diff --git a/src/Format/ArrayFormat.php b/src/Format/ArrayFormat.php
index 6dc4a70..f995501 100644
--- a/src/Format/ArrayFormat.php
+++ b/src/Format/ArrayFormat.php
@@ -3,7 +3,6 @@
 namespace Kiri\Router\Format;
 
 use Kiri\Router\Constrict\Stream;
-use Kiri\Router\ContentType;
 use Psr\Http\Message\ResponseInterface;
 
 class ArrayFormat implements IFormat
@@ -16,9 +15,8 @@ class ArrayFormat implements IFormat
      */
     public function call($result): ResponseInterface
     {
-        $result = json_encode($result);
-
-        return \response()->withBody(new Stream(json_encode($result, JSON_UNESCAPED_UNICODE)));
+        $result = json_encode($result, JSON_UNESCAPED_UNICODE);
+        return \response()->withBody(new Stream($result));
     }
 
 
diff --git a/src/Format/MixedFormat.php b/src/Format/MixedFormat.php
index b141d9e..1d65d7a 100644
--- a/src/Format/MixedFormat.php
+++ b/src/Format/MixedFormat.php
@@ -22,7 +22,7 @@ class MixedFormat implements IFormat
         if (is_array($result)) {
             return \response()->withContentType(ContentType::JSON)->withBody(new Stream(json_encode($result, JSON_UNESCAPED_UNICODE)));
         } else {
-            return \response()->withBody(new Stream($result));
+            return \response()->withBody(new Stream((string)$result));
         }
     }