diff --git a/common/lib/capa/capa/responsetypes.py b/common/lib/capa/capa/responsetypes.py
index 0e14ac46c1..4d24fc6c23 100644
--- a/common/lib/capa/capa/responsetypes.py
+++ b/common/lib/capa/capa/responsetypes.py
@@ -412,7 +412,7 @@ class JavascriptResponse(LoncapaResponse):
                                         id=self.xml.get('id')):
 
             raw_param = param.get("value")
-            params[param.get("name")] = contextualize_text(raw_param, self.context)
+            params[param.get("name")] = json.loads(contextualize_text(raw_param, self.context))
         
         return params