Caching can improve performance, but it has risks. Stale data, overuse of memory, and complex cache invalidation can cause issues. Developers must handle sensitive data securely and balance cache size and eviction strategies to avoid problems.
JWT (JSON Web Token) is popular because it provides a compact, secure, and self-contained way to transmit information between parties as a JSON object. It's widely used for authentication and authorization in web applications due to its simplicity and scalability. JWTs can be easily signed to ensure data integrity and can be verified without querying the database, making them efficient for stateless, decentralized systems like microservices and APIs. This makes JWT ideal for secure, lightweight, and scalable identity management.