diff --git a/src/_h5ai/client/js/inc/core/location.js b/src/_h5ai/client/js/inc/core/location.js
index b667ed31..865a2b2b 100644
--- a/src/_h5ai/client/js/inc/core/location.js
+++ b/src/_h5ai/client/js/inc/core/location.js
@@ -95,7 +95,7 @@ modulejs.define('core/location', ['_', 'modernizr', 'core/event', 'core/settings
 
                 _.each(json.items, function (jsonItem) {
 
-                    var e = Item.get(jsonItem.absHref, jsonItem.time, jsonItem.size, jsonItem.is_managed, jsonItem.content, jsonItem.md5, jsonItem.sha1);
+                    var e = Item.get(jsonItem.absHref, jsonItem.time, jsonItem.size, jsonItem.isManaged, jsonItem.content);
                     found[e.absHref] = true;
                 });
 
diff --git a/src/_h5ai/client/js/inc/ext/preview-img.js b/src/_h5ai/client/js/inc/ext/preview-img.js
index 5c23c77e..2992960f 100644
--- a/src/_h5ai/client/js/inc/ext/preview-img.js
+++ b/src/_h5ai/client/js/inc/ext/preview-img.js
@@ -27,7 +27,7 @@ modulejs.define('ext/preview-img', ['_', '$', 'core/event', 'core/server', 'core
             height: 0
         }, function (json) {
 
-            callback(json && json.code === 'RC_SUCCESS' ? json.absHref : null);
+            callback(json && json.absHref ? json.absHref : null);
         });
     }
 
diff --git a/src/_h5ai/client/js/inc/ext/thumbnails.js b/src/_h5ai/client/js/inc/ext/thumbnails.js
index 05a11010..99b35f65 100644
--- a/src/_h5ai/client/js/inc/ext/thumbnails.js
+++ b/src/_h5ai/client/js/inc/ext/thumbnails.js
@@ -21,7 +21,7 @@ modulejs.define('ext/thumbnails', ['_', 'core/event', 'core/server', 'core/setti
             height: settings.size
         }, function (json) {
 
-            callback(json && json.code === 'RC_SUCCESS' ? json.absHref : null);
+            callback(json && json.absHref ? json.absHref : null);
         });
     }
 
diff --git a/src/_h5ai/client/js/inc/model/item.js b/src/_h5ai/client/js/inc/model/item.js
index 093be356..4b073028 100644
--- a/src/_h5ai/client/js/inc/model/item.js
+++ b/src/_h5ai/client/js/inc/model/item.js
@@ -46,7 +46,7 @@ modulejs.define('model/item', ['_', 'core/event', 'core/location', 'core/server'
         }
     }
 
-    function getItem(absHref, time, size, isManaged, isContentFetched, md5, sha1) {
+    function getItem(absHref, time, size, isManaged, isContentFetched) {
 
         absHref = location.forceEncoding(absHref);
 
@@ -68,12 +68,6 @@ modulejs.define('model/item', ['_', 'core/event', 'core/location', 'core/server'
         if (isContentFetched) {
             self.isContentFetched = true;
         }
-        if (md5) {
-            self.md5 = md5;
-        }
-        if (sha1) {
-            self.sha1 = sha1;
-        }
 
         return self;
     }
@@ -111,7 +105,7 @@ modulejs.define('model/item', ['_', 'core/event', 'core/location', 'core/server'
 
                 if (response.items) {
                     _.each(response.items, function (item) {
-                        getItem(item.absHref, item.time, item.size, item.is_managed, item.content, item.md5, item.sha1);
+                        getItem(item.absHref, item.time, item.size, item.isManaged, item.content);
                     });
                 }
 
diff --git a/src/_h5ai/server/php/inc/class-api.php b/src/_h5ai/server/php/inc/class-api.php
index af1d8301..f89dd267 100644
--- a/src/_h5ai/server/php/inc/class-api.php
+++ b/src/_h5ai/server/php/inc/class-api.php
@@ -15,7 +15,7 @@ class Api {
 
         $action = Util::get_request_param("action");
         $supported = array("login", "logout", "get", "getThumbHref", "download");
-        Util::json_fail(Util::RC_UNSUPPORTED, "unsupported action", !in_array($action, $supported));
+        Util::json_fail(Util::ERR_UNSUPPORTED, "unsupported action", !in_array($action, $supported));
 
         $methodname = "on_${action}";
         $this->$methodname();
@@ -26,14 +26,14 @@ class Api {
 
         $pass = Util::get_request_param("pass");
         $_SESSION[AS_ADMIN_SESSION_KEY] = sha1($pass) === PASSHASH;
-        Util::json_exit(array("as_admin" => $_SESSION[AS_ADMIN_SESSION_KEY]));
+        Util::json_exit(array("asAdmin" => $_SESSION[AS_ADMIN_SESSION_KEY]));
     }
 
 
     private function on_logout() {
 
         $_SESSION[AS_ADMIN_SESSION_KEY] = false;
-        Util::json_exit(array("as_admin" => $_SESSION[AS_ADMIN_SESSION_KEY]));
+        Util::json_exit(array("asAdmin" => $_SESSION[AS_ADMIN_SESSION_KEY]));
     }
 
