diff --git a/backend/main.py b/backend/main.py
index 7f6879c..2992a1a 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -25,7 +25,7 @@ async def handler(socket: SocketT) -> None:
             match data['action']:
 
                 case 'list':  # list tracks in album
-                    await socket.send(response.ok_playlist(
+                    await socket.send(response.playlist(
                         await ydl_wrap.get_playlist_items(
                             ydls.get_ydl(data['site']),
                             data['url'],
@@ -38,7 +38,7 @@ async def handler(socket: SocketT) -> None:
                         data['url'],
                         data.get('items'),
                     )
-                    await socket.send(response.ok_downloaded(ret))
+                    await socket.send(response.dl_end(ret))
 
                 # TODO: cancellation
 
diff --git a/backend/response.py b/backend/response.py
index 47e0c4b..dc9f997 100644
--- a/backend/response.py
+++ b/backend/response.py
@@ -1,25 +1,29 @@
 import json
 import traceback
 
-OK = '{"ok":true}'
-
-def ok_playlist(items: list[str]) -> str:
+def playlist(items: list[str]) -> str:
     return json.dumps({
-        "ok": True,
+        "type": "items",
         "data": items,
     })
 
-def ok_downloaded(ret: int) -> str:
+def dl_progress(msg: str) -> str:
     return json.dumps({
-        "type": "downloaded",
+        "type": "dl_progress",
+        "data": msg,
+    })
+
+def dl_end(ret: int) -> str:
+    return json.dumps({
+        "type": "dl_end",
         "data": ret,
     })
 
 def error(ex: Exception) -> str:
     traceback.print_tb(ex.__traceback__)
     return json.dumps({
-        "ok": False,
-        "error": {
+        "type": "error",
+        "data": {
             "type": ex.__class__.__qualname__,
             "message": str(ex),
         }