Sample application.

lib/model/contactCreation.dart

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+class ContactCreation {
+  final dynamic name;
+  final dynamic email;
+  final dynamic phone;
+  final dynamic street;
+  final dynamic street2;
+  final dynamic city;
+  final dynamic image1920;
+
+  ContactCreation({
+    required this.name,
+    required this.email,
+    required this.phone,
+    required this.street,
+    required this.street2,
+    required this.city,
+    required this.image1920,
+  });
+
+  factory ContactCreation.fromJson(Map<dynamic, dynamic> json) {
+    getCountry(){
+      if (json['country_id'] != null){
+        return json['country_id']['name'];
+      }
+      else{
+        return null;
+      }
+    }
+    return ContactCreation(
+      name: json['name'],
+      email: json['email'],
+      phone: json['phone'],
+      street: json['street'],
+      street2: json['street2'],
+      city: json['city'],
+      image1920: json['image_1920'],
+    );
+  }
+  Map<dynamic, dynamic> toJson() {
+    return {
+      'name': name,
+      'email': email,
+      'phone': phone,
+      'street': street,
+      'street2': street2,
+      'city': city,
+      'image_1920': image1920,
+    };
+  }
+}

lib/model/contactDetail.dart

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+class ContactDetail {
+  final int id;
+  final dynamic name;
+  final dynamic email;
+  final dynamic phone;
+  final dynamic image1920;
+  final dynamic street;
+  final dynamic street2;
+  final dynamic city;
+  final dynamic country;
+
+  ContactDetail({
+    required this.id,
+    required this.name,
+    required this.email,
+    required this.phone,
+    required this.image1920,
+    required this.street,
+    required this.street2,
+    required this.city,
+    required this.country,
+  });
+
+  factory ContactDetail.fromJson(Map<dynamic, dynamic> json) {
+    getCountry(){
+      if (json['country_id'] != null){
+        return json['country_id']['name'];
+      }
+      else{
+        return null;
+      }
+    }
+    return ContactDetail(
+      id: json['id'],
+      name: json['name'],
+      email: json['email'],
+      phone: json['phone'],
+      image1920: json['image_1920'],
+      street: json['street'],
+      street2: json['street2'],
+      city: json['city'],
+      country: getCountry(),
+    );
+  }
+  Map<dynamic, dynamic> toJson() {
+    return {
+      'id': id,
+      'name': name,
+      'email': email,
+      'phone': phone,
+      'image1920': image1920,
+      'street': street,
+      'street2': street2,
+      'city': city,
+      'country': country,
+    };
+  }
+}

lib/model/contactList.dart

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+class ContactList {
+  final int id;
+  final String name;
+  final dynamic email;
+  final dynamic image1920;
+
+
+  ContactList({required this.id, required this.name, required this.email, required this.image1920});
+  
+  factory ContactList.fromJson(Map<String, dynamic> json) {
+    return ContactList(
+      id: json['id'],
+      name: json['name'],
+      email: json['email'],
+      image1920: json['image_1920'],
+    );
+  }
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'name': name,
+      'email': email,
+      'image1920': image1920,
+    };
+  }
+
+}