diff --git a/src/endpoints_handlers/AuthRegistrationExecutor.h b/src/endpoints_handlers/AuthRegistrationExecutor.h
index 2bc2636..fc65224 100644
--- a/src/endpoints_handlers/AuthRegistrationExecutor.h
+++ b/src/endpoints_handlers/AuthRegistrationExecutor.h
@@ -30,9 +30,13 @@ public:
     using namespace boost;
     using namespace boost::json;
     using namespace boost::beast;
+    using namespace std::string_literals;
 
     auto body = req.body();
     value req_json;
+    value response_body;
+
+    response_body.emplace_object();
 
     try
     {
@@ -41,8 +45,9 @@ public:
     catch (const system::system_error& err)
     {
       http::response<ResponseType> res{http::status::bad_request, req.version()};
+      response_body.as_object().emplace("Result", "cannot deserialize json");
 
-      res.body() = "{ \"Result\": \"cannot deserialize json\"}";
+      res.body() = serialize(response_body);
       res.set(http::field::content_type, "application/json");
       res.content_length(res.body().size());
 
@@ -56,7 +61,12 @@ public:
     {
       http::response<ResponseType> res{http::status::unprocessable_entity, req.version()};
 
-      res.body() = "{ \"Result\": \"validations failed\"}";
+      response_body.as_object().emplace(
+        "Result",
+        "Validations failed. Login should have length from 3 to 50. Password from 5 characters length."
+        );
+
+      res.body() = serialize(response_body);
       res.set(http::field::content_type, "application/json");
       res.content_length(res.body().size());
 
@@ -67,7 +77,12 @@ public:
     {
       http::response<ResponseType> res{http::status::conflict, req.version()};
 
-      res.body() = "{ \"Result\": \"user with login " + login + " exists\" }";
+      response_body.as_object().emplace(
+        "Result",
+        "user with login "s + login + " exists"s
+        );
+
+      res.body() = serialize(response_body);
       res.set(http::field::content_type, "application/json");
       res.content_length(res.body().size());
 
@@ -83,7 +98,12 @@ public:
         http::status::created, req.version()
       };
 
-    res.body() = "{ \"Result\": \"ok\"}";
+    response_body.as_object().emplace(
+        "Result",
+        "OK.Created."
+        );
+
+    res.body() = serialize(response_body);
     res.set(http::field::content_type, "application/json");
     res.content_length(res.body().size());