diff --git a/src/toon_format/cli.py b/src/toon_format/cli.py
index 07efd06..f861f33 100644
--- a/src/toon_format/cli.py
+++ b/src/toon_format/cli.py
@@ -210,7 +210,7 @@ def decode_toon_to_json(
     options = DecodeOptions(indent=indent, strict=strict)
     data = decode(toon_text, options)
 
-    return json.dumps(data, indent=2, ensure_ascii=False)
+    return json.dumps(data, indent=indent, ensure_ascii=False)
 
 
 if __name__ == "__main__":
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 3499bf7..95b3aea 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -272,6 +272,18 @@ def test_no_strict_option(self, tmp_path):
                 result = main()
                 assert result == 0
 
+    def test_decode_indent_option_affects_output(self, tmp_path):
+        """Ensure --indent controls the JSON formatting."""
+        input_file = tmp_path / "input.toon"
+        input_file.write_text("outer:\n    inner: 1")
+
+        with patch("sys.stdout", new_callable=StringIO) as mock_stdout:
+            with patch("sys.argv", ["toon", str(input_file), "--decode", "--indent", "4"]):
+                result = main()
+                assert result == 0
+                output = mock_stdout.getvalue()
+                assert '    "inner": 1' in output
+
     def test_error_file_not_found(self):
         """Test error when input file doesn't exist."""
         with patch("sys.stderr", new_callable=StringIO) as mock_stderr: