diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index bfd65fd..63b06c6 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -8,11 +8,13 @@ dependency_overrides:
     path: ../morphy_annotation
 
 dependencies:
+  json_serializable: ^6.7.1
   meta: any
-
   morphy:
     path: ../morphy
 
+#  morphy: ^1.0.1
+
 dev_dependencies:
   build_runner: ^2.4.6
   test: ^1.24.8
diff --git a/example/test/ex21_custom_constructors_test.dart b/example/test/ex21_custom_constructors_test.dart
index f76afd3..135f1c0 100644
--- a/example/test/ex21_custom_constructors_test.dart
+++ b/example/test/ex21_custom_constructors_test.dart
@@ -15,23 +15,23 @@ part 'ex21_custom_constructors_test.morphy.dart';
 //In this example class A has an underscore thereby hiding its default constructor.
 //Instead we create a function called A_DifferentConstructor.
 
-@morphy
-abstract class $A_ {
+@Morphy(privateConstructor: true)
+abstract class $A {
   String get a;
 }
 
 void main() {
   test("0 default value", () {
-    var a = A_._(a: "my default value");
+    var a = A._(a: "my default value");
     expect(a.a, "my default value");
   });
 
   test("1 default value", () {
-    var a = A_DifferentConstructor();
+    var a = A_Factory();
     expect(a.a, "my default value");
   });
 }
 
-A_ A_DifferentConstructor() {
-  return A_._(a: "my default value");
+A A_Factory() {
+  return A._(a: "my default value");
 }
diff --git a/example/test/ex21_custom_constructors_test.morphy.dart b/example/test/ex21_custom_constructors_test.morphy.dart
index 983d852..8c4b489 100644
--- a/example/test/ex21_custom_constructors_test.morphy.dart
+++ b/example/test/ex21_custom_constructors_test.morphy.dart
@@ -7,27 +7,27 @@ part of 'ex21_custom_constructors_test.dart';
 // **************************************************************************
 
 ///
-class A_ extends $A_ {
+class A extends $A {
   final String a;
 
   ///
-  A_._({
+  A._({
     required this.a,
   });
-  String toString() => "(A_-a:${a.toString()})";
+  String toString() => "(A-a:${a.toString()})";
   int get hashCode => hashObjects([a.hashCode]);
   bool operator ==(Object other) =>
       identical(this, other) ||
-      other is A_ && runtimeType == other.runtimeType && a == other.a;
-  A_ copyWith_A_({
+      other is A && runtimeType == other.runtimeType && a == other.a;
+  A copyWith_A({
     Opt<String>? a,
   }) {
-    return A_._(
+    return A._(
       a: a == null ? this.a as String : a.value as String,
     );
   }
 }
 
-extension $A__changeTo_E on $A_ {}
+extension $A_changeTo_E on $A {}
 
-enum A_$ { a }
+enum A$ { a }
diff --git a/example/test/ex46_json_test.dart b/example/test/ex46_json_test.dart
index cc24450..ce41b04 100644
--- a/example/test/ex46_json_test.dart
+++ b/example/test/ex46_json_test.dart
@@ -1,6 +1,5 @@
 // ignore_for_file: unnecessary_cast
 
-import 'package:json_annotation/json_annotation.dart';
 import 'package:test/test.dart';
 import 'package:morphy/morphy.dart';
 
diff --git a/example/test/ex46_json_test.g.dart b/example/test/ex46_json_test.g.dart
deleted file mode 100644
index 8fc15c8..0000000
--- a/example/test/ex46_json_test.g.dart
+++ /dev/null
@@ -1,15 +0,0 @@
-// GENERATED CODE - DO NOT MODIFY BY HAND
-
-part of 'ex46_json_test.dart';
-
-// **************************************************************************
-// JsonSerializableGenerator
-// **************************************************************************
-
-Pet _$PetFromJson(Map<String, dynamic> json) => Pet(
-      kind: json['kind'] as String,
-    );
-
-Map<String, dynamic> _$PetToJson(Pet instance) => <String, dynamic>{
-      'kind': instance.kind,
-    };
diff --git a/example/test/ex46_json_test.morphy.dart b/example/test/ex46_json_test.morphy.dart
index e164bb5..8d64dce 100644
--- a/example/test/ex46_json_test.morphy.dart
+++ b/example/test/ex46_json_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'ex46_json_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Pet extends $Pet {
   final String kind;
 
@@ -45,8 +47,8 @@ class Pet extends $Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex47_json_inheritance_test.morphy.dart b/example/test/ex47_json_inheritance_test.morphy.dart
index 6f777ea..f662af7 100644
--- a/example/test/ex47_json_inheritance_test.morphy.dart
+++ b/example/test/ex47_json_inheritance_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'ex47_json_inheritance_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class A extends $A {
   final String id;
 
@@ -54,8 +56,8 @@ class A extends $A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -98,7 +100,9 @@ enum A$ { id }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class B extends $B implements A {
   final String id;
 
@@ -147,8 +151,8 @@ class B extends $B implements A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -173,7 +177,9 @@ enum B$ { id }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class C extends $C implements A {
   final String id;
   final List<int> items;
@@ -230,8 +236,8 @@ class C extends $C implements A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex48_json_with_subtype_test.morphy.dart b/example/test/ex48_json_with_subtype_test.morphy.dart
index a96d226..57477b2 100644
--- a/example/test/ex48_json_with_subtype_test.morphy.dart
+++ b/example/test/ex48_json_with_subtype_test.morphy.dart
@@ -9,7 +9,9 @@ part of 'ex48_json_with_subtype_test.dart';
 /// Every subtype needs to also implement toJson & fromJson
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class A extends $A {
   final String id;
   final X x;
@@ -60,8 +62,8 @@ class A extends $A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -82,7 +84,9 @@ enum A$ { id, x, xs }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class X extends $X {
   final List<int> items;
 
