# JSON Web Token

JSON Web Tokens (JWT) are a JWS with a set of reserved claims to be used in a standardized manner.

## JWT Reserved Claims

Claim | Name | Format | Usage
--- | --- | --- | ---
‘exp’ | Expiration | int | The time after which the token is invalid.
‘nbf’ | Not Before | int | The time before which the token is invalid.
‘iss’ | Issuer | str | The principal that issued the JWT.
‘aud’ | Audience | str or list(str) | The recipient that the JWT is intended for.
‘iat’ | Issued At | int | The time at which the JWT was issued.