puffnfresh/haskell-jwt

This project is a Haskell library for encoding and decoding JSON Web Tokens, commonly known as JWTs. If you are building a web application where users log in, JWTs are a standard way to represent those login sessions. Instead of checking a database every time a user clicks something, your app can simply read a small, signed token to confirm the user is who they say they are. At a high level, a JWT is a compact, URL-safe string that carries "claims", essentially pieces of information like a user's ID or their role. Because these tokens are digitally signed, the server can trust the information inside them, if anyone tampers with the token mid-transfer, the signature will break and the server will reject it. This library gives Haskell developers the tools to create new signed tokens when a user logs in, and to decode and verify incoming tokens on subsequent requests. This would be used by backend developers building authentication systems in Haskell. For example, if a user logs in, your server creates a JWT saying "this is user 123." When that same user tries to access their account page a minute later, the server uses this library to decode the token, verify its signature, and grant access, all without hitting the database again. The README itself is quite sparse and doesn't go into detail about advanced usage or setup. However, it points to official documentation that likely covers the specifics of implementation for developers ready to dive in.