diff --git a/include/dnsproxy.h b/include/dnsproxy.h
index 484c347..877321d 100644
--- a/include/dnsproxy.h
+++ b/include/dnsproxy.h
@@ -19,4 +19,6 @@ void dnsproxy_add_primary(dnsproxy *info, char *server);
 void dnsproxy_add_fallback(dnsproxy *info, char *server);
 void dnsproxy_add_bootstrap(dnsproxy *info, char *server);
 
+void dnsproxy_gen_config(dnsproxy *info);
+
 #endif
diff --git a/src/cleardns.c b/src/cleardns.c
index 32a3264..6ed014d 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -45,8 +45,15 @@ int main(int argc, char *argv[]) { // ClearDNS server
     dnsproxy_add_fallback(domestic, "tls://223.6.6.6");
     dnsproxy_add_fallback(domestic, "tls://120.53.53.53");
 
+    domestic->verify = FALSE;
+//    domestic->parallel = FALSE;
+    domestic->optimistic = TRUE;
+//    domestic->cache = "0";
+
     dnsproxy_dump("Domestic", domestic);
 
+    dnsproxy_gen_config(domestic);
+
 //    int debug_mode = 0;
 //    fprintf(stderr, "[ClearDNS] Server start.\n");
 //    for (char **p = argv; p < argv + argc; ++p) {
diff --git a/src/dnsproxy.c b/src/dnsproxy.c
index fefcf2a..ab378ea 100644
--- a/src/dnsproxy.c
+++ b/src/dnsproxy.c
@@ -1,9 +1,12 @@
 #include <stdlib.h>
+#include <string.h>
 #include "dnsproxy.h"
 #include "logger.h"
 #include "common.h"
 #include "strList.h"
 
+#include "cJSON.h"
+
 dnsproxy* dnsproxy_init(int port) {
     dnsproxy *info = (dnsproxy*)malloc(sizeof(dnsproxy));
     info->port = port;
@@ -39,3 +42,44 @@ void dnsproxy_add_fallback(dnsproxy *info, char *server) {
 void dnsproxy_add_bootstrap(dnsproxy *info, char *server) {
     info->bootstrap = string_list_append(info->bootstrap, server);
 }
+
+void dnsproxy_gen_config(dnsproxy *info) {
+    cJSON *config = cJSON_CreateObject();
+    if (!info->verify) {
+        cJSON_AddTrueToObject(config, "insecure"); // insecure --(default)--> `false`
+    }
+    if (info->parallel) {
+        cJSON_AddTrueToObject(config, "all-servers");
+    }
+    if (strcmp(info->cache, "0") != 0) {
+        cJSON_AddTrueToObject(config, "cache");
+        cJSON_AddStringToObject(config, "cache-size", info->cache);
+    }
+    if (info->optimistic) {
+        cJSON_AddTrueToObject(config, "cache-optimistic");
+    }
+
+    cJSON *port = cJSON_CreateArray();
+    cJSON_AddItemToArray(port, cJSON_CreateNumber(info->port));
+    cJSON_AddItemToObject(config, "listen-ports", port);
+
+    cJSON *bootstrap = cJSON_CreateArray();
+    for (char **server = info->bootstrap; *server != NULL; ++server) {
+        cJSON_AddItemToArray(bootstrap, cJSON_CreateString(*server));
+    }
+    cJSON_AddItemToObject(config, "bootstrap", bootstrap);
+
+    cJSON *fallback = cJSON_CreateArray();
+    for (char **server = info->fallback; *server != NULL; ++server) {
+        cJSON_AddItemToArray(fallback, cJSON_CreateString(*server));
+    }
+    cJSON_AddItemToObject(config, "fallback", fallback);
+
+    cJSON *primary = cJSON_CreateArray();
+    for (char **server = info->primary; *server != NULL; ++server) {
+        cJSON_AddItemToArray(primary, cJSON_CreateString(*server));
+    }
+    cJSON_AddItemToObject(config, "upstream", primary);
+
+    log_info("\n%s", cJSON_Print(config));
+}
diff --git a/src/utils/CMakeLists.txt b/src/utils/CMakeLists.txt
index b82db9b..4fd3913 100644
--- a/src/utils/CMakeLists.txt
+++ b/src/utils/CMakeLists.txt
@@ -1,3 +1,3 @@
 cmake_minimum_required(VERSION 2.8.12)
 
-add_library(utils logger.c strList.c)
+add_library(utils logger.c strList.c cJSON.c)
diff --git a/src/utils/cJSON.c b/src/utils/cJSON.c
index e40e4bb..3063f74 100644
--- a/src/utils/cJSON.c
+++ b/src/utils/cJSON.c
@@ -37,7 +37,7 @@
 #pragma warning (disable : 4001)
 #endif
 
-#include <strList.bak>
+#include <string.h>
 #include <stdio.h>
 #include <math.h>
 #include <stdlib.h>