How json web token works?

JSON Web Token (JWT) is a secure method for transmitting information between parties as a JSON object. A JWT consists of three parts: header, payload, and signature, separated by dots. The header specifies the token type and signing algorithm. The payload contains claims or user data encoded in base64. The signature is created by combining the encoded header, payload, and a secret key using the specified algorithm, ensuring the token has not been tampered with. When a user logs in, the server generates a JWT and sends it to the client. The client includes this token in subsequent requests, typically in the Authorization header. The server validates the signature to authenticate requests without storing session data, enabling stateless authentication perfect for distributed systems and APIs.