diff --git a/jambo/parser/_type_parser.py b/jambo/parser/_type_parser.py
index 66c6245..1dc07d3 100644
--- a/jambo/parser/_type_parser.py
+++ b/jambo/parser/_type_parser.py
@@ -12,7 +12,7 @@ T = TypeVar("T")
 class GenericTypeParser(ABC, Generic[T]):
     json_schema_type: str = None
 
-    type_mappings: dict[str, str] = None
+    type_mappings: dict[str, str] = {}
 
     default_mappings = {
         "default": "default",
@@ -20,14 +20,51 @@ class GenericTypeParser(ABC, Generic[T]):
     }
 
     @abstractmethod
+    def from_properties_impl(
+        self, name: str, properties: dict[str, Any], **kwargs: Unpack[TypeParserOptions]
+    ) -> tuple[T, dict]:
+        """
+        Abstract method to convert properties to a type and its fields properties.
+        :param name: The name of the type.
+        :param properties: The properties of the type.
+        :param kwargs: Additional options for type parsing.
+        :return: A tuple containing the type and its properties.
+        """
+        pass
+
     def from_properties(
         self, name: str, properties: dict[str, Any], **kwargs: Unpack[TypeParserOptions]
-    ) -> tuple[T, dict]: ...
+    ) -> tuple[type, dict]:
+        """
+        Converts properties to a type and its fields properties.
+        :param name: The name of the type.
+        :param properties: The properties of the type.
+        :param kwargs: Additional options for type parsing.
+        :return: A tuple containing the type and its properties.
+        """
+        parsed_type, parsed_properties = self.from_properties_impl(
+            name, properties, **kwargs
+        )
+
+        if not self._validate_default(parsed_type, parsed_properties):
+            raise ValueError(
+                f"Default value {properties.get('default')} is not valid for type {parsed_type.__name__}"
+            )
+
+        return parsed_type, parsed_properties
 
     @classmethod
     def type_from_properties(
         cls, name: str, properties: dict[str, Any], **kwargs: Unpack[TypeParserOptions]
     ) -> tuple[type, dict]:
+        """
+        Factory method to fetch the appropriate type parser based on properties
+        and generates the equivalent type and fields.
+        :param name: The name of the type to be created.
+        :param properties: The properties that define the type.
+        :param kwargs: Additional options for type parsing.
+        :return: A tuple containing the type and its properties.
+        """
         parser = cls._get_impl(properties)
 
         return parser().from_properties(name=name, properties=properties, **kwargs)
@@ -62,9 +99,6 @@ class GenericTypeParser(ABC, Generic[T]):
     def mappings_properties_builder(
         self, properties, **kwargs: Unpack[TypeParserOptions]
     ) -> dict[str, Any]:
-        if self.type_mappings is None:
-            raise NotImplementedError("Type mappings not defined")
-
         if not kwargs.get("required", False):
             properties["default"] = properties.get("default", None)
 
@@ -74,6 +108,20 @@ class GenericTypeParser(ABC, Generic[T]):
             mappings[key]: value for key, value in properties.items() if key in mappings
         }
 
-    def validate_default(self, field_type: type, field_prop: dict, value) -> None:
-        field = Annotated[field_type, Field(**field_prop)]
-        TypeAdapter(field).validate_python(value)
+    @staticmethod
+    def _validate_default(field_type: type, field_prop: dict) -> bool:
+        value = field_prop.get("default")
+
+        if value is None and field_prop.get("default_factory") is not None:
+            value = field_prop["default_factory"]()
+
+        if value is None:
+            return True
+
+        try:
+            field = Annotated[field_type, Field(**field_prop)]
+            TypeAdapter(field).validate_python(value)
+        except Exception as _:
+            return False
+
+        return True
diff --git a/jambo/parser/allof_type_parser.py b/jambo/parser/allof_type_parser.py
index c3a275f..3180ae3 100644
--- a/jambo/parser/allof_type_parser.py
+++ b/jambo/parser/allof_type_parser.py
@@ -9,7 +9,9 @@ class AllOfTypeParser(GenericTypeParser):
 
     json_schema_type = "allOf"
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
         sub_properties = properties.get("allOf", [])
 
         root_type = properties.get("type")
@@ -23,7 +25,7 @@ class AllOfTypeParser(GenericTypeParser):
             sub_properties
         )
 