@@ -121,8 +125,8 @@ class X extends $X {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex50_json_inheritance_generic_test.morphy.dart b/example/test/ex50_json_inheritance_generic_test.morphy.dart
index 7f5e15b..4fda164 100644
--- a/example/test/ex50_json_inheritance_generic_test.morphy.dart
+++ b/example/test/ex50_json_inheritance_generic_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'ex50_json_inheritance_generic_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class A extends $A {
   final String id;
 
@@ -45,8 +47,8 @@ class A extends $A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -79,7 +81,10 @@ class B_Generics_Sing {
   B_Generics_Sing._internal() {}
 }
 
-@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
+@JsonSerializable(
+  explicitToJson: true,
+  genericArgumentFactories: true,
+)
 class B<T> extends $B<T> implements A {
   final String id;
   final T blah;
@@ -139,8 +144,8 @@ class B<T> extends $B<T> implements A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -162,7 +167,9 @@ enum B$ { id, blah }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class X extends $X {
   final String xyz;
 
@@ -199,8 +206,8 @@ class X extends $X {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex51_json_inheritance_generic_from_test.morphy.dart b/example/test/ex51_json_inheritance_generic_from_test.morphy.dart
index 20bf575..f34dd4e 100644
--- a/example/test/ex51_json_inheritance_generic_from_test.morphy.dart
+++ b/example/test/ex51_json_inheritance_generic_from_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'ex51_json_inheritance_generic_from_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class A extends $A {
   final String id;
 
@@ -52,8 +54,8 @@ class A extends $A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -96,7 +98,10 @@ class B_Generics_Sing {
   B_Generics_Sing._internal() {}
 }
 
-@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
+@JsonSerializable(
+  explicitToJson: true,
+  genericArgumentFactories: true,
+)
 class B<T> extends $B<T> implements A {
   final String id;
   final T blah;
@@ -156,8 +161,8 @@ class B<T> extends $B<T> implements A {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -179,7 +184,9 @@ enum B$ { id, blah }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class X extends $X {
   final String xyz;
 
@@ -216,8 +223,8 @@ class X extends $X {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex52_json_inheritance_generic_test.morphy.dart b/example/test/ex52_json_inheritance_generic_test.morphy.dart
index 6e7ea2c..3a5f007 100644
--- a/example/test/ex52_json_inheritance_generic_test.morphy.dart
+++ b/example/test/ex52_json_inheritance_generic_test.morphy.dart
@@ -16,7 +16,10 @@ class A_Generics_Sing {
   A_Generics_Sing._internal() {}
 }
 
-@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
+@JsonSerializable(
+  explicitToJson: true,
+  genericArgumentFactories: true,
+)
 class A<T1> extends $A<T1> {
   final T1 id;
 
@@ -71,8 +74,8 @@ class A<T1> extends $A<T1> {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -132,7 +135,10 @@ class B_Generics_Sing {
   B_Generics_Sing._internal() {}
 }
 
-@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
+@JsonSerializable(
+  explicitToJson: true,
+  genericArgumentFactories: true,
+)
 class B<T1, T2> extends $B<T1, T2> implements A<T1> {
   final T1 id;
   final T1 valT1;
@@ -207,8 +213,8 @@ class B<T1, T2> extends $B<T1, T2> implements A<T1> {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -258,7 +264,10 @@ class C_Generics_Sing {
   C_Generics_Sing._internal() {}
 }
 
