How would you implement JWT-based authentication in a Flask or FastAPI application?
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Implementing JWT Authentication in Flask and FastAPI: A Full-Stack Perspective
JSON Web Tokens (JWT) have become a standard for secure, stateless user authentication. According to the 2024 Stack Overflow Developer Survey, over 46% of backend developers reported using token-based authentication for web APIs, reflecting its popularity for modern web apps. JWTs encapsulate user claims in a signed token, eliminating the need to store session data on the server and improving scalability.
In Flask, you can integrate JWT using the Flask-JWT-Extended library. After installing the package, configure a secret key, create login routes that issue tokens upon valid credentials, and protect API endpoints with decorators like @jwt_required().
For FastAPI, the fastapi-jwt-auth or PyJWT library offers similar functionality. Define a Pydantic model for user data, generate tokens with an expiry time, and apply dependency injections to secure routes. FastAPI’s asynchronous design makes token verification efficient, even under high traffic.
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