diff --git a/example/my_cart_example.dart b/example/my_cart_example.dart
index 1f78c4b..81ee6b7 100644
--- a/example/my_cart_example.dart
+++ b/example/my_cart_example.dart
@@ -1,16 +1,14 @@
-import 'dart:convert';
-
-import 'package:cubetiq/interfaces.dart';
+import 'package:cubetiq/model.dart';
 
 void main(List<String> args) {
   MyCart.addCart(
-    Cart(1, 'Apple', 1),
+    Cart(id: 1, name: 'Apple', qty: 1),
   );
 
   MyCart.show();
 
   MyCart.addCart(
-    Cart(1, 'Apple', 2),
+    Cart(id: 1, name: 'Apple', qty: 2),
   );
 
   MyCart.show();
@@ -24,15 +22,24 @@ void main(List<String> args) {
   MyCart.show();
 }
 
-class Cart implements ToJson {
+class Cart extends BaseModel<Cart> {
   final int id;
-  final String name;
+  final String? name;
   double qty;
 
-  Cart(this.id, this.name, this.qty);
+  Cart({this.id = -1, this.name, this.qty = 0});
 
   @override
-  Map toJson() {
+  Cart fromMap(Map<String, dynamic> map) {
+    return Cart(
+      id: map['id'],
+      name: map['name'],
+      qty: map['qty'],
+    );
+  }
+
+  @override
+  Map<String, dynamic> toMap() {
     return {
       'id': id,
       'name': name,
@@ -71,7 +78,14 @@ class MyCart {
   }
 
   static void show() {
-    var data = carts.map((key, value) => MapEntry(key, jsonEncode(value)));
+    var data = carts.map((key, value) => MapEntry(key, value));
+    var json = data.map((key, value) => MapEntry(key, value.toJson()));
+    var model = json.map((key, value) => MapEntry(key, Cart().fromJson(value)));
+    print('================ Map =================');
     print('$data');
+    print('================ Json =================');
+    print('$json');
+    print('================ Model =================');
+    print('$model');
   }
 }
diff --git a/lib/model.dart b/lib/model.dart
new file mode 100644
index 0000000..ae1858d
--- /dev/null
+++ b/lib/model.dart
@@ -0,0 +1,3 @@
+library model;
+
+export 'src/model/base.dart';
\ No newline at end of file
diff --git a/lib/src/model/base.dart b/lib/src/model/base.dart
new file mode 100644
index 0000000..e965b88
--- /dev/null
+++ b/lib/src/model/base.dart
@@ -0,0 +1,33 @@
+import 'dart:convert';
+
+abstract class BaseModel<T> {
+  BaseModel();
+
+  Map<String, dynamic> toMap();
+
+  T fromMap(Map<String, dynamic> map);
+
+  T fromJson(String json) {
+    return fromMap(decode(json));
+  }
+
+  @override
+  String toString() {
+    return toMap().toString();
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is BaseModel && other.toMap() == toMap();
+  }
+
+  @override
+  int get hashCode => toMap().hashCode;
+
+  String toJson() => encode(toMap());
+
+  dynamic decode(String json) => jsonDecode(json);
+  String encode(dynamic json) => jsonEncode(json);
+}