-        return parser().from_properties(name, combined_properties, **kwargs)
+        return parser().from_properties_impl(name, combined_properties, **kwargs)
 
     @staticmethod
     def _get_type_parser(
diff --git a/jambo/parser/anyof_type_parser.py b/jambo/parser/anyof_type_parser.py
index d617406..55ff3ec 100644
--- a/jambo/parser/anyof_type_parser.py
+++ b/jambo/parser/anyof_type_parser.py
@@ -10,14 +10,16 @@ class AnyOfTypeParser(GenericTypeParser):
 
     json_schema_type = "anyOf"
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
         if "anyOf" not in properties:
             raise ValueError(f"Invalid JSON Schema: {properties}")
 
         if not isinstance(properties["anyOf"], list):
             raise ValueError(f"Invalid JSON Schema: {properties['anyOf']}")
 
-        mapped_properties = dict()
+        mapped_properties = self.mappings_properties_builder(properties, **kwargs)
 
         sub_properties = properties["anyOf"]
 
@@ -26,21 +28,6 @@ class AnyOfTypeParser(GenericTypeParser):
             for subProperty in sub_properties
         ]
 
-        default_value = properties.get("default")
-        if default_value is not None:
-            for sub_type, sub_property in sub_types:
-                try:
-                    self.validate_default(sub_type, sub_property, default_value)
-                    break
-                except ValueError:
-                    continue
-            else:
-                raise ValueError(
-                    f"Invalid default value {default_value} for anyOf types: {sub_types}"
-                )
-
-            mapped_properties["default"] = default_value
-
         if not kwargs.get("required", False):
             mapped_properties["default"] = mapped_properties.get("default")
 
diff --git a/jambo/parser/array_type_parser.py b/jambo/parser/array_type_parser.py
index 612044e..c92de3d 100644
--- a/jambo/parser/array_type_parser.py
+++ b/jambo/parser/array_type_parser.py
@@ -1,7 +1,7 @@
 from jambo.parser._type_parser import GenericTypeParser
 from jambo.types.type_parser_options import TypeParserOptions
 
-from typing_extensions import TypeVar, Unpack
+from typing_extensions import Iterable, TypeVar, Unpack
 
 import copy
 
@@ -21,7 +21,9 @@ class ArrayTypeParser(GenericTypeParser):
         "minItems": "min_length",
     }
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
         item_properties = kwargs.copy()
         item_properties["required"] = True
         _item_type, _item_args = GenericTypeParser.type_from_properties(
@@ -33,21 +35,20 @@ class ArrayTypeParser(GenericTypeParser):
 
         mapped_properties = self.mappings_properties_builder(properties, **kwargs)
 
-        default_list = properties.pop("default", None)
-        if default_list is not None:
-            self.validate_default(
-                field_type,
-                mapped_properties,
-                default_list,
+        if "default" not in mapped_properties:
+            mapped_properties["default_factory"] = self._build_default_factory(
+                properties.get("default"), wrapper_type
             )
 
-            if wrapper_type is list:
-                mapped_properties["default_factory"] = lambda: copy.deepcopy(
-                    wrapper_type(default_list)
-                )
-            else:
-                mapped_properties["default_factory"] = lambda: wrapper_type(
-                    default_list
-                )
-
         return field_type, mapped_properties
+
+    def _build_default_factory(self, default_list, wrapper_type):
+        if default_list is None:
+            return lambda: None
+
+        if not isinstance(default_list, Iterable):
+            raise ValueError(
+                f"Default value for array must be an iterable, got {type(default_list)}"
+            )
+
+        return lambda: copy.deepcopy(wrapper_type(default_list))
diff --git a/jambo/parser/boolean_type_parser.py b/jambo/parser/boolean_type_parser.py
index b2fc1b0..ecb703a 100644
--- a/jambo/parser/boolean_type_parser.py
+++ b/jambo/parser/boolean_type_parser.py
@@ -13,7 +13,9 @@ class BooleanTypeParser(GenericTypeParser):
         "default": "default",
     }
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
         mapped_properties = self.mappings_properties_builder(properties, **kwargs)
 
