JWT is everywhere. It has client libraries in every language, first-class support in most OAuth 2.0 frameworks, and enough documentation that most developers can get a token issuing and validating in an hour. That familiarity is genuinely useful. It is also why JWT’s design problems persist – the ecosystem has grown large enough that replacing it feels impractical, and so the known issues become something you learn to work around rather than eliminate. by Steve McDougall