diff --git a/api/v1/index.js b/api/v1/index.js
index 528e7ce..6141628 100644
--- a/api/v1/index.js
+++ b/api/v1/index.js
@@ -48,12 +48,15 @@ router.get('/music', async (req, res) => {
 		res.send(Buffer.from([]));
 	});
 });
-
-// middleware (Обработка типа ответа)
+// middleware (Обработка ошибок типа ответа)
 router.use((req, res, next) => {
 	const unknownResponseFormat = "UNKNOWN_RESPONSE_FORMAT";
+	if (!res.result) {
+		return res.status(400).send(unknownResponseFormat);
+	}
+	next();
 	
-	if (!req.query.response_format) {
+	/*if (!req.query.response_format) {
 		res.send(unknownResponseFormat);
 	}
 	else if (req.query.response_format === 'json') {
@@ -68,7 +71,7 @@ router.use((req, res, next) => {
 	}
 	else {
 		res.send(unknownResponseFormat);
-	}
+	}*/
 });
 
 // Методы
diff --git a/server.js b/server.js
index f507802..d6c3311 100644
--- a/server.js
+++ b/server.js
@@ -14,14 +14,15 @@ app.use(bodyParser.json({limit: config().request_size_limit}));
 
 app.use(
 	(req, res, next) => {
-		// Поставил по-умолчанию
-		res.result = function (data, isErr = false, code = 200) {
-			this.status(code).json(!isErr ? {
-				response : data
-			} : {
-				error : data
-			});
-		};
+		if (req.query.response_format === 'json') {
+			res.result = function (data, isErr = false, code = 200) {
+				this.status(code).json(!isErr ? {
+					response : data
+				} : {
+					error : data
+				});
+			};
+		}
 		next();
 	}
 );