Vue Router and Axios Interceptors: Synchronizing Session Expiration State

Session State Synchronization

In a Vue.js application utilizing Pinia for state management and Axios for API communication, there is a functional boundary between the HTTP interceptor that detects expired credentials and the Vue Router guards that protect client-side routes.

When an Axios interceptor catches a 401 Unauthorized response, it must trigger a state change to invalidate the session. However, if the user is navigating through protected routes via the Vue Router, the local state may remain 'authenticated' until the next navigation guard execution or a full page refresh, potentially leading to a UI state that contradicts the server-side session status.

Given the need to maintain a least-privilege UI, the application must ensure that the transition from an authenticated to an unauthenticated state is atomic across both the network layer and the routing layer.

• How can the application ensure that a 401 response in an Axios interceptor immediately triggers a route redirection without relying on a subsequent navigation event?
• What is the most reliable method to synchronize the Pinia authentication state with the Vue Router's current route guard to prevent brief flashes of protected content after credential expiration?