.listdupes - macmcmeans/localDataStorage GitHub Wiki
localDataStorage.listdupes()
This method returns a detailed JSON object delineating the tally of duplicate values as well as a naturally sorted array showing the keys having them. Data types are respected. This method has no arguments.
EXAMPLE:
● localData.listdupes() --> { dupecount: 2, dupes: {…} }

To get the count of duplicate values in the store, use countdupes. When you need to see them, use showdupes.