diff --git a/LibMatrix/Extensions/JsonElementExtensions.cs b/LibMatrix/Extensions/JsonElementExtensions.cs
new file mode 100644
index 0000000..caf96e1
--- /dev/null
+++ b/LibMatrix/Extensions/JsonElementExtensions.cs
@@ -0,0 +1,150 @@
+using System.Reflection;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+using LibMatrix.Responses;
+
+namespace LibMatrix.Extensions;
+
+public static class JsonElementExtensions {
+ public static bool FindExtraJsonElementFields(this JsonElement obj, Type objectType, string objectPropertyName) {
+ if (objectPropertyName == "content" && objectType == typeof(JsonObject))
+ objectType = typeof(StateEventResponse);
+ // if (t == typeof(JsonNode))
+ // return false;
+
+ Console.WriteLine($"{objectType.Name} {objectPropertyName}");
+ bool unknownPropertyFound = false;
+ var mappedPropsDict = objectType.GetProperties()
+ .Where(x => x.GetCustomAttribute<JsonPropertyNameAttribute>() is not null)
+ .ToDictionary(x => x.GetCustomAttribute<JsonPropertyNameAttribute>()!.Name, x => x);
+ objectType.GetProperties().Where(x => !mappedPropsDict.ContainsKey(x.Name))
+ .ToList().ForEach(x => mappedPropsDict.TryAdd(x.Name, x));
+
+ foreach (var field in obj.EnumerateObject()) {
+ if (mappedPropsDict.TryGetValue(field.Name, out var mappedProperty)) {
+ //dictionary
+ if (mappedProperty.PropertyType.IsGenericType &&
+ mappedProperty.PropertyType.GetGenericTypeDefinition() == typeof(Dictionary<,>)) {
+ unknownPropertyFound |= _checkDictionary(field, objectType, mappedProperty.PropertyType);
+ continue;
+ }
+
+ if (mappedProperty.PropertyType.IsGenericType &&
+ mappedProperty.PropertyType.GetGenericTypeDefinition() == typeof(List<>)) {
+ unknownPropertyFound |= _checkList(field, objectType, mappedProperty.PropertyType);
+ continue;
+ }
+
+ if (field.Name == "content" && (objectType == typeof(StateEventResponse) || objectType == typeof(StateEvent))) {
+ unknownPropertyFound |= field.FindExtraJsonPropertyFieldsByValueKind(
+ StateEvent.GetStateEventType(obj.GetProperty("type").GetString()),
+ mappedProperty.PropertyType);
+ continue;
+ }
+
+ unknownPropertyFound |=
+ field.FindExtraJsonPropertyFieldsByValueKind(objectType, mappedProperty.PropertyType);
+ continue;
+ }
+
+ Console.WriteLine($"[!!] Unknown property {field.Name} in {objectType.Name}!");
+ unknownPropertyFound = true;
+ }
+
+ return unknownPropertyFound;
+ }
+
+ private static bool FindExtraJsonPropertyFieldsByValueKind(this JsonProperty field, Type containerType,
+ Type propertyType) {
+ if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable<>)) {
+ propertyType = propertyType.GetGenericArguments()[0];
+ }
+
+ bool switchResult = false;
+ switch (field.Value.ValueKind) {
+ case JsonValueKind.Array:
+ switchResult = field.Value.EnumerateArray().Aggregate(switchResult,
+ (current, element) => current | element.FindExtraJsonElementFields(propertyType, field.Name));
+ break;
+ case JsonValueKind.Object:
+ switchResult |= field.Value.FindExtraJsonElementFields(propertyType, field.Name);
+ break;
+ case JsonValueKind.True:
+ case JsonValueKind.False:
+ return _checkBool(field, containerType, propertyType);
+ case JsonValueKind.String:
+ return _checkString(field, containerType, propertyType);
+ case JsonValueKind.Number:
+ return _checkNumber(field, containerType, propertyType);
+ case JsonValueKind.Undefined:
+ case JsonValueKind.Null:
+ break;
+ default:
+ throw new ArgumentOutOfRangeException();
+ }
+
+ return switchResult;
+ }
+
+ private static bool _checkBool(this JsonProperty field, Type containerType, Type propertyType) {
+ if (propertyType == typeof(bool)) return true;
+ Console.WriteLine(
+ $"[!!] Encountered bool for {field.Name} in {containerType.Name}, the class defines {propertyType.Name}!");
+ return false;
+ }
+
+ private static bool _checkString(this JsonProperty field, Type containerType, Type propertyType) {
+ if (propertyType == typeof(string)) return true;
+ // ReSharper disable once BuiltInTypeReferenceStyle
+ if (propertyType == typeof(String)) return true;
+ Console.WriteLine(
+ $"[!!] Encountered string for {field.Name} in {containerType.Name}, the class defines {propertyType.Name}!");
+ return false;
+ }
+
+ private static bool _checkNumber(this JsonProperty field, Type containerType, Type propertyType) {
+ if (propertyType == typeof(int) ||
+ propertyType == typeof(double) ||
+ propertyType == typeof(float) ||
+ propertyType == typeof(decimal) ||
+ propertyType == typeof(long) ||
+ propertyType == typeof(short) ||
+ propertyType == typeof(uint) ||
+ propertyType == typeof(ulong) ||
+ propertyType == typeof(ushort) ||
+ propertyType == typeof(byte) ||
+ propertyType == typeof(sbyte))
+ return true;
+ Console.WriteLine(
+ $"[!!] Encountered number for {field.Name} in {containerType.Name}, the class defines {propertyType.Name}!");
+ return false;
+ }
+
+ private static bool _checkDictionary(this JsonProperty field, Type containerType, Type propertyType) {
+ var keyType = propertyType.GetGenericArguments()[0];
+ var valueType = propertyType.GetGenericArguments()[1];
+ valueType = Nullable.GetUnderlyingType(valueType) ?? valueType;
+ Console.WriteLine(
+ $"Encountered dictionary {field.Name} with key type {keyType.Name} and value type {valueType.Name}!");
+
+ return field.Value.EnumerateObject()
+ .Where(key => !valueType.IsPrimitive && valueType != typeof(string))
+ .Aggregate(false, (current, key) =>
+ current | key.FindExtraJsonPropertyFieldsByValueKind(containerType, valueType)
+ );
+ }
+
+ private static bool _checkList(this JsonProperty field, Type containerType, Type propertyType) {
+ var valueType = propertyType.GetGenericArguments()[0];
+ valueType = Nullable.GetUnderlyingType(valueType) ?? valueType;
+ Console.WriteLine(
+ $"Encountered list {field.Name} with value type {valueType.Name}!");
+
+ return field.Value.EnumerateArray()
+ .Where(key => !valueType.IsPrimitive && valueType != typeof(string))
+ .Aggregate(false, (current, key) =>
+ current | key.FindExtraJsonElementFields(valueType, field.Name)
+ );
+ }
+}
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