I’ve been using Optic’s CLI, an OpenAPI tool that does a bunch of things including diffing OpenAPI descriptions and comparing HTTP traffic with OpenAPI. My use case was an established API that didn’t have an OpenAPI file yet – using Optic we could create one as a starting point, and then move to a design-first workflow to make the changes that I was there to help with. For this blog post, I’ve used the example of https://api.joind.in as an excellent representation of an API still in use, but without an OpenAPI file and not built with code that a code generator would recognise. Continue reading →