1 files changed, 18 insertions, 2 deletions
diff --git a/plugins/API/Renderer/Json2.php b/plugins/API/Renderer/Json2.php
index bd27810fb8..23f6effe0b 100644
--- a/plugins/API/Renderer/Json2.php
+++ b/plugins/API/Renderer/Json2.php
@@ -11,8 +11,24 @@ namespace Piwik\Plugins\API\Renderer;
 use Piwik\Piwik;
 
 /**
- * Left here for Backward compatibility in Piwik 3.X+ for all users who correctly used format=json2 during Piwik 2.X
+ * Correct API output renderer for JSON. Includes bug fixes for bugs in the old JSON API
+ * format.
  */
 class Json2 extends Json
 {
-}
-\ No newline at end of file
+    public function renderArray($array)
+    {
+        $result = parent::renderArray($array);
+
+        // if $array is a simple associative array, remove the JSON root array that is added by renderDataTable
+        if (!empty($array)
+            && Piwik::isAssociativeArray($array)
+            && !Piwik::isMultiDimensionalArray($array)
+        ) {
+            $result = substr($result, 1, strlen($result) - 2);
+        }
+
+        return $result;
+    }
+}
+