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FastAPI JWT Authentication Guide Demonstrates Five-Endpoint API

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A developer published a complete guide for implementing JWT authentication in FastAPI. The tutorial provides a single-file, 118-line solution with five API endpoints for login, user data, and protected routes. It utilizes modern libraries including PyJWT for token handling and Argon2 for password hashing. The guide emphasizes practical security by demonstrating common failure cases like expired or invalid tokens. It is tested with Python 3.12 and FastAPI 0.128.

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