Seonglae ChoClaim Set
The JWT Claim Set is the actual body of the token that contains the information to be included. Since JWT refers to token information as claims, the body section holding all this information is called the Claim Set. The Claim Set consists of multiple pairs of Claim Names (keys) and Claim Values (values).
You can include information like user IDs here and use them directly without needing to query the database.
Registered claim names are those registered in IANA JSON Web Token Claims. While not mandatory, they are standard values defined for common use. The following list shows registered claim names, all of which are optional:
iss: The issuer who issued the token
sub: The subject of the claim, representing the context of the token
aud: The audience that will use this token
exp: Expiration time - tokens past this time should be rejected
nbf: Not Before, meaning the token should not be processed before this time
iat: Issued At, the time when the token was issued
jti: JWT ID, an identifier for the token
Public claim names are defined for use in tokens but are publicly registered to prevent collisions, while private claim names refer to names agreed upon between the server and client.