OpencgaClient is the Javascript client library for OpenCGA RESTful Web Services, all the web services are accessible through this client, and it offers a quick way to query OpenCGA projects through web interface. In the same way than in Using RESTful Web Services URL tutorial, we will focus on those end points more interesting for HGVA users. In order to make it easy to follow we will use the same examples used in Using RESTful Web Services URL.