diff --git a/dargs/__main__.py b/dargs/__main__.py
new file mode 100644
index 0000000..f6a9c52
--- /dev/null
+++ b/dargs/__main__.py
@@ -0,0 +1,6 @@
+from __future__ import annotations
+
+from dargs.cli import main
+
+if __name__ == "__main__":
+    main()
diff --git a/dargs/_test.py b/dargs/_test.py
new file mode 100644
index 0000000..9378270
--- /dev/null
+++ b/dargs/_test.py
@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+from typing import List
+
+from dargs.dargs import Argument
+
+
+def test_arguments() -> list[Argument]:
+    """Returns a list of arguments."""
+    return [
+        Argument(name="test1", dtype=int, doc="Argument 1"),
+        Argument(name="test2", dtype=[float, None], doc="Argument 2"),
+        Argument(
+            name="test3",
+            dtype=List[str],
+            default=["test"],
+            optional=True,
+            doc="Argument 3",
+        ),
+    ]
+
+
+__all__ = [
+    "test_arguments",
+]
diff --git a/dargs/check.py b/dargs/check.py
new file mode 100644
index 0000000..2711927
--- /dev/null
+++ b/dargs/check.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+from dargs.dargs import Argument
+
+
+def check(
+    arginfo: Argument | list[Argument] | tuple[Argument, ...],
+    data: dict,
+    strict: bool = True,
+    trim_pattern: str = "_*",
+) -> dict:
+    """Check and normalize input data.
+
+    Parameters
+    ----------
+    arginfo : Union[Argument, List[Argument], Tuple[Argument, ...]]
+        Argument object
+    data : dict
+        data to check
+    strict : bool, optional
+        If True, raise an error if the key is not pre-defined, by default True
+    trim_pattern : str, optional
+        Pattern to trim the key, by default "_*"
+
+    Returns
+    -------
+    dict
+        normalized data
+    """
+    if isinstance(arginfo, (list, tuple)):
+        arginfo = Argument("base", dtype=dict, sub_fields=arginfo)
+
+    data = arginfo.normalize_value(data, trim_pattern=trim_pattern)
+    arginfo.check_value(data, strict=strict)
+    return data
diff --git a/dargs/cli.py b/dargs/cli.py
new file mode 100644
index 0000000..045e87b
--- /dev/null
+++ b/dargs/cli.py
@@ -0,0 +1,107 @@
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+from typing import IO
+
+from dargs._version import __version__
+from dargs.check import check
+
+
+def main_parser() -> argparse.ArgumentParser:
+    """Create the main parser for the command line interface.
+
+    Returns
+    -------
+    argparse.ArgumentParser
+        The main parser
+    """
+    parser = argparse.ArgumentParser(
+        description="dargs: Argument checking for Python programs"
+    )
+    subparsers = parser.add_subparsers(help="Sub-commands")
+    parser_check = subparsers.add_parser(
+        "check",
+        help="Check a JSON file against an Argument",
+        epilog="Example: dargs check -f dargs._test.test_arguments test_arguments.json",
+    )
+    parser_check.add_argument(
+        "-f",
+        "--func",
+        type=str,
+        help="Function that returns an Argument object. E.g., `dargs._test.test_arguments`",
+        required=True,
+    )
+    parser_check.add_argument(
+        "jdata",
+        type=argparse.FileType("r"),
+        default=[sys.stdin],
+        nargs="*",
+        help="Path to the JSON file. If not given, read from stdin.",
+    )
+    parser_check.add_argument(
+        "--no-strict",
+        action="store_false",
+        dest="strict",
+        help="Do not raise an error if the key is not pre-defined",
+    )
+    parser_check.add_argument(
+        "--trim-pattern",
+        type=str,
+        default="_*",
+        help="Pattern to trim the key",
+    )
+    parser_check.set_defaults(entrypoint=check_cli)
+
+    # --version
+    parser.add_argument("--version", action="version", version=__version__)
+    return parser
+
+
+def main():
+    """Main entry point for the command line interface."""
+    parser = main_parser()
+    args = parser.parse_args()
+
+    args.entrypoint(**vars(args))
+
+
+def check_cli(
+    *,
+    func: str,
+    jdata: list[IO],
+    strict: bool,
+    **kwargs,
+) -> None:
+    """Normalize and check input data.
+
+    Parameters
+    ----------
+    func : str
+        Function that returns an Argument object. E.g., `dargs._test.test_arguments`
+    jdata : IO
+        File object that contains the JSON data
+    strict : bool
+        If True, raise an error if the key is not pre-defined
+
+    Returns
+    -------
+    dict
+        normalized data
+    """
+    module_name, attr_name = func.rsplit(".", 1)
+    try:
+        mod = __import__(module_name, globals(), locals(), [attr_name])
+    except ImportError as e:
+        raise RuntimeError(
+            f'Failed to import "{attr_name}" from "{module_name}".\n{sys.exc_info()[1]}'
+        ) from e
+
+    if not hasattr(mod, attr_name):
+        raise RuntimeError(f'Module "{module_name}" has no attribute "{attr_name}"')
+    func_obj = getattr(mod, attr_name)
+    arginfo = func_obj()
+    for jj in jdata:
+        data = json.load(jj)
+        check(arginfo, data, strict=strict)
diff --git a/dargs/sphinx.py b/dargs/sphinx.py
index ac86f3e..8eb0b9e 100644
--- a/dargs/sphinx.py
+++ b/dargs/sphinx.py
@@ -57,10 +57,10 @@ def run(self):
 
