JSON Web Tokens (JWT) A JSON Web Token (JWT) is commonly used for authentication and authorization in web applications and APIs. Essentially, JWTs encode info about a user or entity into a JSON object, which is then digitally signed and/or encrypted. A JWT consists of three parts, separated by dots (.): 1. Header: Contains metadata about the token, such as the signing algorithm (e.g., HMAC SHA256, RSA SHA256) and the token type (JWT). 2. Payload: Contains the claims, which are statements about an entity (e.g., user ID, role, expiration time). 3. Signature: Verify that the JWT sender is who they claim to be and that the message hasn't been tampered with. How it works: Authentication: A user logs in, and the server creates a JWT containing user info and other relevant claims. Token Transmission: The server sends the JWT to the client (e.g., browser). Subsequent Requests: The client includes the JWT in the au...
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