Hello. From migration jwt 2 to 3, we cannot indexing Claims anymore. check it in [](https://github.com/dgrijalva/jwt-go/issues/143) and [](https://github.com/dgrijalva/jwt-go/blob/master/MIGRATION_GUIDE.md) From jwt 3 version, we can use ``` // old version of jwt // token.Claims["a"] := someWhat // new version of jwt token.Claims = jwt.MapClaims{ "a": someWhat, } ``` If you'd like to, I will migrate jwt 2 to 3 with improve methods. Thanks.