diff --git a/contrib/epee/include/net/http_server_handlers_map2.h b/contrib/epee/include/net/http_server_handlers_map2.h
index 92aaa9500..49bd5a8d1 100644
--- a/contrib/epee/include/net/http_server_handlers_map2.h
+++ b/contrib/epee/include/net/http_server_handlers_map2.h
@@ -72,7 +72,7 @@
       bool parse_res = epee::serialization::load_t_from_json(static_cast<command_type::request&>(req), query_info.m_body); \
       if (!parse_res) \
       { \
-         MERROR("Failed to parse json: \r\n" << query_info.m_body); \
+         MERROR("Failed to parse JSON request"); \
          response_info.m_response_code = 400; \
          response_info.m_response_comment = "Bad request"; \
          return true; \
diff --git a/contrib/epee/include/storages/portable_storage_from_json.h b/contrib/epee/include/storages/portable_storage_from_json.h
index 908e83024..d9df576e0 100644
--- a/contrib/epee/include/storages/portable_storage_from_json.h
+++ b/contrib/epee/include/storages/portable_storage_from_json.h
@@ -43,7 +43,7 @@ namespace epee
   {
     namespace json
     {
-#define CHECK_ISSPACE()  if(!epee::misc_utils::parse::isspace(*it)){ ASSERT_MES_AND_THROW("Wrong JSON character at: " << std::string(it, buf_end));}
+#define CHECK_ISSPACE()  if(!epee::misc_utils::parse::isspace(*it)){ ASSERT_MES_AND_THROW("Unexpected character in JSON data");}
 
       /*inline void parse_error()
       {
@@ -168,7 +168,7 @@ namespace epee
             {
               //sub section here
               typename t_storage::hsection new_sec = stg.open_section(name, current_section, true);
-              CHECK_AND_ASSERT_THROW_MES(new_sec, "Failed to insert new section in json: " << std::string(it, buf_end));
+              CHECK_AND_ASSERT_THROW_MES(new_sec, "Failed to insert new section in JSON data");
               run_handler(new_sec, it, buf_end, stg, recursion + 1);
               state = match_state_wonder_after_value;
             }else if(*it == '[')
@@ -403,7 +403,7 @@ namespace epee
         }
         catch(const std::exception& ex)
         {
-          MERROR("Failed to parse json, what: " << ex.what());
+          MERROR("Failed to parse json, what: " << misc_utils::parse::transform_to_escape_sequence(ex.what()));
           return false;
         }
         catch(...)
diff --git a/contrib/epee/src/parserse_base_utils.cpp b/contrib/epee/src/parserse_base_utils.cpp
index 7f7f2f208..171b4de7c 100644
--- a/contrib/epee/src/parserse_base_utils.cpp
+++ b/contrib/epee/src/parserse_base_utils.cpp
@@ -176,8 +176,7 @@ namespace misc_utils
               }
               break;
             default:
-              val.push_back(*it);
-              LOG_PRINT_L0("Unknown escape sequence :\"\\" << *it << "\"");
+              ASSERT_MES_AND_THROW("Invalid escape sequence in JSON string");
             }
             escape_mode = false;
           }else if(*it == '"')
@@ -187,13 +186,13 @@ namespace misc_utils
           }else if(*it == '\\')
           {
             escape_mode = true;
-          }          
+          }
           else
           {
             val.push_back(*it); 
           }
         }
-        ASSERT_MES_AND_THROW("Failed to match string in json entry: " << std::string(star_end_string, buf_end));
+        ASSERT_MES_AND_THROW("Unterminated JSON string");
       }
       void match_number2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val, bool& is_float_val, bool& is_signed_val)
       {
@@ -226,10 +225,10 @@ namespace misc_utils
               return;
             }
             else 
-              ASSERT_MES_AND_THROW("wrong number in json entry: " << std::string(star_end_string, buf_end));
+              ASSERT_MES_AND_THROW("Invalid number in JSON entry");
           }
         }
-        ASSERT_MES_AND_THROW("wrong number in json entry: " << std::string(star_end_string, buf_end));
+        ASSERT_MES_AND_THROW("Invalid number in JSON entry");
       }
       void match_word2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
       {
@@ -244,11 +243,11 @@ namespace misc_utils
             {
               star_end_string = --it;
               return;
-            }else 
-              ASSERT_MES_AND_THROW("failed to match word number in json entry: " << std::string(star_end_string, buf_end));
+            }else
+              ASSERT_MES_AND_THROW("Invalid word in JSON entry");
           }
         }
-        ASSERT_MES_AND_THROW("failed to match word number in json entry: " << std::string(star_end_string, buf_end));
+        ASSERT_MES_AND_THROW("Invalid word in JSON entry");
       }
   }
 }