How do I get a Username for a player not in game from an ID?

http://api.roblox.com/Users/2966752

Above is the API I have found. Is there any way to see the output in a game and then detect which part is the Username?

This is the output of the link: {"Id":2966752,"Username":"Validark"}

So it is always after ["Username":]. Is there any sort of Sub method I can use to use this in a script in-game?