Json stream parser in C# for windows phone

You can use JSON.NET library, you can get it here: http://json.codeplex.com/

I state from codeplex these features of JSON.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, Silverlight, Windows Phone and Windows 8.

and here is a little example:

public class MyClass
  {
    public string MyProperty;
    public string[] MyArray;        
  }
string json = JsonConvert.SerializeObject(new MyClass() { MyProperty = "Test",  MyArray = new string[] { "Test1", "Test2" } });
    //{"MyProperty":"Test","MyArray":["Test1","Test2"]}"

EDIT

Here is a little example:

      System.Net.WebClient client = new System.Net.WebClient();
      using (var stream = client.OpenRead(url))
      {      
        byte a = 0;
        var list = new List<byte>();
        do{
          a = (byte)stream.ReadByte();
          list.Add(a);
          if(/*Test if valid JSON string*/)
          {
            var str = System.Text.Encoding.UTF8.GetString(list.ToArray());
            JsonConvert.DeserializeObject<MyClass>(str);
          }
        }while(a != -1)
      }

you can use TcpClient to connect. Check this question Subscribing over TCP, deserializing each recieved JSON line