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docs/FastAPI/03_data_validation___serialization__pydantic_.md
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layout: default
title: "Data Validation & Serialization (Pydantic)"
parent: "FastAPI"
nav_order: 3
---
# Chapter 3: Data Validation & Serialization (Pydantic)
Welcome back! In [Chapter 2: Path Operations & Parameter Declaration](02_path_operations___parameter_declaration.md), we learned how FastAPI uses type hints to understand path parameters (like `/items/{item_id}`) and query parameters (like `/?skip=0&limit=10`). We even saw a sneak peek of how Pydantic models can define the structure of a JSON request body.