diff --git a/index.js b/index.js
index 3a17391..88ccac8 100644
--- a/index.js
+++ b/index.js
@@ -75,15 +75,22 @@ app.use((req, res, next) => {
 app.use((err, req, res, next) => {
 	res.locals.message = err.message;
 	res.locals.error = process.env.NODE_ENV !== "production" ? err : {};
-
-	// 상태 코드가 있으면 사용, 없으면 500으로 설정
+  
 	const statusCode = err.status || status.INTERNAL_SERVER_ERROR;
+  
 	console.error("Error Stack:", err.stack);
 	console.error("Error Data:", err.data);
-	res
-		.status(statusCode)
-		.send(response(err.data || { message: "Internal Server Error" }));
-});
+  
+	// 응답은 response()로 포맷팅하되, statusCode는 숫자로 분리
+	const responseBody = response(err.data || {
+	  code: 'COMMON000',
+	  isSuccess: false,
+	  message: 'Internal Server Error',
+	  result: null,
+	});
+  
+	res.status(statusCode).json(responseBody); // ✅ send → json도 좋음
+  });
 
 //sample
 app.listen(app.get("port"), () => {
diff --git a/src/controllers/music.controller.js b/src/controllers/music.controller.js
index 9fc3b64..3d99bc4 100644
--- a/src/controllers/music.controller.js
+++ b/src/controllers/music.controller.js
@@ -30,19 +30,23 @@ export const insertMusicController=async(req,res,next)=>{
 // music info 불러오는 Controller
 export const musicInfoController = async (req, res, next) => {
     try {
-        const token = req.headers.authorization.split(' ')[1];;
-        console.log(token);
-        const decoded = jwt.decode(token);
-        console.log(decoded);
-        const userId = decoded.req.id;
-        const songId = req.params.id;
-        const musicInfo = await musicInfoService(userId, songId);
-        res.send(response(status.SUCCESS, musicInfo));
+      const token = req.headers.authorization?.split(' ')[1];
+      const decoded = jwt.decode(token);
+      const userId = decoded?.id;
+      const songId = req.params.id;
+  
+      if (!userId) throw new BaseError(status.UNAUTHORIZED);
+  
+      const musicInfo = await musicInfoService(userId, songId);
+      res.status(status.SUCCESS.status).json(response(status.SUCCESS, musicInfo));
+  
     } catch (error) {
-        console.error(error);
-        res.send(response(status.BAD_REQUEST, BaseError(status.BAD_REQUEST)));
+      console.error(error);
+  
+      const errStatus = error instanceof BaseError ? error.status : status.BAD_REQUEST.status;
+      res.status(errStatus).json(response(status.BAD_REQUEST));
     }
-};
+  };
 
 
 // music change-info(update) Controller