-@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
+@JsonSerializable(
+  explicitToJson: true,
+  genericArgumentFactories: true,
+)
 class C<T1, T2> extends $C<T1, T2> implements B<T1, T2> {
   final T1 id;
   final T1 valT1;
@@ -345,8 +354,8 @@ class C<T1, T2> extends $C<T1, T2> implements B<T1, T2> {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/ex53_abstract_json_test.dart b/example/test/ex53_abstract_json_test.dart
new file mode 100644
index 0000000..f49f1ef
--- /dev/null
+++ b/example/test/ex53_abstract_json_test.dart
@@ -0,0 +1,44 @@
+// ignore_for_file: unnecessary_cast
+
+import 'package:test/test.dart';
+import 'package:morphy/morphy.dart';
+
+part 'ex53_abstract_json_test.g.dart';
+
+part 'ex53_abstract_json_test.morphy.dart';
+
+@Morphy(generateJson: true, explicitSubTypes: [$Todo2_complete, $Todo2_incomplete])
+abstract class $$Todo2 {
+  String get title;
+
+  String? get id;
+
+  String get description;
+}
+
+@Morphy(generateJson: true)
+abstract class $Todo2_incomplete implements $$Todo2 {}
+
+@Morphy(generateJson: true)
+abstract class $Todo2_complete implements $$Todo2 {
+  DateTime get completedDate;
+}
+
+main() {
+  test("1 toJson as A", () {
+    var todoObjects = [Todo2_complete(title: "Todo2_complete", description: "description", completedDate: DateTime(2023, 11, 1)), Todo2_incomplete(title: "Todo2_incomplete", description: "description")];
+
+    var resultInJsonFormat = todoObjects.map((todo2) => todo2.toJson_2()).toList();
+
+    var expectedJson = [
+      {'title': 'Todo2_complete', 'id': null, 'description': 'description', 'completedDate': '2023-11-01T00:00:00.000', '_className_': 'Todo2_complete'},
+      {'title': 'Todo2_incomplete', 'id': null, 'description': 'description', '_className_': 'Todo2_incomplete'}
+    ];
+
+    expect(resultInJsonFormat, expectedJson);
+
+    var resultXObjects = expectedJson.map((json) => Todo2.fromJson(json)).toList();
+
+    expect(resultXObjects, todoObjects);
+  });
+}
diff --git a/example/test/ex54_default_constructor_json_test.dart b/example/test/ex54_default_constructor_json_test.dart
new file mode 100644
index 0000000..3b0b278
--- /dev/null
+++ b/example/test/ex54_default_constructor_json_test.dart
@@ -0,0 +1,40 @@
+import 'package:morphy/morphy.dart';
+
+part 'ex54_default_constructor_json_test.g.dart';
+
+part 'ex54_default_constructor_json_test.morphy.dart';
+
+@Morphy(generateJson: true, explicitSubTypes: [$Todo2_complete, $Todo2_incomplete])
+abstract class $$Todo2 {
+  String get title;
+
+  String get id;
+
+  String get description;
+}
+
+@Morphy(generateJson: true, privateConstructor: true)
+abstract class $Todo2_incomplete implements $$Todo2 {}
+
+@Morphy(generateJson: true)
+abstract class $Todo2_complete implements $$Todo2 {
+  DateTime get completedDate;
+}
+
+Todo2_incomplete todo2_incomplete_Factory({
+  required String title,
+  String? id,
+  String description = '',
+}) {
+  assert(
+    id == null || id.isNotEmpty,
+    'id must either be null or not empty',
+  );
+  var _id = id ?? "xxx";
+
+  return Todo2_incomplete._(
+    id: _id,
+    title: title,
+    description: description,
+  );
+}
diff --git a/example/test/ex54_x_deleteme.dart b/example/test/ex54_x_deleteme.dart
new file mode 100644
index 0000000..07c35b9
--- /dev/null
+++ b/example/test/ex54_x_deleteme.dart
@@ -0,0 +1,15 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'ex54_x_deleteme.g.dart';
+
+@JsonSerializable(constructor: "blah")
+class Person {
+  final String firstName, lastName;
+  final DateTime? dateOfBirth;
+
+  Person.blah({required this.firstName, required this.lastName, this.dateOfBirth});
+
+  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
+
+  Map<String, dynamic> toJson() => _$PersonToJson(this);
+}
diff --git a/example/test/ex8_enums_test.morphy.dart b/example/test/ex8_enums_test.morphy.dart
index a8f2382..10aa1ab 100644
--- a/example/test/ex8_enums_test.morphy.dart
+++ b/example/test/ex8_enums_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'ex8_enums_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Pet extends $Pet {
   final String type;
   final eBlim blim;
@@ -52,8 +54,8 @@ class Pet extends $Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/example/test/readme.dart b/example/test/readme.dart
deleted file mode 100644
index e69de29..0000000
diff --git a/example/test/readme_test.dart b/example/test/readme_test.dart
index f594e1e..f25dd90 100644
--- a/example/test/readme_test.dart
+++ b/example/test/readme_test.dart
@@ -209,6 +209,9 @@ main() {
 
     var resultXObjects = expectedJson.map((e) => X.fromJson(e)).toList();
 
+
     expect(resultXObjects, xObjects);
   });
+  
+
 }
diff --git a/example/test/readme_test.morphy.dart b/example/test/readme_test.morphy.dart
index 37916d5..4be698e 100644
--- a/example/test/readme_test.morphy.dart
+++ b/example/test/readme_test.morphy.dart
@@ -8,7 +8,9 @@ part of 'readme_test.dart';
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Pet extends $Pet {
   final String name;
   final int age;
@@ -56,8 +58,8 @@ class Pet extends $Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -98,7 +100,9 @@ enum Pet$ { name, age }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class FrankensteinsDogCat extends $FrankensteinsDogCat implements Dog, Cat {
   final double whiskerLength;
   final String woofSound;
@@ -212,8 +216,8 @@ class FrankensteinsDogCat extends $FrankensteinsDogCat implements Dog, Cat {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -238,7 +242,9 @@ enum FrankensteinsDogCat$ { whiskerLength, woofSound, name, age }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Cat extends $Cat implements Pet {
   final double whiskerLength;
   final String name;
@@ -306,8 +312,8 @@ class Cat extends $Cat implements Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -332,7 +338,9 @@ enum Cat$ { whiskerLength, name, age }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Dog extends $Dog implements Pet {
   final String woofSound;
   final String name;
@@ -400,8 +408,8 @@ class Dog extends $Dog implements Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -426,7 +434,9 @@ enum Dog$ { woofSound, name, age }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Fish extends $Fish implements Pet {
   final eFishColour fishColour;
   final String name;
@@ -494,8 +504,8 @@ class Fish extends $Fish implements Pet {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -556,7 +566,7 @@ class A_ extends $A_ {
   final DateTime timestamp;
 
   ///
-  A_._({
+  A_({
     required this.val,
     required this.timestamp,
   });
@@ -573,7 +583,7 @@ class A_ extends $A_ {
     Opt<String>? val,
     Opt<DateTime>? timestamp,
   }) {
-    return A_._(
+    return A_(
       val: val == null ? this.val as String : val.value as String,
       timestamp: timestamp == null
           ? this.timestamp as DateTime
@@ -624,7 +634,9 @@ enum B$ { val, optional }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class X extends $X {
   final String val;
 
@@ -670,8 +682,8 @@ class X extends $X {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -718,7 +730,9 @@ enum X$ { val }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Y extends $Y implements X {
   final String val;
   final int valY;
@@ -779,8 +793,8 @@ class Y extends $Y implements X {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -817,7 +831,9 @@ enum Y$ { val, valY }
 
