diff --git a/esp8285/src/global.cpp b/esp8285/src/global.cpp
index e4e90db..b6627ef 100644
--- a/esp8285/src/global.cpp
+++ b/esp8285/src/global.cpp
@@ -25,8 +25,8 @@
 
 #include "global.h"
 
-StaticJsonDocument<512> http_request_doc;
-StaticJsonDocument<512> http_response_doc;
+StaticJsonDocument<1024> http_request_doc;
+StaticJsonDocument<1024> http_response_doc;
 
 // out solicited request message
 StaticJsonDocument<512> mqtt_upstream_topic_msg_doc;
diff --git a/esp8285/src/global.h b/esp8285/src/global.h
index 7239d24..94713db 100644
--- a/esp8285/src/global.h
+++ b/esp8285/src/global.h
@@ -29,8 +29,8 @@
 #include <WiFiClient.h>
 
 /* goable json variable */
-extern StaticJsonDocument<512> http_request_doc;
-extern StaticJsonDocument<512> http_response_doc;
+extern StaticJsonDocument<1024> http_request_doc;
+extern StaticJsonDocument<1024> http_response_doc;
 extern StaticJsonDocument<512> mqtt_upstream_topic_msg_doc;
 extern StaticJsonDocument<512> mqtt_upstream_topic_rsp_doc;
 extern StaticJsonDocument<512> mqtt_upstream_topic_ind_doc;