If you ask IT-fans and professionals what types of API they know, 90% of them will say: «REST». There is no wonder, because almost all the known services already have the REST API. Therefore, as QA-crowd we should carefully test the API, find bugs, and leave users satisfied. My report covers the problem of REST testing. In this report, I will develop the theme of different instruments for functional testing: from SoapUI, to console, depending on the object of testing. I will show you the ways of REST API testing automation. I will tell you about the tools for error reporting, REST stress testing and creation of REST documentation. You will discover the life hacks, which I use for the REST API testing.