JWT (JSON Web Token) is a compact, self-contained, and verifiable token format that we frequently use for authentication in modern APIs and distributed systems. I've been using JWTs in many of my projects for a while now, and they especially provide great convenience in microservice architectures or when communicating with mobile application backends. However, the "stateless" nature, which is JWT's biggest advantage, also brings certain complexities regarding token refresh and especially revocation mechanisms. If not managed correctly, these complexities can lead to serious security vulnerabilities. When I first started implementing JWTs for the API used by operator screens in a production ERP system, everything seemed smooth at first. But situations like users being abruptly logged out when tokens expired, or our inability to instantly cut off a user's access in an emergency, showed me how critical these mechanisms are.…