         default_value = properties.get("default")
diff --git a/jambo/parser/float_type_parser.py b/jambo/parser/float_type_parser.py
index f682cf8..f4655c3 100644
--- a/jambo/parser/float_type_parser.py
+++ b/jambo/parser/float_type_parser.py
@@ -18,11 +18,7 @@ class FloatTypeParser(GenericTypeParser):
         "default": "default",
     }
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
-        mapped_properties = self.mappings_properties_builder(properties, **kwargs)
-
-        default_value = mapped_properties.get("default")
-        if default_value is not None:
-            self.validate_default(float, mapped_properties, default_value)
-
-        return float, mapped_properties
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
+        return float, self.mappings_properties_builder(properties, **kwargs)
diff --git a/jambo/parser/int_type_parser.py b/jambo/parser/int_type_parser.py
index e65ecda..161465b 100644
--- a/jambo/parser/int_type_parser.py
+++ b/jambo/parser/int_type_parser.py
@@ -18,11 +18,7 @@ class IntTypeParser(GenericTypeParser):
         "default": "default",
     }
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
-        mapped_properties = self.mappings_properties_builder(properties, **kwargs)
-
-        default_value = mapped_properties.get("default")
-        if default_value is not None:
-            self.validate_default(int, mapped_properties, default_value)
-
-        return int, mapped_properties
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
+        return int, self.mappings_properties_builder(properties, **kwargs)
diff --git a/jambo/parser/object_type_parser.py b/jambo/parser/object_type_parser.py
index 72546d9..456bc4d 100644
--- a/jambo/parser/object_type_parser.py
+++ b/jambo/parser/object_type_parser.py
@@ -11,7 +11,7 @@ class ObjectTypeParser(GenericTypeParser):
 
     json_schema_type = "type:object"
 
-    def from_properties(
+    def from_properties_impl(
         self, name: str, properties: dict[str, Any], **kwargs: Unpack[TypeParserOptions]
     ):
         type_parsing = self.to_model(
@@ -39,7 +39,7 @@ class ObjectTypeParser(GenericTypeParser):
         """
         Converts JSON Schema object properties to a Pydantic model.
         :param name: The name of the model.
-        :param properties: The properties of the JSON Schema object.
+        :param schema: The properties of the JSON Schema object.
         :param required_keys: List of required keys in the schema.
         :return: A Pydantic model class.
         """
diff --git a/jambo/parser/string_type_parser.py b/jambo/parser/string_type_parser.py
index fe4df68..1eb25b9 100644
--- a/jambo/parser/string_type_parser.py
+++ b/jambo/parser/string_type_parser.py
@@ -34,24 +34,22 @@ class StringTypeParser(GenericTypeParser):
         "hostname": r"^[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?)*$",
     }
 
-    def from_properties(self, name, properties, **kwargs: Unpack[TypeParserOptions]):
-        mapped_properties = self.mappings_properties_builder(properties, **kwargs)
+    def from_properties_impl(
+        self, name, properties, **kwargs: Unpack[TypeParserOptions]
+    ):
+        mapped_properties = self.mappings_properties_builder(
+            properties, **kwargs
+        )
 
         format_type = properties.get("format")
-        if format_type:
-            if format_type in self.format_type_mapping:
-                mapped_type = self.format_type_mapping[format_type]
-                if format_type in self.format_pattern_mapping:
-                    mapped_properties["pattern"] = self.format_pattern_mapping[
-                        format_type
-                    ]
-            else:
-                raise ValueError(f"Unsupported string format: {format_type}")
-        else:
-            mapped_type = str
+        if not format_type:
+            return str, mapped_properties
 
-        default_value = properties.get("default")
-        if default_value is not None:
-            self.validate_default(mapped_type, mapped_properties, default_value)
+        if format_type not in self.format_type_mapping:
+            raise ValueError(f"Unsupported string format: {format_type}")
+
+        mapped_type = self.format_type_mapping[format_type]
+        if format_type in self.format_pattern_mapping:
+            mapped_properties["pattern"] = self.format_pattern_mapping[format_type]
 
         return mapped_type, mapped_properties
diff --git a/tests/parser/test_array_type_parser.py b/tests/parser/test_array_type_parser.py
index c81c193..d27330f 100644
--- a/tests/parser/test_array_type_parser.py
+++ b/tests/parser/test_array_type_parser.py
@@ -73,7 +73,7 @@ class TestArrayTypeParser(TestCase):
     def test_array_parser_with_invalid_default_type(self):
         parser = ArrayTypeParser()
 
