What is the library name needed to use JObject?

Question

It's in the Newtonsoft.Json.Linq namespace. You should just need the Newtonsoft.Json.DLL.

You are looking for JSON.NET written by James Newton-King

You can try this link http://www.newtonsoft.com/json and download it

OR You can you the Nuget command line in the visual studio that will install it for you. If you want to try it here is the command you have to run: https://www.nuget.org/packages/Newtonsoft.Json/7.0.1-beta3