How do you manage state between frontend and backend?

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Managing state between the frontend and backend ensures both sides have a consistent view of user data across requests. Since HTTP is stateless, extra mechanisms are needed to persist and share state.

Common approaches:

1. Sessions – The backend stores user-specific data on the server, and a session ID is sent to the frontend via cookies.

2. Cookies – Small pieces of data stored in the browser, often used for authentication tokens or preferences.

3. JWT (JSON Web Tokens) – Encodes user data into a signed token stored on the client (usually in cookies or localStorage) and sent with each request.

4. Database-backed State – Persist data in a database so it can be retrieved on subsequent requests.

5. Local Storage / Session Storage – Store non-sensitive state in the browser for quick retrieval.

Best practices:

• Keep sensitive data server-side (sessions or secure tokens).

• Use HTTPS to protect data in transit.

• Implement expiration and refresh mechanisms for tokens.

In short, state management involves choosing secure and efficient methods like sessions, tokens, or persistent storage to ensure smooth communication between frontend and backend.

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