diff --git a/apps/assets/api/node.py b/apps/assets/api/node.py
index 51e830efc..f772a2ace 100644
--- a/apps/assets/api/node.py
+++ b/apps/assets/api/node.py
@@ -39,6 +39,8 @@ __all__ = [
 
 
 class NodeViewSet(viewsets.ModelViewSet):
+    filter_fields = ('value', 'key', )
+    search_fields = filter_fields
     queryset = Node.objects.all()
     permission_classes = (IsOrgAdmin,)
     serializer_class = serializers.NodeSerializer
diff --git a/apps/assets/backends/external/db.py b/apps/assets/backends/external/db.py
index f3f6c16d6..eedafd336 100644
--- a/apps/assets/backends/external/db.py
+++ b/apps/assets/backends/external/db.py
@@ -11,7 +11,7 @@ class AuthBookBackend(BaseBackend):
     @classmethod
     def filter(cls, username=None, asset=None, latest=True):
         queryset = AuthBook.objects.all()
-        if username:
+        if username is not None:
             queryset = queryset.filter(username=username)
         if asset:
             queryset = queryset.filter(asset=asset)
diff --git a/apps/assets/backends/internal/admin_user.py b/apps/assets/backends/internal/admin_user.py
index e67b41fc9..abd32b5ae 100644
--- a/apps/assets/backends/internal/admin_user.py
+++ b/apps/assets/backends/internal/admin_user.py
@@ -27,7 +27,7 @@ class AdminUserBackend(BaseBackend):
         instances = []
         assets = cls._get_assets(asset)
         for asset in assets:
-            if username and asset.admin_user.username != username:
+            if username is not None and asset.admin_user.username != username:
                 continue
             instance = construct_authbook_object(asset.admin_user, asset)
             instances.append(instance)
diff --git a/apps/assets/backends/internal/system_user.py b/apps/assets/backends/internal/system_user.py
index 52b22215c..b1413fedb 100644
--- a/apps/assets/backends/internal/system_user.py
+++ b/apps/assets/backends/internal/system_user.py
@@ -30,7 +30,7 @@ class SystemUserBackend(BaseBackend):
     @classmethod
     def _filter_system_users_by_username(cls, system_users, username):
         _system_users = cls._distinct_system_users_by_username(system_users)
-        if username:
+        if username is not None:
             _system_users = [su for su in _system_users if username == su.username]
         return _system_users