 ///
 
-@JsonSerializable(explicitToJson: true)
+@JsonSerializable(
+  explicitToJson: true,
+)
 class Z extends $Z implements Y {
   final String val;
   final int valY;
@@ -892,8 +908,8 @@ class Z extends $Z implements Y {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns) {
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]) {
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/morphy/CHANGELOG.md b/morphy/CHANGELOG.md
index 282f44c..6e36a7a 100644
--- a/morphy/CHANGELOG.md
+++ b/morphy/CHANGELOG.md
@@ -1,3 +1,16 @@
+## 1.0.4
+- Relaxed dependency versions
+- Fixed bug for abstract class json serialize & deserialize
+
+## 1.0.3
+- Relaxed analyzer requiremenst to 6.0.0
+
+## 1.0.2
+- Added jsonserialization annotation dependency included in morphy
+
+## 1.0.1
+- Added jsonserialization dependency included in morphy
+
 ## 1.0.0+1
 - Updated documentation
 
diff --git a/morphy/README.md b/morphy/README.md
index 3867c49..f63400e 100644
--- a/morphy/README.md
+++ b/morphy/README.md
@@ -164,6 +164,15 @@ In order to convert the object to Json specify the `generateJson`.
     @Morphy(generateJson: true)
     abstract class $Pet {
 
+Add the import statement, part file & the pubspec dependencies
+
+    import 'package:json_annotation/json_annotation.dart';
+    
+    part 'Pets.g.dart';
+
+    json_serializable:
+    json_annotation:
+
 Then use the toJson_2 method to generate the JSON
 
     var json = flossy.toJson_2({});
@@ -241,15 +250,16 @@ We also allow multiple inheritance.
 
 ### Custom Constructors
 
-To allow custom constructors you can simply create a function that creates a new class. 
-If you'd like to hide the automatic constructor end your function with an underscore.
+To allow custom constructors you can simply create a factory function that creates a new class. 
+If you'd like to hide the automatic constructor set the `privateConstructor` on the Morphy annotation to true.
 If you hide the constructor the custom one should belong in the same file that you defined your class.
 
-    A_ a_Constructor(String val){
-      return A_._(val: val, timestamp: DateTime(2023,11,25));
+    @Morphy(privateConstructor: true)
+    A a_Factory(String val){
+      return A._(val: val, timestamp: DateTime(2023,11,25));
     }
 
-    var a = a_Constructor("my value");
+    var a = a_Factory("my value");
 
     expect(a.timestamp, DateTime(2023,11,25));
 
diff --git a/morphy/lib/morphy.dart b/morphy/lib/morphy.dart
index 1721f44..fe21a0b 100644
--- a/morphy/lib/morphy.dart
+++ b/morphy/lib/morphy.dart
@@ -2,3 +2,5 @@ export 'package:morphy_annotation/morphy_annotation.dart';
 export 'package:morphy_annotation/opt.dart';
 export 'package:morphy_annotation/List_E.dart';
 export 'package:quiver/core.dart' show hashObjects;
+export 'package:json_serializable/json_serializable.dart';
+export 'package:json_annotation/json_annotation.dart';
diff --git a/morphy/lib/src/MorphyGenerator.dart b/morphy/lib/src/MorphyGenerator.dart
index f75ad62..2f8826f 100644
--- a/morphy/lib/src/MorphyGenerator.dart
+++ b/morphy/lib/src/MorphyGenerator.dart
@@ -131,6 +131,7 @@ class MorphyGenerator<TValueT extends MorphyX> extends GeneratorForAnnotationX<T
       classGenerics,
       hasConstConstructor,
       annotation.read('generateJson').boolValue,
+      annotation.read('privateConstructor').boolValue,
       typesExplicit,
     ));
 
diff --git a/morphy/lib/src/createMorphy.dart b/morphy/lib/src/createMorphy.dart
index 0958936..393c953 100644
--- a/morphy/lib/src/createMorphy.dart
+++ b/morphy/lib/src/createMorphy.dart
@@ -12,6 +12,7 @@ String createMorphy(
   List<NameTypeClassComment> classGenerics,
   bool hasConstContructor,
   bool generateJson,
+  bool hasPrivateConstructor,
   List<Interface> explicitForJson,
 ) {
   //recursively go through otherClasses and get my fieldnames &
@@ -21,13 +22,10 @@ String createMorphy(
 
   sb.write(getClassComment(interfacesFromImplements, classComment));
 
+  //move this into a helper class!
   if (generateJson) {
     sb.writeln(createJsonSingleton(classNameTrim, classGenerics));
-    // sb.writeln("Map<String, dynamic Function(Object? json)> jsonToGenericFunctions_$classNameTrim = {};");
-    if (classGenerics.length > 0) //
-      sb.writeln("@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)");
-    else
-      sb.writeln("@JsonSerializable(explicitToJson: true)");
+    sb.writeln(createJsonHeader(className, classGenerics, hasPrivateConstructor));
   }
 
   sb.write(getClassDefinition(isAbstract, className));
@@ -45,13 +43,14 @@ String createMorphy(
     sb.write(getImplements(interfacesFromImplements, className));
   }
   sb.writeln(" {");
-  var constructorName = getConstructorName(classNameTrim);
   if (isAbstract) {
     sb.writeln(getPropertiesAbstract(allFields));
   } else {
     sb.writeln(getProperties(allFields));
     sb.write(getClassComment(interfacesFromImplements, classComment));
 
