JSON Web Token (JWT, pronounced "jot") is an emerging type of token-based authentication used in space-constrained environments such as HTTP Authorization headers.

JSON Web Token (JWT, pronounced "jot") is an emerging type of token-based authentication used in space-constrained environments such as HTTP Authorization headers. It is defined in RFC 7519. JWT is architected as a method for transferring security "claims based" between parties. Notable services using JWT are OpenID, thinktecture IdentityModel, and Google Payment API.