I'm still not sure what your question is. I pointed to google because it sounds like you need an example in C++ for JSON parsing, which sounds like a very generic question, and is unrelated to TTN in particular.
But maybe I'm wrong: what is the problem exactly? What do you mean by 'accumulated in my Node'? Are we talking about your node or your client (internet-side) implementation? If you are talking about the node it helps to see the node implementation. If you're talking about the client-side and somehow the amount of data from the API is a problem, consider using the limit parameter (http://thethingsnetwork.org/api/v0/nodes/05060709/?limit=1).