diff --git a/various-tools/stage_param/reader.py b/various-tools/stage_param/reader.py
new file mode 100644
index 0000000..6215c2a
--- /dev/null
+++ b/various-tools/stage_param/reader.py
@@ -0,0 +1,62 @@
+import struct
+import json
+
+def read_string(f):
+    length = struct.unpack("B", f.read(1))[0]
+    return f.read(length).decode("utf-8")
+
+def read_int(f, size=2):
+    return int.from_bytes(f.read(size), byteorder="big")
+
+def read_list_of_ints(f):
+    levels = []
+    for _ in range(6):
+        levels.append(struct.unpack('B', f.read(1))[0])
+    return levels
+
+def read_hex_string(f, size):
+    return " ".join(f"{b:02X}" for b in f.read(size))
+
+def read_flag_list(f):
+    byte = f.read(1)[0]
+    return [(byte >> i) & 1 for i in range(7, -1, -1)]
+
+def parse_stage_param(file_path):
+    with open(file_path, "rb") as f:
+        num_elements = read_int(f, 2)
+        print(num_elements)
+        data = []
+        for _ in range(num_elements):
+            element = {
+                "name_ja": read_string(f),
+                "name_en": read_string(f),
+                "image_id": read_int(f),
+                "artist_ja": read_string(f),
+                "artist_en": read_string(f),
+                "length": read_string(f),
+                "difficulty": read_list_of_ints(f),
+                "bpm": read_string(f),
+                "sample_name": read_string(f),
+                "stage_id": read_string(f),
+                "dd": f.read(2).decode("utf-8"),
+                "ver": read_int(f, 1),
+                "easy_name": read_string(f),
+                "normal_name": read_string(f),
+                "hard_name": read_string(f),
+                "adlib_max_easy": read_int(f, 4),
+                "adlib_max_normal": read_int(f, 4),
+                "adlib_max_hard": read_int(f, 4),
+                "no_adlib_max_easy": read_int(f, 4),
+                "no_adlib_max_normal": read_int(f, 4),
+                "no_adlib_max_hard": read_int(f, 4),
+                "field_1": read_hex_string(f, 4),
+                "padding_1": read_hex_string(f, 11),
+                "flag_1": read_flag_list(f),
+                "padding_2": read_hex_string(f, 5)
+            }
+            data.append(element)
+
+    with open("stage_param.json", "w", encoding="utf-8") as f:
+        json.dump(data, f, indent=4, ensure_ascii=False)
+
+parse_stage_param("stage_param.dat")
\ No newline at end of file
diff --git a/various-tools/stage_param.dat b/various-tools/stage_param/stage_param.dat
similarity index 100%
rename from various-tools/stage_param.dat
rename to various-tools/stage_param/stage_param.dat
diff --git a/various-tools/stage_param_structure_wip.txt b/various-tools/stage_param/stage_param_structure_wip.txt
similarity index 100%
rename from various-tools/stage_param_structure_wip.txt
rename to various-tools/stage_param/stage_param_structure_wip.txt
diff --git a/various-tools/stage_param/writer.py b/various-tools/stage_param/writer.py
new file mode 100644
index 0000000..1c89100
--- /dev/null
+++ b/various-tools/stage_param/writer.py
@@ -0,0 +1,60 @@
+import json
+import struct
+
+def write_string(f, s):
+    data = s.encode("utf-8")
+    f.write(struct.pack("B", len(data)))
+    f.write(data)
+
+def write_int(f, value, size=2):
+    f.write(value.to_bytes(size, byteorder="big"))
+
+def write_list_of_ints(f, values):
+    f.write(bytes(values))
+
+def write_hex_string(f, hex_string):
+    f.write(bytes.fromhex(hex_string))
+
+def write_flag_list(f, flag_list):
+    byte_value = sum((bit << (7 - i)) for i, bit in enumerate(flag_list))
+    f.write(struct.pack("B", byte_value))
+
+def convert_json_to_dat(json_path, output_path):
+    with open(json_path, "r", encoding="utf-8") as f:
+        data = json.load(f)
+
+    with open(output_path, "wb") as f:
+        write_int(f, len(data), 2)
+
+        for element in data:
+            write_string(f, element["name_ja"])
+            write_string(f, element["name_en"])
+            write_int(f, element["image_id"], 2)
+            write_string(f, element["artist_ja"])
+            write_string(f, element["artist_en"])
+            write_string(f, element["length"])
+            write_list_of_ints(f, element["difficulty"])
+            write_string(f, element["bpm"])
+            write_string(f, element["sample_name"])
+            write_string(f, element["stage_id"])
+            
+            f.write(element["dd"].encode("utf-8"))
+
+            write_int(f, element["ver"], 1)
+            write_string(f, element["easy_name"])
+            write_string(f, element["normal_name"])
+            write_string(f, element["hard_name"])
+            
+            write_int(f, element["adlib_max_easy"], 4)
+            write_int(f, element["adlib_max_normal"], 4)
+            write_int(f, element["adlib_max_hard"], 4)
+            write_int(f, element["no_adlib_max_easy"], 4)
+            write_int(f, element["no_adlib_max_normal"], 4)
+            write_int(f, element["no_adlib_max_hard"], 4)
+
+            write_hex_string(f, element["field_1"])
+            write_hex_string(f, element["padding_1"])
+            write_flag_list(f, element["flag_1"])
+            write_hex_string(f, element["padding_2"])
+
+convert_json_to_dat("stage_param.json", "out_stage_param.dat")
\ No newline at end of file