That's just parsing JSON and interpreting the data. Since parsing JSON and producing arbitrary object models is a solved problem, parsing an x-like format that uses JSON is also a solved problem for all x (developing the object model to use for it is an issue, perhaps, but you have to have that before you can have any serialization format, so that's not a distinguishing problem between different approaches.)

Note that I am not, here, endorsing JSON over other alternatives; the same is obviously true of XML, HTML, YAML, or lots of other potential formats.