Parsing and using JSON is one of the fundamental components of the Modern Web. Now your Atari can do it with the help of FujiNet and the N: (network) device! Of course there is a excellent video which will break this down for you in a few moments:

The N: is new, and as such it’s documented over at the FujiNet wiki and it worth a read:

https://github.com/FujiNetWIFI/fujinet-platformio/wiki/Using-the-N%3A-Device

The N: device gives you access to a whole slate of modern web protocols in Atari Basic!

Disk swapping using FujiNet is done via the Disk Swap Button. This is a critical and necessary function that almost all ‘virtual disk’ emulators have- since you can virtually mount many disks on these devices, but you still may have only one virtual floppy drive. The swapping function rotates this virtual disks from their virtual slots round-robin into the virtual floppy. But how to let the user know what disk slot is mounted in the virtual floppy drive? FujiNet has no display to show you this information… The Software Automatic Mouth (SAM) can help here, and there is a video to show this in action.

There is also lots more documentation on how to use SAM yourself from BASIC on the FN Wiki:

https://github.com/FujiNetWIFI/fujinet-platformio/wiki/Using-SAM-%28Voice-Synthesizer%29