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Pydantic: Bulletproof Data Validation in Python
5 chapters20 pagesUpdated Jul 27, 2026
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Pydantic is Python's most popular data validation library, used by FastAPI, LangChain, and hundreds of major projects. Learn models, fields, validators, settings management, and how to integrate Pydantic v2 into real-world applications.
Table of Contents5 chapters
1Introduction to Pydantic
2Fields and Constraints
3Validators
4Settings Management
5Pydantic with LangChain and FastAPI