Hopefully you're free from Webforms and ViewStates by now.. But sometimes bad things happen to good people, and you need to find out why the viewstate of a decade old site is 5mb large. Inspecting the viewstate is all manners of not fun, so this little class could help!
To use the class, you'll need to overload the 'SavePageStateToPersistenceMedium' of a WebForms page, inside that you can call the Save-function of ViewStateToJsonExporter, and you'll get a nice big json dump!