diff --git a/.gitignore b/.gitignore
index 36b13f1..b620425 100644
--- a/.gitignore
+++ b/.gitignore
@@ -86,7 +86,7 @@ ipython_config.py
 # pyenv
 #   For a library or package, you might want to ignore these files since the code is
 #   intended to run in multiple environments; otherwise, check them in:
-# .python-version
+.python-version
 
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
@@ -99,7 +99,7 @@ ipython_config.py
 #   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
 #   This is especially recommended for binary packages to ensure reproducibility, and is more
 #   commonly ignored for libraries.
-#uv.lock
+uv.lock
 
 # poetry
 #   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..754b0aa
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,19 @@
+[project]
+name = "primitive-type"
+version = "0.0.1"
+description = "Check a value or object if the type of it is primitive, or convert it to other primitive type in Python."
+readme = "README.md"
+license = { file = "LICENSE" }
+authors = [{ name = "CleMooling", email = "clemooling@staringplanet.top" }]
+keywords = ["type-checking", "primitive", "conversion"]
+classifiers = [
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  #    "Typing :: Typed",
+]
+requires-python = ">=3.12"
+dependencies = ["beartype>=0.22.9"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
diff --git a/src/primitive_type/__init__.py b/src/primitive_type/__init__.py
new file mode 100644
index 0000000..6bc3e53
--- /dev/null
+++ b/src/primitive_type/__init__.py
@@ -0,0 +1,21 @@
+"""Entrypoint of this package."""
+
+from primitive_type.types import Primitive, PrimitiveMap
+from primitive_type.checker import is_primitive, is_nested_dict
+from primitive_type.converter import get_primitive_object, ConvertError
+from importlib.metadata import version, PackageNotFoundError
+
+try:
+    __version__ = version("primitive-type")
+except PackageNotFoundError:
+    __version__ = "unknown"
+
+
+__all__ = [
+    "Primitive",
+    "PrimitiveMap",
+    "is_primitive",
+    "is_nested_dict",
+    "get_primitive_object",
+    "ConvertError",
+]
diff --git a/src/primitive_type/checker.py b/src/primitive_type/checker.py
new file mode 100644
index 0000000..dc232d9
--- /dev/null
+++ b/src/primitive_type/checker.py
@@ -0,0 +1,31 @@
+"""Utils for checking objects."""
+
+from beartype import beartype
+
+
+def is_primitive(val: object) -> bool:
+    """Check an object if it's a primitive object.
+
+    :param val: Any instance for checking.
+
+    :return:
+        * :obj:`True` -- If the object is primitive
+        * :obj:`False` -- Otherwise.
+    """
+    return isinstance(val, (str, int, float, bool)) or val is None
+
+
+@beartype
+def is_nested_dict(obj: dict) -> bool:
+    """Check a dict if it has nested structures.
+
+    :param obj: Any dict object for checking.
+
+    :return:
+        * :obj:`True` -- If the dict has nested structures.
+        * :obj:`False` -- Otherwise.
+    """
+    for k, v in obj.items():
+        if not is_primitive(v):
+            return True
+    return False
diff --git a/src/primitive_type/converter.py b/src/primitive_type/converter.py
new file mode 100644
index 0000000..0e447d3
--- /dev/null
+++ b/src/primitive_type/converter.py
@@ -0,0 +1,74 @@
+"""A quick and simple converter to convert the type of an object."""
+
+import re
+
+from beartype import beartype
+from primitive_type.types import Primitive
+
+
+class ConvertError(TypeError):
+    """An exception should happens when conversion failed."""
+
+    pass
+
+
+@beartype
+def get_primitive_object(val: Primitive, obj_type: type[Primitive] = None) -> Primitive:
+    """Get a primitive object from a given value.
+
+    :param val: The given value wants to be converted.
+    :param obj_type: The target type of object that finally converted out. Default to :obj:`None` as disabled.
+
+    :return:
+        * :class:`str` -- If given value is a normal string, or convert to if type specified.
+        * :class:`int` -- The origin object or convert to.
+        * :class:`float` -- The origin object or convert to.
+        * :class:`bool` -- The origin object or convert to.
+        * :obj:`None` -- Only when given value is :obj:`None`.
+    """
+    obj_type_required: bool = obj_type is not None
+
+    if val is None:
+        if obj_type_required:
+            raise TypeError("Given value is None, could not convert to other type!")
