Is JSON a Data Structure?

I'm drawing the line between what a data structure is, just formatted structures of data. It doesn't turn into a data structure until you materialize it or marshal it back into something that the programming language is using. I do think there are a couple gray areas like we've talked about inverted indexes before and how sometimes they'll actually store an index backwards in order to make certain kind of like clauses match. And also, there's example a couple years ago where Blizzard Entertainment used to store your passwords,. They would lowercase the whole thing just to kind of get around people's password typos.