JWT

Definition: JWT = JSON Web Token, a compact token containing claims that can be digitally signed so a server can verify who/what the token represents.
It is commonly used for authentication and authorization between clients and APIs.

Examples:

1. User logs in → server returns JWT → browser sends it with API requests.
2. JWT contains userId=123 and role=admin.
3. Mobile app sends a JWT to access /api/orders.

Typical structure:

header.payload.signature

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Back-End JWT