Different response formats for APIs

[1andDone]

I've successfully set up/been using both the FindingAPI and ShoppingAPI. However, for me, the two APIs return responses in two different formats; the FindingAPI returns a response in JSON format while the ShoppingAPI returns a response in XML format. I have tried tinkering with some of the ShoppingAPI parameters but I cannot seem to get the API to return in a format other than XML. How can I get the ShoppingAPI to return a response in JSON format?