Question 1

How to implement JWT authentication in FastAPI with FastAPI-Login?

Accepted Answer

Start by installing the library, setting up a LoginManager with a secret key, defining a user_loader callback for user retrieval, and using the manager as a dependency in protected routes. The README provides a step-by-step example with OAuth2PasswordRequestForm for login endpoints.

Question 2

FastAPI-Login vs FastAPI-JWT: which is better for simple authentication?

Accepted Answer

FastAPI-Login is more minimal and inspired by Flask-Login, focusing on ease of use with dependency injection, while FastAPI-JWT might offer more JWT-specific features but less integration simplicity. Choose FastAPI-Login if you prefer a lightweight, straightforward approach similar to Flask patterns.

Question 3

Can FastAPI-Login handle cookie-based sessions securely?

Accepted Answer

Yes, it supports cookie authentication by setting use_cookie=True in LoginManager, with HTTPOnly flags for security. The set_cookie method helps attach tokens to responses, as documented in the cookie usage section.

Question 4

How to integrate FastAPI-Login with SQLAlchemy for user management?

Accepted Answer

You need to implement the user_loader callback to query your SQLAlchemy models, as the library doesn't provide built-in ORM support. Example code in the documentation shows how to adapt the fake database example to real databases.

Question 5

Does FastAPI-Login support refresh tokens for longer sessions?

Accepted Answer

No, it primarily focuses on access tokens with configurable expiration via expires_delta. For refresh tokens, you'd need to implement additional logic manually, as it's not included in the core features.

Question 6

How to handle authentication errors like invalid credentials in FastAPI-Login?

Accepted Answer

Use custom exceptions like InvalidCredentialsException and define handlers with app.add_exception_handler. The README demonstrates this with NotAuthenticatedException for redirecting unauthenticated requests.

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