At work, I needed to create a mock service for conducting tests for our services, but I did not find a service in the public domain that would satisfy my needs. These are: creating a mock endpoint, assigning it various response templates (with the ability to assign several at once so that they are randomly selected), and most importantly – relay. So that it would be possible to simulate the work of DLR.

So a small Next.JS project with authorization, endpoint management, response templates, and relays appeared.