Trying out some json converters

TOOHUCardAPI/Data/JsonConverters/RankEntryDTOConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using TOOHUCardAPI.DTO.RankData;
+
+namespace TOOHUCardAPI.Data.JsonConverters
+{
+    public class RankEntryDTOConverter : JsonConverter<RankEntryDTO>
+    {
+        public override void WriteJson(JsonWriter writer, RankEntryDTO value, JsonSerializer serializer)
+        {
+            List<RankCardDTO> cards = value.Cards;
+            value.Cards = null;
+            JObject jo = JObject.FromObject(value);
+            for (int i = 0; i < cards.Count; i++)
+            {
+                jo[$"card{i}"] = JObject.FromObject(cards[i]);
+
+            }
+            jo.WriteTo(writer);
+        }
+
+        public override RankEntryDTO ReadJson(JsonReader reader, Type objectType, RankEntryDTO existingValue, bool hasExistingValue,
+            JsonSerializer serializer)
+        {
+            JObject jo = JObject.Load(reader);
+            RankEntryDTO dto = new RankEntryDTO();
+            serializer.Populate(reader, dto);
+            dto.Cards = jo.Properties().Where(prop => prop.Name.Contains("card"))
+                .Select(i => i.Value.ToObject<RankCardDTO>()).ToList();
+            return dto;
+        }
+    }
+}