Retrieve list of entities in CRM 2015 using JS

Hello,

I want to retrieve list of entities and their fields in CRM 2015 using JavaScript. I tried using ClientGlobalContext.js but according to this msdn link https://msdn.microsoft.com/en-us/library/gg334511.aspx there is no function to retrieve list of entities using ClientGlobalContext.js. Can anyone tell me how can this be achieved. Thanks in advance.