[c-smile]

> that most of hte libraries taking a JSON document approach are wasting a lot of time/memory

I agree. That's the same situation as with XML/HTML. In many cases you don't really need to build a DOM or JSOM in memory. If your task is about deserializing some native structures.

This XML scanner of mine does not allocate any memory at all while parsing HTML/XML: https://www.codeproject.com/Articles/14076/Fast-and-Compact-...

It is even simpler than SAX parser.

[beached_whale]

For the interesting JSON of a significant size, an interator/range interface that parses to concrete types works really well. Usually they are large arrays or JSONL like things