Note Alternative here for the less technically inclined: https://codepen.io/benjuang/full/mKbGaV. It does not download files with nicer filenames, but you'll have a copy of all of your images.
This converts each json object from something like:
{
"title": "Seafood Mos Burger",
"caption": "Wheee rice bun. Why don't they have this in the US?",
"restaurantName": "Mos Burger",