What is claim in JSON web token?

How is a JWT token generated? We set the signing algorithm to be HMAC SHA256 (JWT supports multiple algorithms), then we create a buffer from this JSON-encoded object, and we encode it using base64 . The partial result is eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9 .

JWT contains three parts: Header, Payload, and Signature which are separated by a dot. The JWT Header consists of 2 parts: The token type (typ): JWT. Algorithm used to sign the token (alg)

JWT, or JSON Web Token, is an open standard used to share security information between two parties — a client and a server . Each JWT contains encoded JSON objects, including a set of claims. JWTs are signed using a cryptographic algorithm to ensure that the claims cannot be altered after the token is issued.