FastAPI Login API Tutorial | Verify User Password & Authenticate User

Описание: Welcome to another video of the FastAPI Series! 🌙

In this session, we’re building a Login (Sign‑In) API in FastAPI and understanding how to authenticate users by verifying their hashed passwords. 🔐👤

This video focuses on the complete login flow — fetching the user from the database, validating credentials, and returning proper HTTP responses for success and failure cases.

By the end of this lesson, you’ll understand:
✅ How a Login API works in FastAPI
✅ How to validate user input using Pydantic models
✅ How to fetch users from the database using SQLAlchemy Async
✅ How to verify hashed passwords using a Hash Service
✅ How to handle invalid email and incorrect password cases
✅ How to return correct HTTP status codes (200, 401, 404)
✅ How to design clean and secure authentication logic

With hands‑on code walkthroughs, clear explanations, and real database demos, you’ll gain the confidence to build secure and production‑ready login APIs using FastAPI. 🚀

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