How to get logged in user userrole in kentico9 through api??

Hello,

AuthenticationHelper.IsAuthenticated() method idicates that current user is logged in.

MembershipContext.AuthenticatedUser holds the current user

example:

if (CMS.Membership.AuthenticationHelper.IsAuthenticated())
    {
        if (CMS.Membership.MembershipContext.AuthenticatedUser.IsInRole("yourRoleName","siteName"))
        {
            //do something
        }
    }