question

There is no definition of the variable catalog that on line 3 in your function, so it would return JavascriptException error because of “catalog is not defined”. The type of CatalogVersion field in the Server API GetCatalogItems should be a string, so you need to define the catalog using a string, such as “MainCatalog”. Or as the API reference – CatalogVersion says, you can let this API use the default CatalogVersion if you don’t pass this field. You can refer to the following testing code.

var catalog = "Main";//Modify it to your catalogVersion
handlers.getCatalogItems = function (args, context) {
  var catalogItems = getCachedPlayfabCatalog();
  return catalogItems;
}

function getCachedPlayfabCatalog() {
  if (typeof getCachedPlayfabCatalog.catalogItems == 'undefined') {
    var getCatalogItemsResponse = server.GetCatalogItems({ CatalogVersion: catalog });
    getCachedPlayfabCatalog.catalogItems = getCatalogItemsResponse.Catalog;
  }
  return getCachedPlayfabCatalog.catalogItems;
};

Besides, we would suggest you use an external REST API testing tool Postman to test PlayFab API. It is a convenient way to check the error details of all APIs. You can use this tool to test the ExecuteCloudScript API to check the error of your CloudScript functions.