         try:
             mod = __import__(module_name, globals(), locals(), [attr_name])
-        except ImportError:
+        except ImportError as e:
             raise self.error(
                 f'Failed to import "{attr_name}" from "{module_name}".\n{sys.exc_info()[1]}'
-            )
+            ) from e
 
         if not hasattr(mod, attr_name):
             raise self.error(
@@ -217,18 +217,3 @@ def _test_argument() -> Argument:
             ),
         ],
     )
-
-
-def _test_arguments() -> list[Argument]:
-    """Returns a list of arguments."""
-    return [
-        Argument(name="test1", dtype=int, doc="Argument 1"),
-        Argument(name="test2", dtype=[float, None], doc="Argument 2"),
-        Argument(
-            name="test3",
-            dtype=List[str],
-            default=["test"],
-            optional=True,
-            doc="Argument 3",
-        ),
-    ]
diff --git a/docs/cli.rst b/docs/cli.rst
new file mode 100644
index 0000000..dab9742
--- /dev/null
+++ b/docs/cli.rst
@@ -0,0 +1,9 @@
+.. _cli:
+
+Command line interface
+======================
+
+.. argparse::
+   :module: dargs.cli
+   :func: main_parser
+   :prog: dargs
diff --git a/docs/conf.py b/docs/conf.py
index 34270de..d3588bd 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -49,6 +49,7 @@
     "numpydoc",
     "myst_nb",
     "dargs.sphinx",
+    "sphinxarg.ext",
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/docs/index.rst b/docs/index.rst
index 83b72a3..cdf7bd9 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -11,6 +11,7 @@ Welcome to dargs's documentation!
    :caption: Contents:
 
    intro
+   cli
    sphinx
    dpgui
    nb
diff --git a/docs/requirements.txt b/docs/requirements.txt
index d2c7bc5..63c515c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,3 +3,4 @@ numpydoc
 deepmodeling_sphinx>=0.1.1
 myst-nb
 sphinx_rtd_theme
+sphinx-argparse
diff --git a/docs/sphinx.rst b/docs/sphinx.rst
index ee16d89..2521beb 100644
--- a/docs/sphinx.rst
+++ b/docs/sphinx.rst
@@ -15,20 +15,20 @@ Then `dargs` directive will be enabled:
 .. code-block:: rst
 
     .. dargs::
-       :module: dargs.sphinx
-       :func: _test_argument
+       :module: dargs._test
+       :func: test_argument
 
-where `_test_argument` returns an :class:`Argument <dargs.Argument>`. The documentation will be rendered as:
+where `test_argument` returns an :class:`Argument <dargs.Argument>`. The documentation will be rendered as:
 
 .. dargs::
-   :module: dargs.sphinx
-   :func: _test_argument
+   :module: dargs._test
+   :func: test_argument
 
 A :class:`list` of :class:`Argument <dargs.Argument>` is also accepted.
 
 .. dargs::
-   :module: dargs.sphinx
-   :func: _test_arguments
+   :module: dargs._test
+   :func: test_arguments
 
 Cross-referencing Arguments
 ---------------------------
diff --git a/pyproject.toml b/pyproject.toml
index c4b0900..1370c44 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,9 @@ typecheck = [
     "ipython",
 ]
 
+[project.scripts]
+dargs = "dargs.cli:main"
+
 [tool.setuptools.packages.find]
 include = ["dargs*"]
 
@@ -54,6 +57,7 @@ select = [
     "RUF", # ruff
     "I", # isort
     "TCH", # flake8-type-checking
+    "B904", # raise-without-from-inside-except
 ]
 
 ignore = [
diff --git a/tests/test_arguments.json b/tests/test_arguments.json
new file mode 100644
index 0000000..a3291ee
--- /dev/null
+++ b/tests/test_arguments.json
@@ -0,0 +1,4 @@
+{
+    "test1": 1,
+    "test2": 2
+}
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..a3a76f0
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+import subprocess
+import sys
+import unittest
+from pathlib import Path
+
+this_directory = Path(__file__).parent
+
+
+class TestCli(unittest.TestCase):
+    def test_check(self):
+        subprocess.check_call(
+            [
+                "dargs",
+                "check",
+                "-f",
+                "dargs._test.test_arguments",
+                str(this_directory / "test_arguments.json"),
+                str(this_directory / "test_arguments.json"),
+            ]
+        )
+        subprocess.check_call(
+            [
+                sys.executable,
+                "-m",
+                "dargs",
+                "check",
+                "-f",
+                "dargs._test.test_arguments",
+                str(this_directory / "test_arguments.json"),
+                str(this_directory / "test_arguments.json"),
+            ]
+        )
+        with (this_directory / "test_arguments.json").open() as f:
+            subprocess.check_call(
+                [
+                    "dargs",
+                    "check",
+                    "-f",
+                    "dargs._test.test_arguments",
+                ],
+                stdin=f,
+            )