diff --git a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
new file mode 100644
index 00000000..674e4926
--- /dev/null
+++ b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace GraphQL.Client.Serializer.SystemTextJson
+{
+    public abstract class PolymorphicTypenameConverter<T> : JsonConverter<T>
+    {
+        protected abstract Type GetTypeFromTypenameField(string typename);
+
+        public override bool CanConvert(Type typeToConvert) =>
+            typeof(T).IsAssignableFrom(typeToConvert);
+
+        public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var clone = reader; // cause its a struct
+
+            if (clone.TokenType == JsonTokenType.StartObject)
+                clone.Read();
+            if (clone.TokenType != JsonTokenType.PropertyName || clone.GetString() != "__typename")
+
+                throw new JsonException();
+
+            clone.Read();
+            var type = Descriminator(clone.GetString());
+            object deserialize = JsonSerializer.Deserialize(ref reader, type, options);
+            return (T)deserialize;
+        }
+
+        public override void Write(Utf8JsonWriter writer, T obj, JsonSerializerOptions options) =>
+            throw new NotSupportedException();
+    }
+}