue 27 October 2026 in Tutorial • Tagged with GenAI, LLM, structured-outputs, JSON, Pydantic, FastAPI, Python
The Bug That Taught Me This
The first time I built something that fed LLM output into other code, it worked beautifully for about a day. Then one response came back as:
Sure! Here's the JSON you asked for:
{"category": "billing", "priority": 2}
Let me know if you need …Continue reading