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

Features

• 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, Silverlight, Windows Phone and Windows 8.

The JSON serializer is a good choice when the JSON you are reading or writing maps closely to a .NET class.

LINQ to JSON is good for situations where you are only interested in
getting values from JSON, you don't have a class to serialize or
deserialize to, or the JSON is radically different from your class and
you need to manually read and write from your objects.

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