I wrote a more traditional JSON parser for my microcontooller project. You could iterate over elements and it would return "needs more data" if it was unable to proceed. You could then call it again after fetching more. Then just simple state machines to consume the objects.

The benefit with that was that you didn't need the memory to store the deserialized JSON object in memory.

This seems to be more oriented towards interactivity, which is an interesting use-case I hadn't thought about.