Yeah, but that structure is also easy to explore and understand. And in case you want some security you can use libraries like prismatic/schema, that allow you

Yeah, but that structure is also easy to explore and understand. And in case you want some security you can use libraries like prismatic/schema, that allow you to declaratively describe your expected data-structures akin to a type system. The web is build on json and not corba because plain maps and vectors are far easier to work with than domain specific objects.