 
@@ -76,8 +76,8 @@ class Api {
 
     private function on_getThumbHref() {
 
-        Util::json_fail(Util::RC_DISABLED, "thumbnails disabled", !$this->app->get_option("thumbnails.enabled", false));
-        Util::json_fail(Util::RC_UNSUPPORTED, "thumbnails not supported", !HAS_PHP_JPEG);
+        Util::json_fail(Util::ERR_DISABLED, "thumbnails disabled", !$this->app->get_option("thumbnails.enabled", false));
+        Util::json_fail(Util::ERR_UNSUPPORTED, "thumbnails not supported", !HAS_PHP_JPEG);
 
         $type = Util::get_request_param("type");
         $src_url = Util::get_request_param("href");
@@ -86,7 +86,7 @@ class Api {
 
         $thumb = new Thumb($this->app);
         $thumb_url = $thumb->thumb($type, $src_url, $width, $height);
-        Util::json_fail(Util::RC_FAILED, "thumbnail creation failed", $thumb_url === null);
+        Util::json_fail(Util::ERR_FAILED, "thumbnail creation failed", $thumb_url === null);
 
         Util::json_exit(array("absHref" => $thumb_url));
     }
@@ -94,7 +94,7 @@ class Api {
 
     private function on_download() {
 
-        Util::json_fail(Util::RC_DISABLED, "downloads disabled", !$this->app->get_option("download.enabled", false));
+        Util::json_fail(Util::ERR_DISABLED, "downloads disabled", !$this->app->get_option("download.enabled", false));
 
         $as = Util::get_request_param("as");
         $type = Util::get_request_param("type");
@@ -110,7 +110,7 @@ class Api {
         header("Connection: close");
         $rc = $archive->output($type, $hrefs);
 
-        Util::json_fail(Util::RC_FAILED, "packaging failed", $rc !== 0);
+        Util::json_fail(Util::ERR_FAILED, "packaging failed", $rc !== 0);
         exit;
     }
 }
diff --git a/src/_h5ai/server/php/inc/class-item.php b/src/_h5ai/server/php/inc/class-item.php
index 6c251aec..873d8ab0 100644
--- a/src/_h5ai/server/php/inc/class-item.php
+++ b/src/_h5ai/server/php/inc/class-item.php
@@ -37,7 +37,6 @@ class Item {
     public $app;
     public $path, $url, $date, $size;
     public $is_folder, $is_content_fetched;
-    public $md5, $sha1;
 
 
     private function __construct($app, $path) {
@@ -62,11 +61,8 @@ class Item {
         );
 
         if ($this->is_folder) {
-            $obj["is_managed"] = $this->app->is_managed_url($this->url);
+            $obj["isManaged"] = $this->app->is_managed_url($this->url);
             $obj["content"] = $this->is_content_fetched;
-        } else {
-            $obj["md5"] = $this->md5;
-            $obj["sha1"] = $this->sha1;
         }
 
         return $obj;
diff --git a/src/_h5ai/server/php/inc/class-util.php b/src/_h5ai/server/php/inc/class-util.php
index 2c8a180f..f7fe3a41 100644
--- a/src/_h5ai/server/php/inc/class-util.php
+++ b/src/_h5ai/server/php/inc/class-util.php
@@ -3,11 +3,10 @@
 class Util {
 
 
-    const RC_SUCCESS = "RC_SUCCESS";
-    const RC_MISSING_PARAM = "RC_MISSING_PARAM";
-    const RC_FAILED = "RC_FAILED";
-    const RC_DISABLED = "RC_DISABLED";
-    const RC_UNSUPPORTED = "RC_UNSUPPORTED";
+    const ERR_MISSING_PARAM = "ERR_MISSING_PARAM";
+    const ERR_FAILED = "ERR_FAILED";
+    const ERR_DISABLED = "ERR_DISABLED";
+    const ERR_UNSUPPORTED = "ERR_UNSUPPORTED";
 
 
     public static function normalize_path($path, $trailing_slash = false) {
@@ -19,20 +18,16 @@ class Util {
 
     public static function json_exit($obj = array()) {
 
-        if (!isset($obj["code"])) {
-            $obj["code"] = Util::RC_SUCCESS;
-        }
-
         header("Content-type: application/json;charset=utf-8");
         echo json_encode($obj);
         exit;
     }
 
 
-    public static function json_fail($code, $msg = "", $cond = true) {
+    public static function json_fail($err, $msg = "", $cond = true) {
 
         if ($cond) {
-            Util::json_exit(array("code" => $code, "msg" => $msg));
+            Util::json_exit(array("err" => $err, "msg" => $msg));
         }
     }
 
@@ -46,7 +41,7 @@ class Util {
     public static function get_request_param($key, $default = null) {
 
         if (!array_key_exists($key, $_POST)) {
-            Util::json_fail(Util::RC_MISSING_PARAM, "parameter '$key' is missing", $default === null);
+            Util::json_fail(Util::ERR_MISSING_PARAM, "parameter '$key' is missing", $default === null);
             return $default;
         }