One of its use cases, and the reason why this library has been created, is that it provides an elegant solution to request data from APIs. In API world, especially REST API world, JSON format is one of the most common, lightweight and human friendly format available, and it will probably stay around for another decade. Because of that, I believe that supporting Commodore 64 and other 8-bit machines with the versatile 6502 JSON Parser will bring new ideas, and actively help to develop modern software for our beloved, small, but still in some way powerful machines.
You could easily use this JSON parser with http64 library written by Doc Bacardi which allows to make requests over HTTP. You can find source code here: http://csdb.dk/release/?id=14611. http64 library is used in HTTP-Load, and Singular Browser, and works perfectly with RR-Net ethernet cartridge, or other devices.