+    //constructor
+    var constructorName = getConstructorName(classNameTrim, hasPrivateConstructor);
     if (allFields.isEmpty) {
       sb.writeln("${constructorName}();");
     } else {
@@ -59,6 +58,12 @@ String createMorphy(
       sb.writeln(getConstructorRows(allFields));
       sb.writeln("});");
 
+      if (hasPrivateConstructor && generateJson) {
+        sb.writeln("${constructorName}.forJsonDoNotUse({");
+        sb.writeln(getConstructorRows(allFields));
+        sb.writeln("});");
+      }
+
       if (hasConstContructor) {
         sb.writeln("const ${constructorName}.constant({");
         sb.writeln(getConstructorRows(allFields));
@@ -90,6 +95,7 @@ String createMorphy(
         isClassAbstract: isAbstract,
         interfaceGenerics: x.typeParams,
         isExplicitSubType: x.isExplicitSubType,
+        hasPrivateConstructor: hasPrivateConstructor,
       ),
     );
   });
@@ -120,6 +126,7 @@ String createMorphy(
         isClassAbstract: isAbstract,
         interfaceGenerics: x.typeParams,
         isExplicitSubType: x.isExplicitSubType,
+        hasPrivateConstructor: hasPrivateConstructor,
       ),
     );
   });
diff --git a/morphy/lib/src/helpers.dart b/morphy/lib/src/helpers.dart
index 6f85ac6..0e0b075 100644
--- a/morphy/lib/src/helpers.dart
+++ b/morphy/lib/src/helpers.dart
@@ -218,6 +218,21 @@ String getEquals(List<NameType> fields, String className) {
   return sb.toString();
 }
 
+String createJsonHeader(String className, List<NameType> classGenerics, bool privateConstructor) {
+  var sb = StringBuffer();
+
+  if (!className.startsWith("\$\$")) {
+    var jsonConstructorName = privateConstructor ? "constructor: 'forJsonDoNotUse'" : "";
+
+    if (classGenerics.length > 0) //
+      sb.writeln("@JsonSerializable(explicitToJson: true, genericArgumentFactories: true, $jsonConstructorName)");
+    else
+      sb.writeln("@JsonSerializable(explicitToJson: true, $jsonConstructorName)");
+  }
+
+  return sb.toString();
+}
+
 ///[classFields] & [interfaceFields] should be renamed
 /// for changeTo [classFields] and [className] is what we are copying from
 /// and [interfaceFields] and [interfaceName] is what we are copying to
@@ -229,6 +244,7 @@ String getCopyWith({
   required String className,
   required bool isClassAbstract,
   required List<NameType> interfaceGenerics,
+  required bool hasPrivateConstructor,
   bool isExplicitSubType = false, //for where we specify the explicit subtypes for changeTo
 }) {
   var sb = StringBuffer();
@@ -293,7 +309,7 @@ String getCopyWith({
   if (isExplicitSubType) {
     sb.writeln("return ${getDataTypeWithoutDollars(interfaceName)}(");
   } else {
-    if (className.endsWith("_")) {
+    if (hasPrivateConstructor) {
       sb.writeln("return $classNameTrimmed._(");
     } else {
       sb.writeln("return $classNameTrimmed(");
@@ -348,8 +364,10 @@ String getCopyWith({
 //  toString() => "${this.type}|${this.paramNameType}";
 //}
 
-String getConstructorName(String trimmedClassName) {
-  return trimmedClassName[trimmedClassName.length - 1] == "_" ? "$trimmedClassName._" : trimmedClassName;
+String getConstructorName(String trimmedClassName, bool hasCustomConstructor) {
+  return hasCustomConstructor //
+      ? "$trimmedClassName._"
+      : trimmedClassName;
 }
 
 String generateFromJsonHeader(String className) {
@@ -359,11 +377,12 @@ String generateFromJsonHeader(String className) {
 }
 
 String generateFromJsonBody(String className, List<NameType> generics, List<Interface> interfaces) {
-  var _className = "${className.replaceFirst("\$", "")}";
-  var _class = Interface(_className, generics.map((e) => e.type ?? "").toList(), generics.map((e) => e.name).toList(), []);
+  var _class = Interface(className, generics.map((e) => e.type ?? "").toList(), generics.map((e) => e.name).toList(), []);
   var _classes = [...interfaces, _class];
 
-  var body = _classes.mapIndexed((i, c) {
+  var body = _classes //
+      .where((c) => !c.interfaceName.startsWith("\$\$"))
+      .mapIndexed((i, c) {
     var _interfaceName = "${c.interfaceName.replaceFirst("\$", "")}";
     var start = i == 0 ? "if" : "} else if";
     var genericTypes = c.typeParams.map((e) => "'_${e.name}_'").join(",");
@@ -385,6 +404,8 @@ String generateFromJsonBody(String className, List<NameType> generics, List<Inte
     }
   }).join("\n");
 
+  var _className = className.replaceFirst("\$", "").replaceFirst("\$", "");
+
   var end = """    } else {
       throw UnsupportedError("The _className_ '\${json['_className_']}' is not supported by the ${_className}.fromJson constructor.");
     }
@@ -395,6 +416,10 @@ String generateFromJsonBody(String className, List<NameType> generics, List<Inte
 }
 
