diff --git a/core/modules/rest/src/Plugin/views/style/Serializer.php b/core/modules/rest/src/Plugin/views/style/Serializer.php
index 4e7c373..fe98f8e 100644
--- a/core/modules/rest/src/Plugin/views/style/Serializer.php
+++ b/core/modules/rest/src/Plugin/views/style/Serializer.php
@@ -127,8 +127,7 @@ public function render() {
 
     // Get the content type configured in the display or fallback to the
     // default.
-    $default_content_type = empty($this->view->live_preview) ? $this->displayHandler->getContentType() : 'json';
-    $content_type = $this->options['formats'] ? reset($this->options['formats']) : $default_content_type;
+    $content_type = $this->options['formats'] ? reset($this->options['formats']) : $this->displayHandler->getContentType();
 
     return $this->serializer->serialize($rows, $content_type);
   }
diff --git a/core/modules/rest/src/Tests/Views/StyleSerializerTest.php b/core/modules/rest/src/Tests/Views/StyleSerializerTest.php
index 16775a8..3ab6f79 100644
--- a/core/modules/rest/src/Tests/Views/StyleSerializerTest.php
+++ b/core/modules/rest/src/Tests/Views/StyleSerializerTest.php
@@ -126,7 +126,7 @@ public function testSerializerResponses() {
   /**
    * Tests the response format configuration.
    */
-  public function testResponseFormatConfiguration() {
+  public function testReponseFormatConfiguration() {
     $this->drupalLogin($this->adminUser);
 
     $style_options = 'admin/structure/views/nojs/display/test_serializer_display_field/rest_export_1/style_options';