diff --git a/apps/emqx_management/src/emqx_mgmt_api_plugins.erl b/apps/emqx_management/src/emqx_mgmt_api_plugins.erl
index fdfbd864a..ca0d3ac10 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_plugins.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_plugins.erl
@@ -180,6 +180,9 @@ schema("/plugins/:name/config") ->
             responses => #{
                 %% avro data, json encoded
                 200 => hoconsc:mk(binary()),
+                400 => emqx_dashboard_swagger:error_codes(
+                    ['BAD_CONFIG'], <<"Plugin Config Not Found">>
+                ),
                 404 => emqx_dashboard_swagger:error_codes(['NOT_FOUND'], <<"Plugin Not Found">>)
             }
         },
@@ -490,13 +493,13 @@ update_plugin(put, #{bindings := #{name := Name, action := Action}}) ->
 plugin_config(get, #{bindings := #{name := NameVsn}}) ->
     case emqx_plugins:describe(NameVsn) of
         {ok, _} ->
-            case emqx_plugins:get_config(NameVsn) of
-                {ok, AvroJson} ->
+            case emqx_plugins:get_config(NameVsn, ?CONFIG_FORMAT_MAP, ?plugin_conf_not_found) of
+                {ok, AvroJson} when is_map(AvroJson) ->
                     {200, #{<<"content-type">> => <<"'application/json'">>}, AvroJson};
-                {error, _} ->
+                {ok, ?plugin_conf_not_found} ->
                     {400, #{
                         code => 'BAD_CONFIG',
-                        message => <<"Failed to get plugin config">>
+                        message => <<"Plugin Config Not Found">>
                     }}
             end;
         _ ->
diff --git a/apps/emqx_plugins/src/emqx_plugins.erl b/apps/emqx_plugins/src/emqx_plugins.erl
index da5bca312..11ef113b0 100644
--- a/apps/emqx_plugins/src/emqx_plugins.erl
+++ b/apps/emqx_plugins/src/emqx_plugins.erl
@@ -305,30 +305,36 @@ ensure_stopped(NameVsn) ->
         end
     ).
 
-get_config(Name, Vsn, Options, Default) ->
-    get_config(make_name_vsn_string(Name, Vsn), Options, Default).
+get_config(Name, Vsn, Opt, Default) ->
+    get_config(make_name_vsn_string(Name, Vsn), Opt, Default).
 
 -spec get_config(name_vsn()) ->
-    {ok, plugin_config()}
+    {ok, plugin_config() | any()}
     | {error, term()}.
 get_config(NameVsn) ->
-    get_config(NameVsn, #{format => ?CONFIG_FORMAT_MAP}).
+    get_config(NameVsn, ?CONFIG_FORMAT_MAP, #{}).
 
--spec get_config(name_vsn(), Options :: map()) ->
-    {ok, avro_binary() | plugin_config()}
+-spec get_config(name_vsn(), ?CONFIG_FORMAT_MAP | ?CONFIG_FORMAT_AVRO) ->
+    {ok, avro_binary() | plugin_config() | any()}
     | {error, term()}.
-get_config(NameVsn, #{format := ?CONFIG_FORMAT_AVRO}) ->
+get_config(NameVsn, ?CONFIG_FORMAT_MAP) ->
+    get_config(NameVsn, ?CONFIG_FORMAT_MAP, #{});
+get_config(NameVsn, ?CONFIG_FORMAT_AVRO) ->
+    get_config_bin(NameVsn).
+
+%% Present default config value only in map format.
+-spec get_config(name_vsn(), ?CONFIG_FORMAT_MAP, any()) ->
+    {ok, plugin_config() | any()}
+    | {error, term()}.
+get_config(NameVsn, ?CONFIG_FORMAT_MAP, Default) ->
+    {ok, persistent_term:get(?PLUGIN_PERSIS_CONFIG_KEY(bin(NameVsn)), Default)}.
+
+get_config_bin(NameVsn) ->
     %% no default value when get raw binary config
     case read_plugin_avro(NameVsn) of
         {ok, _AvroJson} = Res -> Res;
         {error, _Reason} = Err -> Err
-    end;
-get_config(NameVsn, #{format := ?CONFIG_FORMAT_MAP} = Options) ->
-    get_config(NameVsn, Options, #{}).
-
-%% Present default config value only in map format.
-get_config(NameVsn, #{format := ?CONFIG_FORMAT_MAP}, Default) ->
-    {ok, persistent_term:get(?PLUGIN_PERSIS_CONFIG_KEY(bin(NameVsn)), Default)}.
+    end.
 
 %% @doc Update plugin's config.
 %% RPC call from Management API or CLI.
@@ -770,7 +776,7 @@ get_avro_config_from_any_node([], _NameVsn, Errors) ->
 get_avro_config_from_any_node([Node | T], NameVsn, Errors) ->
     case
         emqx_plugins_proto_v2:get_config(
-            Node, NameVsn, #{format => ?CONFIG_FORMAT_MAP}, ?plugin_conf_not_found, 5_000
+            Node, NameVsn, ?CONFIG_FORMAT_MAP, ?plugin_conf_not_found, 5_000
         )
     of
         {ok, _} = Res ->
diff --git a/apps/emqx_plugins/src/proto/emqx_plugins_proto_v2.erl b/apps/emqx_plugins/src/proto/emqx_plugins_proto_v2.erl
index 68b8090a3..0e933d351 100644
--- a/apps/emqx_plugins/src/proto/emqx_plugins_proto_v2.erl
+++ b/apps/emqx_plugins/src/proto/emqx_plugins_proto_v2.erl
@@ -24,6 +24,7 @@
     get_config/5
 ]).
 
+-include("emqx_plugins.hrl").
 -include_lib("emqx/include/bpapi.hrl").
 
 -type name_vsn() :: binary() | string().
@@ -31,10 +32,12 @@
 introduced_in() ->
     "5.7.0".
 
--spec get_tar(node(), name_vsn(), timeout()) -> {ok, binary()} | {error, any}.
+-spec get_tar(node(), name_vsn(), timeout()) -> {ok, binary()} | {error, any()}.
 get_tar(Node, NameVsn, Timeout) ->
     rpc:call(Node, emqx_plugins, get_tar, [NameVsn], Timeout).
 
--spec get_config(node(), name_vsn(), map(), any(), timeout()) -> {ok, any()} | {error, any()}.
-get_config(Node, NameVsn, Opts, Default, Timeout) ->
-    rpc:call(Node, emqx_plugins, get_config, [NameVsn, Opts, Default], Timeout).
+-spec get_config(
+    node(), name_vsn(), ?CONFIG_FORMAT_MAP, any(), timeout()
+) -> {ok, map() | any()} | {error, any()}.
+get_config(Node, NameVsn, Opt, Default, Timeout) ->
+    rpc:call(Node, emqx_plugins, get_config, [NameVsn, Opt, Default], Timeout).