 String generateToJson(String className, List<NameType> generics) {
+  if (className.startsWith("\$\$")) {
+    return "Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]);";
+  }
+
   var _className = "${className.replaceFirst("\$", "")}";
 
   var getGenericFn = generics //
@@ -413,8 +438,8 @@ String generateToJson(String className, List<NameType> generics) {
   // ignore: unused_field
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns){
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]){
+    this._fns = fns ?? {};
     return toJson();
   }
 
diff --git a/morphy/pubspec.yaml b/morphy/pubspec.yaml
index c079d23..3405ec2 100644
--- a/morphy/pubspec.yaml
+++ b/morphy/pubspec.yaml
@@ -1,22 +1,24 @@
 name: morphy
 description: Provides a clean class definition with extra functionality including; copy with, json serializable, tostring, equals that supports inheritance and polymorphism
-version: 1.0.0+1
+version: 1.0.4
 homepage: https://github.com/atreeon/morphy
 
 environment:
   sdk: ">=3.1.3 <4.0.0"
 
-#dependency_overrides:
-#  morphy_annotation:
-#    path: ../morphy_annotation
+dependency_overrides:
+  morphy_annotation:
+    path: ../morphy_annotation
 
 dependencies:
-  morphy_annotation: ^1.0.0
-  analyzer: '>=6.3.0 <=7.0.0'
+  morphy_annotation: ^1.0.4
+  analyzer: '>=6.0.0 <=7.0.0'
   build: ^2.1.0
   source_gen: ^1.1.1
   dartx: ^1.2.0
   quiver: ^3.2.1
+  json_serializable: ^6.3.2
+  json_annotation: ^4.7.0
 
 dev_dependencies:
   build_runner: ^2.4.6
diff --git a/morphy/test/helpers_test.dart b/morphy/test/helpers_test.dart
index f14c5a4..2518a11 100644
--- a/morphy/test/helpers_test.dart
+++ b/morphy/test/helpers_test.dart
@@ -2,8 +2,8 @@
 import 'package:morphy/src/common/NameType.dart';
 import 'package:morphy/src/common/classes.dart';
 import 'package:morphy/src/common/formatCodeStringForComparison.dart';
-import 'package:test/test.dart';
 import 'package:morphy/src/helpers.dart';
+import 'package:test/test.dart';
 
 var expectS = (String a, String b) => expect(formatCodeStringForComparison(a), formatCodeStringForComparison(b));
 
@@ -456,12 +456,12 @@ a == other.a && b == other.b && c == other.c;""";
 
   group("getConstructorName", () {
     test("1n normalc", () {
-      var result = getConstructorName("MyClass");
+      var result = getConstructorName("MyClass", false);
       expectS(result, "MyClass");
     });
 
     test("2n privatec", () {
-      var result = getConstructorName("MyClass_");
+      var result = getConstructorName("MyClass_", true);
 
       expectS(result, "MyClass_._");
     });
@@ -501,6 +501,7 @@ a == other.a && b == other.b && c == other.c;""";
         className: "A",
         isClassAbstract: true,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """A copyWith_A({
 Opt<String>? a,
@@ -520,6 +521,7 @@ Opt<String>? a,
         className: "B",
         isClassAbstract: true,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_A({
 Opt<int>? a,
@@ -538,6 +540,7 @@ Opt<int>? a,
         className: "A",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """A copyWith_A({
 Opt<String>? a,
@@ -561,6 +564,7 @@ a: a == null ? this.a as String : a.value as String,
         className: "B",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_A({
 Opt<String>? a,
@@ -586,6 +590,7 @@ b: (this as B).b,
         className: "B",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_B({
 Opt<String>? a,
@@ -612,6 +617,7 @@ b: b == null ? this.b as T1 : b.value as T1,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_A({
 Opt<String>? a,
@@ -639,6 +645,7 @@ c: (this as C).c,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_B({
 Opt<String>? a,
@@ -668,6 +675,7 @@ c: (this as C).c,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_C({
 Opt<String>? a,
@@ -695,6 +703,7 @@ c: c == null ? this.c as bool : c.value as bool,
         className: "D",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """D copyWith_A({
 Opt<String>? a,
@@ -720,6 +729,7 @@ b: (this as D).b,
         className: "D",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """D copyWith_B({
 Opt<String>? a,
@@ -746,6 +756,7 @@ b: b == null ? this.b as T1 : b.value as T1,
         className: "D",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """D copyWith_D({
 Opt<String>? a,
@@ -766,6 +777,7 @@ b: b == null ? this.b as T1 : b.value as T1,
         className: "X",
         isClassAbstract: true,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """X copyWith_X(
 );""");
@@ -781,6 +793,7 @@ b: b == null ? this.b as T1 : b.value as T1,
         className: "Y",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """Y copyWith_X(
 ) {
@@ -792,17 +805,17 @@ a: (this as Y).a,
 
     test("14p yy (see ex29_manual) interface with no fields", () {
       var result = getCopyWith(
-        classFields: [
-          NameTypeClassComment("a", "String", null),
-        ],
-        interfaceFields: [
-          NameTypeClassComment("a", "String", null),
-        ],
-        interfaceName: "Y",
-        className: "Y",
-        isClassAbstract: false,
-        interfaceGenerics: [],
-      );
+          classFields: [
+            NameTypeClassComment("a", "String", null),
+          ],
+          interfaceFields: [
+            NameTypeClassComment("a", "String", null),
+          ],
+          interfaceName: "Y",
+          className: "Y",
+          isClassAbstract: false,
+          interfaceGenerics: [],
+          hasPrivateConstructor: false);
       expectS(result, """Y copyWith_Y({
 Opt<String>? a,
 }) {
@@ -824,6 +837,7 @@ a: a == null ? this.a as String : a.value as String,
         className: "A",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """A copyWith_A({
 Opt<Person>? a,
@@ -836,17 +850,17 @@ a: a == null ? this.a as Person : a.value as Person,
 
