Tried it on a 9.9MB json file I have. Seemed to handle the size fine, but the output was nothing like what I would want. I made a smaller version of what I uploaded in the below pastebin and the output.

The data is TLD data so it should have at least given me the "com", "net", "..." part

Input

https://pastebin.com/QAWeu8Xt

Output

    category,addedToListPrice,appliesToCustomers,amountRateType,amountRate,type
    fee_tax,false,eu,percent-varies-by-location,~,vat
    fee_tax,false,in,percent,15,gst
    fee_tax,false,au,percent,10,gst
    fee_tax,false,eu,percent-varies-by-location,~,vat

An explanation of _how_ it does the conversion would be nice when choosing a tool like this. As the "just works" didn't seem to work.