Creating an application which provides REST API is nowadays a very easy task. There are countless of languages with frameworks that make this task very easy. Always when you decide to add new resources or update some resources in your API you probably just open the implementation of the application, make changes to the source code, write some tests and then you put your application to production.
Specification-first API design
Specification-first API design
Specification-first API design
Creating an application which provides REST API is nowadays a very easy task. There are countless of languages with frameworks that make this task very easy. Always when you decide to add new resources or update some resources in your API you probably just open the implementation of the application, make changes to the source code, write some tests and then you put your application to production.