Decoupled Blocks with Drupal, Backdrop, and React

Over the last few months I decided to start building some of the decoupled blocks that I've been hearing about at Drupal events.  After getting the Drupal version working I wondered about how I would put the same block into a Backdrop site.  So I changed the module to be a Backdrop module instead of a Drupal module.

After that project I had a Backdrop site that had information I wanted to share inside a Drupal site.  I reversed the process, making a decoupled Backdrop block first and then changing the module to be a Drupal module.

We can talk about how I did this with jsonapi, and the Headless module in Backdrop and why.