diff --git a/frontend/modules/api/controllers/ApiController.php b/frontend/modules/api/controllers/ApiController.php
index 2d0e59e..81fd9f9 100644
--- a/frontend/modules/api/controllers/ApiController.php
+++ b/frontend/modules/api/controllers/ApiController.php
@@ -3,7 +3,11 @@
 namespace frontend\modules\api\controllers;
 
 use common\behaviors\GsCors;
+use yii\filters\auth\CompositeAuth;
+use yii\filters\auth\HttpBearerAuth;
+use yii\filters\ContentNegotiator;
 use yii\rest\Controller;
+use yii\web\Response;
 
 class ApiController extends Controller
 {
@@ -24,6 +28,18 @@ class ApiController extends Controller
                     ],
                 ]
             ],
+            'authenticator' => [
+                'class' => CompositeAuth::class,
+                'authMethods' => [
+                    HttpBearerAuth::class,
+                ],
+            ],
+            [
+                'class' => ContentNegotiator::className(),
+                'formats' => [
+                    'application/json' => Response::FORMAT_JSON,
+                ],
+            ],
         ];
     }
 
diff --git a/frontend/modules/api/controllers/DocumentController.php b/frontend/modules/api/controllers/DocumentController.php
index b0ebf4b..49e11bd 100644
--- a/frontend/modules/api/controllers/DocumentController.php
+++ b/frontend/modules/api/controllers/DocumentController.php
@@ -14,18 +14,8 @@ use yii\web\NotFoundHttpException;
 use yii\rest\Controller;
 use yii\web\ServerErrorHttpException;
 
-class DocumentController extends Controller
+class DocumentController extends ApiController
 {
-    public function behaviors(): array
-    {
-        $behaviors = parent::behaviors();
-
-        $behaviors['authenticator']['authMethods'] = [
-            HttpBearerAuth::className(),
-        ];
-
-        return $behaviors;
-    }
 
     public function verbs(): array
     {
diff --git a/frontend/modules/api/controllers/TemplateController.php b/frontend/modules/api/controllers/TemplateController.php
index db782c1..4f622ef 100644
--- a/frontend/modules/api/controllers/TemplateController.php
+++ b/frontend/modules/api/controllers/TemplateController.php
@@ -5,22 +5,14 @@ namespace frontend\modules\api\controllers;
 use common\models\Document;
 use common\models\Template;
 use Yii;
+use yii\filters\auth\CompositeAuth;
 use yii\filters\auth\HttpBearerAuth;
+use yii\filters\ContentNegotiator;
 use yii\web\NotFoundHttpException;
-use yii\rest\Controller;
+use yii\web\Response;
 
-class TemplateController extends Controller
+class TemplateController extends ApiController
 {
-    public function behaviors(): array
-    {
-        $behaviors = parent::behaviors();
-
-        $behaviors['authenticator']['authMethods'] = [
-            HttpBearerAuth::className(),
-        ];
-
-        return $behaviors;
-    }
 
     public function verbs(): array
     {
@@ -34,7 +26,7 @@ class TemplateController extends Controller
     {
         $template = Template::find()->asArray()->all();
 
-        if(empty($template)) {
+        if (empty($template)) {
             throw new NotFoundHttpException('Documents are not assigned');
         }
 
@@ -44,8 +36,7 @@ class TemplateController extends Controller
     public function actionGetTemplateFields(): array
     {
         $template_id = Yii::$app->request->get('template_id');
-        if(empty($template_id) or !is_numeric($template_id))
-        {
+        if (empty($template_id) or !is_numeric($template_id)) {
             throw new NotFoundHttpException('Incorrect template ID');
         }
 
@@ -55,7 +46,7 @@ class TemplateController extends Controller
             ->asArray()
             ->all();
 
-        if(empty($templates)) {
+        if (empty($templates)) {
             throw new NotFoundHttpException('Documents are not assigned');
         }