What mechanisms can be used for secure management of user sessions with JWT, including the ability for users to terminate their active sessions?

JWT (JSON Web Token) is often used for authentication and session management, but since JWT itself is static and not stored on the server, additional mechanisms are needed for security and session termination:

1. Storing a list of revoked tokens (blacklist) — the server stores identifiers (e.g., jti) or the tokens themselves that have been revoked by the user. Each request checks whether the token is in the blacklist.

2. Using short-lived tokens (expiration) — JWTs are made with a short lifespan (e.g., 15 minutes), and refresh tokens, which are stored on the server and can be revoked, are used for renewal.

3. Storing refresh tokens on the server — refresh tokens allow issuing new JWTs. The user can end the session by deleting the refresh token on the server, preventing new JWTs from being issued.

4. Session identifiers in JWT — a unique session identifier can be included in the token. The server stores active sessions, and upon session termination, deletes the corresponding identifier, making the JWT invalid.

Example: a user logs in, the server creates a JWT with jti and a refresh token, and stores the refresh token in the database. Upon logout, the server deletes the refresh token and adds jti to the blacklist. Each request checks that jti is not in the blacklist.

Thus, by combining short-lived JWTs, refresh tokens, and session state storage on the server, security and session termination by the user can be ensured.