I'm wondering if accessing sub element is a feature that you could implement ?

{ "foo1": "bar", "foo2": "bar2", "foo3": { "sfoo1" : 1, "sfoo2" : "42" } }

The idea is to get a direct access to a sub-element like this:

boost::json::object data; //parse data auto &magicNumber = data["foo3.sfoo2"];

The path separator would be configurable ("." or "/",...)

This is RFC6901, as it's done by rapidjson for example