diff --git a/src/iflytop/core/core.hpp b/src/iflytop/core/core.hpp
index adfd4ed..86628c9 100644
--- a/src/iflytop/core/core.hpp
+++ b/src/iflytop/core/core.hpp
@@ -34,4 +34,8 @@
 #include "iflytop/core/utils/base64.hpp"
 #include "iflytop/core/utils/uuid/uuid.hpp"
 
-#define ZARRAYSIZE(a) (sizeof(a) / sizeof(a[0]))
\ No newline at end of file
+#define ZARRAYSIZE(a) (sizeof(a) / sizeof(a[0]))
+
+namespace iflytop {
+typedef nlohmann::json zjson;
+}
\ No newline at end of file