As a frontend or mobile developer you may want to showcase a prototype or a demo of your application, but unfortunately you will need a server to host your api data but also you have to set up your backend api with your custom data which is more additional pain.
Or maybe you start your project from the front side but in order to test it you need a quick api ready with some mocked data.
That why I want to introduce my little idea that I made recently to help me build my apps without having any backend ready:
https://fetchjson.com
You can build your own api urls with your custom scema and it will generate for you data to test or showcase your frontend or mobile app.