I second this when it comes to APIs. If you're exposing them to third parties it's especially useful, as you can draft how the endpoint should look and behave u

I second this when it comes to APIs. If you're exposing them to third parties it's especially useful, as you can draft how the endpoint should look and behave using something like Swagger, and then work from the top down. At my job we have close communication with third parties who use our api endpoints, so we are constantly sending drafts of JSON requests / URLs back and forth.