Json.NET

http://www.newtonsoft.com/json
https://github.com/JamesNK/Newtonsoft.Json


Description:

Json.NET is a popular high-performance JSON framework for .NET

-Flexible JSON serializer for converting between .NET objects and JSON
-LINQ to JSON for manually reading and writing JSON
-High performance, faster than .NET's built-in JSON serializers
-Write indented, easy to read JSON
-Convert JSON to and from XML
-Supports .NET 2, .NET 3.5, .NET 4, .NET 4.5, Silverlight, Windows Phone, Windows 8 Store and .NET Core


Documentation:

http://www.newtonsoft.com/json/help/


Versions:

Json.NET has different libraries for the various .NET Framework versions.

-net45:
  .NET 4.5+

-net40:
  .NET 4.0

-net35:
  .NET 3.5

-net20:
  .NET 2.0, Unity

-portable-net45+win8+wpa81+wp8:
  .NET 4.5, Windows Phone 8, Windows 8 Store

-portable-net40+win8+wpa81+wp8+sl5:
  .NET 4.0, Windows Phone 8, Windows 8 Store, Silverlight 5, MonoTouch, MonoDroid

-netstandard1.0:
  .NET Standard 1.0

-netstandard1.3:
  .NET Standard 1.3

-netstandard2.0:
  .NET Standard 2.0


Notes:

For a Compact Framework 3.5 and Silverlight 3.0 builds download Json.NET 3.5
For a Silverlight 4.0 and Windows Phone 7 builds download Json.NET 5