diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5990ec7..8a4f50b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 - `JsonDecoder`:
   - `decode`: optimize resolution for `T`/`type` `dynamic`/`Object` (any type).
 
+- `JsonConverter` (`JsonEncoder` & `JsonDecoder`):
+  - Added `isStandard`.
+
 ## 2.4.1
 
 - `JsonEntityCache`:
diff --git a/lib/src/reflection_factory_json.dart b/lib/src/reflection_factory_json.dart
index ee5f342..35d7353 100644
--- a/lib/src/reflection_factory_json.dart
+++ b/lib/src/reflection_factory_json.dart
@@ -364,6 +364,9 @@ class JsonCodec {
 
 /// JSON decoder integrated with [ReflectionFactory].
 abstract class JsonConverter<S, T> implements dart_convert.Converter<S, T> {
+  /// Returns `true` if this instance's configuration is equivalent to the default configuration.
+  bool get isStandard;
+
   static bool isPrimitiveType(Type type) {
     return type == String ||
         type == int ||
@@ -588,6 +591,19 @@ class _JsonEncoder extends dart_convert.Converter<Object?, String>
     this.autoResetEntityCache,
   ) : entityCache = entityCache ?? JsonEntityCacheSimple();
 
+  @override
+  bool get isStandard =>
+      identical(this, _JsonEncoder._defaultEncoder) ||
+      (maskField == null &&
+          removeField == null &&
+          !removeNullFields &&
+          toEncodableProvider == null &&
+          toEncodable == null &&
+          !forceDuplicatedEntitiesAsID &&
+          autoResetEntityCache &&
+          maskText == '***' &&
+          entityCache is JsonEntityCacheSimple);
+
   @override
   void resetEntityCache() {
     entityCache.clearCachedEntities();
@@ -915,7 +931,8 @@ abstract class JsonDecoder extends JsonConverter<String, Object?> {
       JsonEntityCache? entityCache,
       bool forceDuplicatedEntitiesAsID = false,
       bool autoResetEntityCache = true}) {
-    if (jsomMapDecoderProvider == null &&
+    if (jsonValueDecoderProvider == null &&
+        jsomMapDecoderProvider == null &&
         jsomMapDecoder == null &&
         jsomMapDecoderAsyncProvider == null &&
         jsomMapDecoderAsync == null &&
@@ -1095,6 +1112,20 @@ class _JsonDecoder extends dart_convert.Converter<String, Object?>
     this.autoResetEntityCache,
   ) : entityCache = entityCache ?? JsonEntityCacheSimple();
 
+  @override
+  bool get isStandard =>
+      identical(this, _JsonDecoder._defaultDecoder) ||
+      (jsonValueDecoderProvider == null &&
+          jsomMapDecoderProvider == null &&
+          jsomMapDecoder == null &&
+          jsomMapDecoderAsyncProvider == null &&
+          jsomMapDecoderAsync == null &&
+          iterableCaster == null &&
+          mapCaster == null &&
+          !forceDuplicatedEntitiesAsID &&
+          autoResetEntityCache &&
+          entityCache is JsonEntityCacheSimple);
+
   @override
   void resetEntityCache() {
     entityCache.clearCachedEntities();
@@ -1962,7 +1993,7 @@ class _JsonDecoder extends dart_convert.Converter<String, Object?>
 
     var json = dart_convert.json.decode(encodedJson);
 
-    if (typeInfo.isAnyType) {
+    if (typeInfo.isAnyType && isStandard) {
       return json as T;
     }
 
@@ -2007,7 +2038,7 @@ class _JsonDecoder extends dart_convert.Converter<String, Object?>
 
     var json = dart_convert.json.decode(encodedJson);
 
-    if (typeInfo.isAnyType) {
+    if (typeInfo.isAnyType && isStandard) {
       return json as T;
     }