     test("16p ba (see ex7_manual) where subtypes are used", () {
       var result = getCopyWith(
-        classFields: [
-          NameTypeClassComment("a", "Employee", null),
-        ],
-        interfaceFields: [
-          NameTypeClassComment("a", "Person", null),
-        ],
-        interfaceName: "A",
-        className: "B",
-        isClassAbstract: false,
-        interfaceGenerics: [],
-      );
+          classFields: [
+            NameTypeClassComment("a", "Employee", null),
+          ],
+          interfaceFields: [
+            NameTypeClassComment("a", "Person", null),
+          ],
+          interfaceName: "A",
+          className: "B",
+          isClassAbstract: false,
+          interfaceGenerics: [],
+          hasPrivateConstructor: false);
       expectS(result, """B copyWith_A({
 Opt<Person>? a,
 }) {
@@ -868,6 +882,7 @@ a: a == null ? this.a as Employee : a.value as Employee,
         className: "B",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_B({
 Opt<Employee>? a,
@@ -890,6 +905,7 @@ a: a == null ? this.a as Employee : a.value as Employee,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_A({
 Opt<Person>? a,
@@ -912,6 +928,7 @@ a: a == null ? this.a as Manager : a.value as Manager,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_B({
 Opt<Employee>? a,
@@ -934,6 +951,7 @@ a: a == null ? this.a as Manager : a.value as Manager,
         className: "C",
         isClassAbstract: false,
         interfaceGenerics: [],
+        hasPrivateConstructor: false,
       );
       expectS(result, """C copyWith_C({
 Opt<Manager>? a,
@@ -959,6 +977,7 @@ a: a == null ? this.a as Manager : a.value as Manager,
         interfaceName: "A",
         className: "B",
         isClassAbstract: false,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_A<T1, T2>({
 Opt<T1>? x,
@@ -988,6 +1007,7 @@ z: (this as B).z,
         interfaceName: "B",
         className: "B",
         isClassAbstract: false,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_B({
 Opt<int>? x,
@@ -1014,6 +1034,7 @@ z: z == null ? this.z as String : z.value as String,
         interfaceName: "A",
         className: "A",
         isClassAbstract: true,
+        hasPrivateConstructor: false,
       );
       expectS(result, """A copyWith_A<T>({
 Opt<T>? x,
@@ -1034,6 +1055,7 @@ Opt<T>? x,
         interfaceName: "A",
         className: "B",
         isClassAbstract: false,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_A<T>({
 Opt<T>? x,
@@ -1054,14 +1076,15 @@ y: (this as B).y,
           NameTypeClassComment("a", "String", null),
         ],
         interfaceGenerics: [],
-        interfaceName: "A_",
-        className: "A_",
+        interfaceName: "A",
+        className: "A",
         isClassAbstract: false,
+        hasPrivateConstructor: true,
       );
-      expectS(result, """A_ copyWith_A_({
+      expectS(result, """A copyWith_A({
 Opt<String>? a,
 }) {
-return A_._(
+return A._(
 a: a == null ? this.a as String : a.value as String,
 );
 }""");
@@ -1079,6 +1102,7 @@ a: a == null ? this.a as String : a.value as String,
         interfaceName: "X",
         className: "X",
         isClassAbstract: false,
+        hasPrivateConstructor: false,
       );
       expectS(result, """X copyWith_X({
 Opt<bool Function(\$X)>? fn,
@@ -1103,6 +1127,7 @@ fn: fn == null ? this.fn as bool Function(\$X) : fn.value as bool Function(\$X),
         className: "A",
         isClassAbstract: false,
         isExplicitSubType: true,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B changeTo_B({
 required String y,
@@ -1130,6 +1155,7 @@ x: x == null ? this.x as String : x.value as String,
         className: "A",
         isClassAbstract: false,
         isExplicitSubType: true,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B changeTo_B({
 required String y,
@@ -1159,6 +1185,7 @@ x: x == null ? this.x as String : x.value as String,
         className: "A",
         isClassAbstract: false,
         isExplicitSubType: true,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B changeTo_B({
 required String y,
@@ -1189,6 +1216,7 @@ x: x == null ? this.x as String : x.value as String,
         interfaceName: "\$B",
         className: "\$B",
         isClassAbstract: false,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B copyWith_B({
 Opt<String>? x,
@@ -1217,6 +1245,7 @@ z: z == null ? this.z as Z : z.value as Z,
         className: "\$\$Super",
         isClassAbstract: true,
         isExplicitSubType: true,
+        hasPrivateConstructor: false,
       );
       expectS(result, """B changeTo_B({
 required String y,
@@ -1340,12 +1369,35 @@ x: x == null ? this.x as String : x.value as String,
 
       expectS(result, expected);
     });
+
+    test("5s abstract superclass", () {
+      var result = generateFromJsonBody(
+        "\$\$A",
+        [],
+        [
+          Interface("\$B", ["", "", ""], ["T", "T2", "T3"], []),
+        ],
+      );
+
+      var expected = """
+  if (json['_className_'] == "B") {
+    var fn_fromJson = getFromJsonToGenericFn(
+      B_Generics_Sing().fns,
+      json,
+      ['_T_','_T2_','_T3_'],
+    );
+    return fn_fromJson(json);
+  } else {
+    throw UnsupportedError("The _className_ '\${json['_className_']}' is not supported by the A.fromJson constructor.");
+  }
+}""";
+
+      expectS(result, expected);
+    });
   });
 
   group("generateToJson", () {
     //add this based on the generics
-    // Map<String, dynamic> toJson(Object Function(dynamic)? toJson_T) {
-    //   final Map<String, dynamic> data = _$CToJson(this, toJson_T!);
 
     test("1u", () {
       var result = generateToJson("\$Pet", []);
@@ -1353,8 +1405,8 @@ x: x == null ? this.x as String : x.value as String,
       var expected = """// ignore: unused_field\n
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns){
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]){
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -1385,8 +1437,8 @@ x: x == null ? this.x as String : x.value as String,
       var expected = """// ignore: unused_field\n  
   Map<Type, Object? Function(Never)> _fns = {};
 