+        return None
+
+    if not obj_type_required:
+        if not isinstance(val, str):
+            return val
+
+        val_lower = val.lower()
+        if val_lower == "true":
+            return True
+        if val_lower == "false":
+            return False
+
+        if re.fullmatch(r"[+-]?\d+", val):
+            return int(val)
+
+        if re.fullmatch(r"[+-]?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?", val):
+            return float(val)
+
+        return val
+
+    try:
+        if obj_type is str:
+            return str(val)
+
+        if obj_type is bool:
+            if isinstance(val, str):
+                return val.lower() == "true"
+            if isinstance(val, (int, float)):
+                return val > 0
+            return bool(val)
+
+        if obj_type is int:
+            return int(float(val)) if isinstance(val, str) else int(val)
+
+        if obj_type is float:
+            return float(val)
+
+    except (ValueError, TypeError, SyntaxError):
+        raise ConvertError(f"Could not convert '{val}' to type '{obj_type}'.")
+
+    return val
diff --git a/src/primitive_type/py.typed b/src/primitive_type/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/src/primitive_type/types.py b/src/primitive_type/types.py
new file mode 100644
index 0000000..9ef9178
--- /dev/null
+++ b/src/primitive_type/types.py
@@ -0,0 +1,16 @@
+"""Type aliases for primitive types."""
+
+type Primitive = str | int | float | bool | None
+"""
+Type alias for primitive values.
+
+Including: :class:`str`, :class:`int`, :class:`float`, :class:`bool`, and :obj:`None`.
+"""
+
+type PrimitiveMap = dict[str, Primitive]
+"""Type alias for a mapping of string keys to primitive values.
+
+This dictionary represents a collection of metadata or attributes where each 
+value is guaranteed to be a :data:`Primitive` type, ensuring type safety 
+and ease of serialization.
+"""
diff --git a/tests/test_primitive_type_converter.py b/tests/test_primitive_type_converter.py
new file mode 100644
index 0000000..3483c6e
--- /dev/null
+++ b/tests/test_primitive_type_converter.py
@@ -0,0 +1,66 @@
+import unittest
+
+from primitive_type.converter import get_primitive_object, ConvertError
+
+
+class TestPrimitiveTypeConverter(unittest.TestCase):
+    # Assertion of conversion tests.
+
+    def test_auto_infer_bool(self):
+        """Test conversion of bool strings."""
+        self.assertEqual(get_primitive_object("true"), True)
+        self.assertEqual(get_primitive_object("FALSE"), False)
+        self.assertEqual(get_primitive_object("True"), True)
+
+    def test_auto_infer_int(self):
+        """Test conversion of integer number strings."""
+        self.assertEqual(get_primitive_object("123"), 123)
+        self.assertEqual(get_primitive_object("-456"), -456)
+
+    def test_auto_infer_float(self):
+        """Test conversion of float number strings."""
+        self.assertEqual(get_primitive_object("3.14"), 3.14)
+        self.assertEqual(get_primitive_object(".5"), 0.5)
+        self.assertEqual(get_primitive_object("1e-10"), 1e-10)
+
+    def test_auto_infer_none_and_others(self):
+        """Test assertion of conversion for `None` object or other."""
+        self.assertIsNone(get_primitive_object(None))
+        self.assertEqual(get_primitive_object("hello"), "hello")
+        self.assertEqual(get_primitive_object(100), 100)
+        self.assertEqual(get_primitive_object(3.14), 3.14)
+        self.assertEqual(get_primitive_object(True), True)
+
+    # Explicit conversion tests
+
+    def test_explicit_to_str(self):
+        """Test explicit convert a value to a `str` value."""
+        self.assertEqual(get_primitive_object(123, obj_type=str), "123")
+        self.assertEqual(get_primitive_object(True, obj_type=str), "True")
+
+    def test_explicit_to_int(self):
+        """Test explicit convert a value to a `int` value."""
+        self.assertEqual(get_primitive_object("123", obj_type=int), 123)
+        self.assertEqual(get_primitive_object(3.9, obj_type=int), 3)
+        # 你的实现中包含 int(float(val)) 逻辑，测试字符串带小数点的转换
+        self.assertEqual(get_primitive_object("12.3", obj_type=int), 12)
+
+    def test_explicit_to_bool(self):
+        """Test explicit convert a value to a `bool` value."""
+        self.assertEqual(get_primitive_object("true", obj_type=bool), True)
+        self.assertEqual(get_primitive_object(1, obj_type=bool), True)
+        self.assertEqual(get_primitive_object(0, obj_type=bool), False)
+
+    def test_convert_none_error(self):
+        """Test raise `TypeError` when wants to convert a `None` object into a value that is not None."""
+        with self.assertRaises(TypeError):
+            get_primitive_object(None, obj_type=int)
+
+    def test_convert_failure(self):
+        """Test raise `ConvertError` when conversion failed."""
+        with self.assertRaises(ConvertError):
+            get_primitive_object("abc", obj_type=float)
+
+
+if __name__ == "__main__":
+    unittest.main()