My JSON:API Server framework was born from a need for a slightly opinionated server to serve an API that subscribed strongly to the JSON:API spec. I choose to write my own after trying a number of other frameworks, but found none that gave me exactly what I was looking for. They were either too opinionated or not opinionated enough.
I began this work for a freelance project required a major rebuild of their API in order to more smoothly handle related resources. JSON:API provides a very clear way to return related resources for a RESTful API.
At the moment, work has stalled on this framework. The client wanted to go a different direction with my work. I plan to return to this framework in the future to be used in other projects. Currently, the framework can handle serving simple resources with no relations.