-  Map<String, dynamic> toJson_2(Map<Type, Object? Function(Never)> fns){
-    this._fns = fns;
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]){
+    this._fns = fns ?? {};
     return toJson();
   }
 
@@ -1409,6 +1461,16 @@ x: x == null ? this.x as String : x.value as String,
 
       expectS(result, expected);
     });
+
+    test("3u abstract class", () {
+      var result = generateToJson("\$\$Pet", []);
+
+      var expected = """
+  Map<String, dynamic> toJson_2([Map<Type, Object? Function(Never)>? fns]);
+""";
+
+      expectS(result, expected);
+    });
   });
 
   group("createJsonSingleton", () {
@@ -1470,6 +1532,29 @@ class C_Generics_Sing {
     });
   });
 
+  group("createJsonHeader", () {
+    test("1w non abstract, no generics, private constructor", () {
+      var result = createJsonHeader("\$Pet", [], true);
+      var expected = "@JsonSerializable(explicitToJson: true, constructor: 'forJsonDoNotUse')";
+
+      expectS(result, expected);
+    });
+
+    test("2w abstract", () {
+      var result = createJsonHeader("\$\$Pet", [], true);
+      var expected = "";
+
+      expectS(result, expected);
+    });
+
+    test("3w non abstract, generics, no private constructor", () {
+      var result = createJsonHeader("\$Pet", [NameTypeClass("name", "type", "className")], false);
+      var expected = "@JsonSerializable(explicitToJson: true, genericArgumentFactories: true, )";
+
+      expectS(result, expected);
+    });
+  });
+
 //  group("getCopyWithSignature", () {
 //    test("1p", () {
 //      var result = getCopyWithSignature(
diff --git a/morphy_annotation/CHANGELOG.md b/morphy_annotation/CHANGELOG.md
index 4a1b581..3acdf05 100644
--- a/morphy_annotation/CHANGELOG.md
+++ b/morphy_annotation/CHANGELOG.md
@@ -1,2 +1 @@
-## 1.0.0
-- First published version
\ No newline at end of file
+see morphy
\ No newline at end of file
diff --git a/morphy_annotation/lib/annotations.dart b/morphy_annotation/lib/annotations.dart
index bcdd672..b235896 100644
--- a/morphy_annotation/lib/annotations.dart
+++ b/morphy_annotation/lib/annotations.dart
@@ -14,6 +14,8 @@ class Morphy implements MorphyX {
 
   final bool generateJson;
 
+  final bool privateConstructor;
+
   /// {@template MorphyX}
   /// ### normal class; prepend class with a single dollar & make abstract
   /// ```
@@ -91,16 +93,19 @@ class Morphy implements MorphyX {
   const Morphy({
     this.explicitSubTypes = null,
     this.generateJson = false,
+    this.privateConstructor = false,
   });
 }
 
 class Morphy2 implements MorphyX {
   final List<Type>? explicitSubTypes;
   final bool generateJson;
+  final bool privateConstructor;
 
   const Morphy2({
     this.explicitSubTypes = null,
     this.generateJson = false,
+    this.privateConstructor = false,
   });
 }
 
diff --git a/morphy_annotation/pubspec.yaml b/morphy_annotation/pubspec.yaml
index e355b1e..d1f0451 100644
--- a/morphy_annotation/pubspec.yaml
+++ b/morphy_annotation/pubspec.yaml
@@ -1,6 +1,6 @@
 name: morphy_annotation
 description: annotation for morphy which provides a clean class definition with extra functionality including; copy with, json serializable, tostring, equals that supports inheritance and polymorphism
-version: 1.0.0
+version: 1.0.4
 homepage: https://github.com/atreeon/morphy
 
 environment:
diff --git a/release/1_dry_run_release.sh b/release/1_dry_run_release.sh
index 6ee67a7..be57626 100755
--- a/release/1_dry_run_release.sh
+++ b/release/1_dry_run_release.sh
@@ -33,7 +33,10 @@ else
 fi
 
 cd ../example
+rm test/*.morphy.dart
+rm test/*.g.dart
 dart pub get
+dart pub run build_runner clean
 dart run build_runner build --delete-conflicting-outputs
 dart pub run test
 cd ../release
diff --git a/release/3_releaseMorphy.sh b/release/3_releaseMorphy.sh
index 7720ee0..4a09c83 100755
--- a/release/3_releaseMorphy.sh
+++ b/release/3_releaseMorphy.sh
@@ -13,7 +13,21 @@ read -p "Is this correct? (y/n): " choice
 
 if [ "$choice" = "y" ]; then
   clear
-  echo "Continuing..."
+  echo "Checking referenced morphy_annotation"
+else
+  exit 0
+fi
+
+versionMorphyAnnotation=$(grep 'morphy_annotation:' "../morphy/pubspec.yaml" | awk '{print $2}')
+echo "Morphy references annotation version $versionMorphyAnnotation"
+echo "morphy_annotation in pub.dev is $versionAnnotationPub"
+echo "local Morphy version is $versionMorphyLocal"
+
+read -p "Is this correct? (y/n): " choice
+
+if [ "$choice" = "y" ]; then
+  clear
+  echo "publish dry run:"
 else
   exit 0
 fi