diff --git a/src/_h5ai/client/js/inc/ext/custom.js b/src/_h5ai/client/js/inc/ext/custom.js
index ce61cb5a..e51a43c5 100644
--- a/src/_h5ai/client/js/inc/ext/custom.js
+++ b/src/_h5ai/client/js/inc/ext/custom.js
@@ -22,7 +22,7 @@ modulejs.define('ext/custom', ['_', '$', 'marked', 'core/event', 'core/server',
 
                 if (data.header) {
                     content = data.header;
-                    if (data.header_type === 'md') {
+                    if (data.headerType === 'md') {
                         content = marked(content);
                     }
                     $header.html(content).stop().slideDown(duration);
@@ -31,7 +31,7 @@ modulejs.define('ext/custom', ['_', '$', 'marked', 'core/event', 'core/server',
 
                 if (data.footer) {
                     content = data.footer;
-                    if (data.footer_type === 'md') {
+                    if (data.footerType === 'md') {
                         content = marked(content);
                     }
                     $footer.html(content).stop().slideDown(duration);
diff --git a/src/_h5ai/server/php/inc/class-app.php b/src/_h5ai/server/php/inc/class-app.php
index f96aa31a..d401b7ba 100644
--- a/src/_h5ai/server/php/inc/class-app.php
+++ b/src/_h5ai/server/php/inc/class-app.php
@@ -337,9 +337,9 @@ class App {
         if (!$this->get_option("custom.enabled", false)) {
             return array(
                 "header" => null,
-                "header_type" => null,
+                "headerType" => null,
                 "footer" => null,
-                "footer_type" => null
+                "footerType" => null
             );
         }
 
@@ -374,9 +374,9 @@ class App {
 
         return array(
             "header" => $header,
-            "header_type" => $header_type,
+            "headerType" => $header_type,
             "footer" => $footer,
-            "footer_type" => $footer_type
+            "footerType" => $footer_type
         );
     }
 }