Testing REST services with javascript

Why should I start from tests? Pretty simple, by implementing tests before you are looking on your service as client<, not as a developer. When I was working to version 1 of my REST API I didn't do any tests, basically because I didn't know how to do them. When I was ready and started implementation of the client code and documentation, I found out major API issues that I had no time to solve. Those issues were related to: design, security, formats and convenience of usage. TDD principles works the same here: clear and simple design through series of tests.