getUsers = function (user, pass, urole){
      var data = '';
      Publisher.findOne({username:user, password:pass, role:urole},function(err, success){
         if (err){}
         if (!success){
           //when data not found
           data = 'null';
         }else{
           //when data found
           data = 'found';
         }
     });
     return data;
}

var user = getUsers(user,pass,urole)
console.log(user)