// To convert an XML node contained in string xml into a JSON string
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
string jsonText = JsonConvert.SerializeXmlNode(doc); // To convert JSON text contained in string json into an XML node
XmlDocument doc = (XmlDocument)JsonConvert.DeserializeXmlNode(json);
XmlNote myXmlNode = JsonConvert.DeserializeXmlNode(myJsonString);
// or .DeserilizeXmlNode(myJsonString, "root");
// if myJsonString does not have a root
string jsonString = JsonConvert.SerializeXmlNode(myXmlNode);
XmlDictionaryReader reader = JsonReaderWriterFactory.CreateJsonReader(Encoding.UTF8.GetBytes(xml), XmlDictionaryReaderQuotas.Max);
XmlDocument xdoc = new XmlDocument();
xdoc.Load(reader);