Serialize/Deserialize dynamic property name using JSON.NET

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You could create a custom JsonConverter to handle the dynamic property name:

public class MyRequestConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(MyRequest);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jo = JObject.Load(reader);
        string type = (string)jo["type"];
        MyRequest req = new MyRequest
        {
            Type = type,
            Source = (string)jo[type ?? ""]
        };
        return req;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        MyRequest req = (MyRequest)value;
        JObject jo = new JObject(
            new JProperty("type", req.Type),
            new JProperty(req.Type, req.Source));
        jo.WriteTo(writer);
    }
}

To use the converter, add a [JsonConverter] attribute to your class like this:

[JsonConverter(typeof(MyRequestConverter))]
public class MyRequest
{
    public string Type { get; set; }
    public string Source { get; set; }
}

Here is a working round-trip demo: https://dotnetfiddle.net/o7NDTV

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