7 FastAPI Tips That Saved Me Hours of Debugging

7 FastAPI Tips That Saved Me Hours of Debugging Practical tricks I wish I knew before building my first FastAPI backend. I've been building APIs with FastAPI for over two years. Here are the tips that genuinely saved me from debugging headaches — especially the ones that aren't obvious from the docs. 1. Use response_model_exclude_unset for Partial Updates When building a PATCH endpoint, you want to update only the fields the client actually sent: from fastapi import FastAPI from pydantic import