JSON Web Tokens (JWTs) are widely used for authentication and authorization due to their efficiency, scalability, and simplicity, but they remain valid after logout because they are stateless by design, lacking server-side storage to automatically invalidate tokens. This characteristic can seem like a security flaw, but it is a deliberate trade-off for scalability, as it allows systems to handle large numbers of users without maintaining session states. Security risks are mitigated by practices such as setting short expiration times, using refresh tokens, and implementing backend checks for sensitive operations. While statelessness is suitable for applications with lower security risks, stateful token invalidation may be necessary for high-risk applications, involving server-side blacklists to ensure tokens are invalidated after logout. Tools like Descope can help manage JWT security by offering features like refresh token rotation and context-aware validation, balancing the need for both security and scalability.