Addin to Visual Studio for visualizing a selected json string in the editor

I've got a lot of xml files, and embedded in some elements there are json serialized objects. They are quite difficult to read and modify. So question is:

Are there any Visual Studio addins availible that can take selected json-text in the editor, and visualize it (and maybe even allow for editing)?

if not, if I must build it - are there any good starting points or samples availible? (making a right-click command availible when text is selected, and t开发者_如何学Pythonhem showing a popup)

Regards

Larsi

http://jsonviewer.codeplex.com