-        properties = {"items": {"type": "string"}, "default": "not_a_list"}
+        properties = {"items": {"type": "string"}, "default": 000}
 
         with self.assertRaises(ValueError):
             parser.from_properties("placeholder", properties)
diff --git a/tests/parser/test_bool_type_parser.py b/tests/parser/test_bool_type_parser.py
index f21b547..1e3a6c9 100644
--- a/tests/parser/test_bool_type_parser.py
+++ b/tests/parser/test_bool_type_parser.py
@@ -9,7 +9,9 @@ class TestBoolTypeParser(TestCase):
 
         properties = {"type": "boolean"}
 
-        type_parsing, type_validator = parser.from_properties("placeholder", properties)
+        type_parsing, type_validator = parser.from_properties_impl(
+            "placeholder", properties
+        )
 
         self.assertEqual(type_parsing, bool)
         self.assertEqual(type_validator, {"default": None})
@@ -22,7 +24,9 @@ class TestBoolTypeParser(TestCase):
             "default": True,
         }
 
-        type_parsing, type_validator = parser.from_properties("placeholder", properties)
+        type_parsing, type_validator = parser.from_properties_impl(
+            "placeholder", properties
+        )
 
         self.assertEqual(type_parsing, bool)
         self.assertEqual(type_validator["default"], True)
@@ -36,4 +40,4 @@ class TestBoolTypeParser(TestCase):
         }
 
         with self.assertRaises(ValueError):
-            parser.from_properties("placeholder", properties)
+            parser.from_properties_impl("placeholder", properties)
diff --git a/tests/parser/test_object_type_parser.py b/tests/parser/test_object_type_parser.py
index 6f56727..4adbc52 100644
--- a/tests/parser/test_object_type_parser.py
+++ b/tests/parser/test_object_type_parser.py
@@ -15,7 +15,7 @@ class TestObjectTypeParser(TestCase):
             },
         }
 
-        Model, _args = parser.from_properties("placeholder", properties)
+        Model, _args = parser.from_properties_impl("placeholder", properties)
 
         obj = Model(name="name", age=10)
 
@@ -37,7 +37,7 @@ class TestObjectTypeParser(TestCase):
             },
         }
 
-        _, type_validator = parser.from_properties("placeholder", properties)
+        _, type_validator = parser.from_properties_impl("placeholder", properties)
 
         # Check default value
         default_obj = type_validator["default_factory"]()
diff --git a/tests/parser/test_type_parser.py b/tests/parser/test_type_parser.py
index e26a3d5..1bf2687 100644
--- a/tests/parser/test_type_parser.py
+++ b/tests/parser/test_type_parser.py
@@ -11,7 +11,7 @@ def with_test_parser():
         mapped_type = str
         json_schema_type = "type:invalid"
 
-        def from_properties(
+        def from_properties_impl(
             self, name: str, properties: dict[str, any], required: bool = False
         ): ...
 
@@ -39,11 +39,3 @@ class TestGenericTypeParser(TestCase):
         ):
             InvalidGenericTypeParser.json_schema_type = None
             GenericTypeParser._get_impl({"type": "another_invalid_type"})
-
-    def test_invalid_mappings_properties_builder(self):
-        with (
-            with_test_parser() as InvalidGenericTypeParser,
-            self.assertRaises(NotImplementedError),
-        ):
-            parser = InvalidGenericTypeParser()
-            parser.mappings_properties_builder({}, required=False)
diff --git a/tests/test_schema_converter.py b/tests/test_schema_converter.py
index 22dbddd..7b10b0f 100644
--- a/tests/test_schema_converter.py
+++ b/tests/test_schema_converter.py
@@ -255,6 +255,7 @@ class TestSchemaConverter(TestCase):
 
         self.assertEqual(obj.name, "John")
 
+    def test_invalid_default_for_string(self):
         # Test for default with maxLength
         schema_max_length = {
             "title": "Person",