How do you manage state on the frontend when working with a Java backend?
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Managing frontend state when working with a Java backend involves handling UI state, authentication state, and data state, while ensuring smooth communication via APIs.
1. Frontend State Management
Use frontend frameworks like React, Vue, or Angular. Depending on the complexity, you can manage state using:
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React Context API or Redux for global state.
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Vuex for Vue.
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RxJS or services in Angular.
2. Authentication & Sessions
If your Java backend uses JWT (JSON Web Tokens):
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Store the JWT in memory or HTTP-only cookies (for security).
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On login, receive the token, store it securely, and attach it to requests using headers.
If using Spring Security with session-based auth:
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The backend manages sessions.
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The browser stores the session cookie and sends it automatically with requests.
3. Fetching and Syncing Data
Use fetch() or libraries like Axios to call Java backend APIs (often RESTful or via Spring Boot).
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Store responses in local state or global stores.
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Re-fetch or invalidate cache as needed (using tools like React Query or SWR).
4. Syncing with Backend
Ensure the backend has proper CORS and session configurations. Use tools like OpenAPI/Swagger to align frontend with backend APIs.
In summary: manage frontend state using appropriate libraries, handle authentication securely, and ensure smooth, secure communication with the Java backend.
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