diff --git a/apps/emqx_bridge/src/emqx_bridge_api.erl b/apps/emqx_bridge/src/emqx_bridge_api.erl
index 76fae732a..33eda4f4d 100644
--- a/apps/emqx_bridge/src/emqx_bridge_api.erl
+++ b/apps/emqx_bridge/src/emqx_bridge_api.erl
@@ -696,9 +696,20 @@ filter_out_request_body(Conf) ->
 
 error_msg(Code, Msg) when is_binary(Msg) ->
     #{code => Code, message => Msg};
+error_msg(Code, {_, HoconErrors = [{Type, _} | _]}) when
+    Type == translation_error orelse Type == validation_error
+->
+    MessageFormat = [hocon_error(HoconError) || HoconError <- HoconErrors],
+    #{code => Code, message => bin(MessageFormat)};
 error_msg(Code, Msg) ->
     #{code => Code, message => bin(io_lib:format("~p", [Msg]))}.
 
+hocon_error({Type, Message0}) when
+    Type == translation_error orelse Type == validation_error
+->
+    Message = maps:without([stacktrace], Message0),
+    emqx_logger_jsonfmt:best_effort_json(Message#{<<"type">> => Type}, []).
+
 bin(S) when is_list(S) ->
     list_to_binary(S);
 bin(S) when is_atom(S) ->
diff --git a/apps/emqx_connector/src/emqx_connector_api.erl b/apps/emqx_connector/src/emqx_connector_api.erl
index 8fb4f596d..5299257be 100644
--- a/apps/emqx_connector/src/emqx_connector_api.erl
+++ b/apps/emqx_connector/src/emqx_connector_api.erl
@@ -310,9 +310,20 @@ schema("/connectors/:id") ->
 
 error_msg(Code, Msg) when is_binary(Msg) ->
     #{code => Code, message => Msg};
+error_msg(Code, {_, HoconErrors = [{Type, _} | _]}) when
+    Type == translation_error orelse Type == validation_error
+->
+    MessageFormat = [hocon_error(HoconError) || HoconError <- HoconErrors],
+    #{code => Code, message => bin(MessageFormat)};
 error_msg(Code, Msg) ->
     #{code => Code, message => bin(io_lib:format("~p", [Msg]))}.
 
+hocon_error({Type, Message0}) when
+    Type == translation_error orelse Type == validation_error
+->
+    Message = maps:without([stacktrace], Message0),
+    emqx_logger_jsonfmt:best_effort_json(Message#{<<"type">> => Type}, []).
+
 format_resp(#{<<"type">> := ConnType, <<"name">> := ConnName} = RawConf) ->
     NumOfBridges = length(
         emqx_bridge:list_bridges_by_connector(
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
index 6f24ea50a..e4e83452c 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
@@ -334,14 +334,27 @@ replace_sql_clrf(#{<<"sql">> := SQL} = Params) ->
 %% Internal functions
 %%------------------------------------------------------------------------------
 
-err_msg({_, [{validation_error, VMessage}]}) ->
-    Exp = maps:get(expected_data_type, VMessage),
-    Path = maps:get(path, VMessage),
-    ErrorArg = maps:get(got, VMessage),
-    list_to_binary(io_lib:format("Key ~p error, expect ~p , got ~p", [Path, Exp, ErrorArg]));
+err_msg({_, HoconErrors = [{Type, _} | _]}) when
+    Type == translation_error orelse Type == validation_error
+->
+    MessageFormat = [hocon_error(HoconError) || HoconError <- HoconErrors],
+    list_to_binary(MessageFormat);
 err_msg(Msg) ->
     list_to_binary(io_lib:format("~0p", [Msg])).
 
+hocon_error({Type, Message0}) when
+    Type == translation_error orelse Type == validation_error
+->
+    case maps:get(reason, Message0, undefined) of
+        undefined ->
+            Message = maps:without([stacktrace], Message0),
+            emqx_logger_jsonfmt:best_effort_json(Message#{<<"type">> => Type}, []);
+        Reason when is_binary(Reason) ->
+            Reason;
+        Reason ->
+            list_to_binary(io_lib:format("~0p", [Reason]))
+    end.
+
 format_rule_resp(Rules) when is_list(Rules) ->
     [format_rule_resp(R) || R <- Rules];
 format_rule_resp(#{
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
index fd4cb8e6e..eed257b27 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
@@ -28,7 +28,7 @@
     desc/1
 ]).
 
--export([validate_sql/1]).
+-export([validate_sql/1, validate_rule_name/1]).
 
 namespace() -> rule_engine.
 
@@ -180,10 +180,25 @@ rule_name() ->
                 desc => ?DESC("rules_name"),
                 default => "",
                 required => true,
-                example => "foo"
+                example => "foo",
+                validator => fun ?MODULE:validate_rule_name/1
             }
         )}.
 
+validate_rule_name(Name) ->
+    RE = "^[A-Za-z0-9]+[A-Za-z0-9-_]*$",
+    try re:run(Name, RE) of
+        {match, _} ->
+            ok;
+        _Nomatch ->
+            Reason = list_to_binary(io_lib:format("Bad rule name ~p, expect ~p", [Name, RE])),
+            {error, Reason}
+    catch
+        _:_ ->
+            Reason = list_to_binary(io_lib:format("Bad rule name ~p, expect ~p", [Name, RE])),
+            {error, Reason}
+    end.
+
 outputs() ->
     [
         binary(),