Each wife had seven sacks…

Converting simple, flat JSON data into CSV or another tabular format is a problem addressed by many freely-available JSON-to-CSV converters. However, these are usually only useful when the JSON is a series of flat objects without any nested arrays.

In practice, real-world JSON files often have nested arrays containing more objects, each of which may contain arrays of their own. They tend to look like the old riddle As I was going to St Ives:

As I was going to St. Ives,
I met a man with seven wives.
Each wife had seven sacks,
Each sack had seven cats,
Each cat had seven kits.
Kits, cats, sacks, wives,
How many were there going to St. Ives?