diff --git a/src/to-json/to_json.h b/include/to_json.h
similarity index 100%
rename from src/to-json/to_json.h
rename to include/to_json.h
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 08534e5..afa07b3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -7,6 +7,8 @@ include_directories(${PROJECT_SOURCE_DIR}/include/bcrypt)
 include_directories(${PROJECT_SOURCE_DIR}/include/common)
 include_directories(${PROJECT_SOURCE_DIR}/include/loader)
 
+link_directories(${PROJECT_SOURCE_DIR}/src/to-json/target/release)
+
 add_subdirectory(utils)
 add_subdirectory(applet)
 add_subdirectory(bcrypt)
diff --git a/src/cleardns.c b/src/cleardns.c
index 3ad366a..6439ea1 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -114,9 +114,24 @@ void cleardns() { // cleardns service
     process_list_daemon(); // daemon all process
 }
 
+#include "json.h"
+
 int main(int argc, char *argv[]) {
-    init(argc, argv);
-    log_info("ClearDNS server start (%s)", VERSION);
-    cleardns();
+
+    char error_string[] = "\f233\a";
+    char yaml_string[] = "test: ok\narray:\n  - 123\n  - 234\n  - 345\n";
+
+    log_info("Test yaml content ->\n%s", yaml_string);
+    char *json_result = to_json(yaml_string);
+    log_info("Return json content -> %s", json_result);
+    free(json_result);
+
+    log_info("Test error content");
+    char *ret = to_json(error_string);
+    log_info("Return -> %s", ret);
+
+//    init(argc, argv);
+//    log_info("ClearDNS server start (%s)", VERSION);
+//    cleardns();
     return 0;
 }
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 2e7dff9..d74b0be 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -1,3 +1,4 @@
 cmake_minimum_required(VERSION 2.8.12)
 
 add_library(common json.c sundry.c system.c structure.c)
+target_link_libraries(common to_json)
diff --git a/src/common/json.c b/src/common/json.c
index 95f33e7..f9e6912 100644
--- a/src/common/json.c
+++ b/src/common/json.c
@@ -4,6 +4,7 @@
 #include "logger.h"
 #include "sundry.h"
 #include "system.h"
+#include "to_json.h"
 #include "constant.h"
 #include "structure.h"
 
@@ -17,26 +18,39 @@ uint8_t is_json_suffix(const char *file_name) { // whether file name end with `.
     return FALSE;
 }
 
-char* to_json(const char *file) { // convert JSON / TOML / YAML to json format (if failed -> return NULL)
-    char flag[9];
-    for (int i = 0; i < 8; ++i) { // generate 8-bits flag
-        flag[i] = (char)gen_rand_num(10);
-        flag[i] += 48;
-    }
-    flag[8] = '\0';
+char* to_json(const char *raw) { // convert JSON / TOML / YAML to json format (if failed -> return NULL)
+
+    const char *json_string = to_json_rust(raw); // convert to json format
 
-    char *output_file = string_join("/tmp/to-json-", flag);
-    char *to_json_cmd = string_load("toJSON %s > %s", file, output_file);
-    int to_json_ret = run_command(to_json_cmd);
-    free(to_json_cmd);
+    char *json_content = strdup(json_string); // load string into owner heap
 
-    char *json_content = NULL;
-    if (!to_json_ret) { // toJSON return zero code (convert fine)
-        json_content = read_file(output_file);
+    free_rust_string(json_string); // free rust string
+
+    if (strlen(json_content) == 0) { // empty string -> convert error
+        free(json_content);
+        return NULL;
     }
-    remove_file(output_file);
-    free(output_file);
     return json_content;
+
+//    char flag[9];
+//    for (int i = 0; i < 8; ++i) { // generate 8-bits flag
+//        flag[i] = (char)gen_rand_num(10);
+//        flag[i] += 48;
+//    }
+//    flag[8] = '\0';
+//
+//    char *output_file = string_join("/tmp/to-json-", flag);
+//    char *to_json_cmd = string_load("toJSON %s > %s", file, output_file);
+//    int to_json_ret = run_command(to_json_cmd);
+//    free(to_json_cmd);
+//
+//    char *json_content = NULL;
+//    if (!to_json_ret) { // toJSON return zero code (convert fine)
+//        json_content = read_file(output_file);
+//    }
+//    remove_file(output_file);
+//    free(output_file);
+//    return json_content;
 }
 
 cJSON* json_field_get(cJSON *entry, const char *key) { // fetch key from json map (create when key not exist)