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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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It's not clear whether all filenames will be in
"pickme-YYYYMMDD.fun"
format.The function name should be in camelCase.
No random tests.
Almost a duplicate of an older kata: https://www.codewars.com/kata/5286d92ec6b5a9045c000087
JSON specifically means the stringified notation. Just get rid of "JSON" from the description; it's confusing and I initially thought you wanted me to return the JSON string. What the function returns isn't JSON; it's an array containing a nested structure of objects and arrays.
I'd even go so far as to recommend changing the name of the function to leave out Json completely. Yes, it'll break everyone's solutions, but the Kata is still in beta and that's what it's for.