In Angular applications, managing user sessions and handling session expiration involves using a combination of JWT tokens, HttpInterceptors, and route guards.
1. When a user logs in, the server returns a JWT token containing user information and an expiration time.
2. Store the JWT token in a secure client-side storage like sessionStorage or localStorage.
3. Create an HttpInterceptor to attach the stored JWT token as an Authorization header for every API request.
4. In the interceptor, check if the token is expired before sending the request. If it’s expired, redirect the user to the login page or refresh the token using a refresh token strategy.
5. Implement route guards to protect specific routes based on user roles or authentication status. Use canActivate() and canLoad() methods in the guard to verify the user’s access rights.
6. Subscribe to router events to detect navigation changes and validate the user’s session. If the session is invalid, force logout and redirect to the login page.
