diff --git a/apps/emqx_conf/src/emqx_conf.erl b/apps/emqx_conf/src/emqx_conf.erl
index 122998eeb..0bd319503 100644
--- a/apps/emqx_conf/src/emqx_conf.erl
+++ b/apps/emqx_conf/src/emqx_conf.erl
@@ -31,13 +31,6 @@
 -export([dump_schema/2, reformat_schema_dump/2]).
 -export([schema_module/0]).
 
-%% TODO: move to emqx_dashboard when we stop building api schema at build time
--export([
-    hotconf_schema_json/0,
-    bridge_schema_json/0,
-    hocon_schema_to_spec/2
-]).
-
 %% for rpc
 -export([get_node_and_config/1]).
 
@@ -456,17 +449,6 @@ warn_bad_namespace(Namespace) ->
             ok
     end.
 
-%% TODO: move this function to emqx_dashboard when we stop generating this JSON at build time.
-hotconf_schema_json() ->
-    SchemaInfo = #{title => <<"EMQX Hot Conf API Schema">>, version => <<"0.1.0">>},
-    gen_api_schema_json_iodata(emqx_mgmt_api_configs, SchemaInfo).
-
-%% TODO: move this function to emqx_dashboard when we stop generating this JSON at build time.
-bridge_schema_json() ->
-    Version = <<"0.1.0">>,
-    SchemaInfo = #{title => <<"EMQX Data Bridge API Schema">>, version => Version},
-    gen_api_schema_json_iodata(emqx_bridge_api, SchemaInfo).
-
 %% @doc return the root schema module.
 -spec schema_module() -> module().
 schema_module() ->
@@ -506,57 +488,6 @@ make_desc_resolver(Lang) ->
             unicode:characters_to_binary(Desc)
     end.
 
-gen_api_schema_json_iodata(SchemaMod, SchemaInfo) ->
-    emqx_dashboard_swagger:gen_api_schema_json_iodata(
-        SchemaMod,
-        SchemaInfo,
-        fun ?MODULE:hocon_schema_to_spec/2
-    ).
-
--define(TO_REF(_N_, _F_), iolist_to_binary([to_bin(_N_), ".", to_bin(_F_)])).
--define(TO_COMPONENTS_SCHEMA(_M_, _F_),
-    iolist_to_binary([
-        <<"#/components/schemas/">>,
-        ?TO_REF(emqx_dashboard_swagger:namespace(_M_), _F_)
-    ])
-).
-
-hocon_schema_to_spec(?R_REF(Module, StructName), _LocalModule) ->
-    {#{<<"$ref">> => ?TO_COMPONENTS_SCHEMA(Module, StructName)}, [{Module, StructName}]};
-hocon_schema_to_spec(?REF(StructName), LocalModule) ->
-    {#{<<"$ref">> => ?TO_COMPONENTS_SCHEMA(LocalModule, StructName)}, [{LocalModule, StructName}]};
-hocon_schema_to_spec(Type, LocalModule) when ?IS_TYPEREFL(Type) ->
-    {typename_to_spec(typerefl:name(Type), LocalModule), []};
-hocon_schema_to_spec(?ARRAY(Item), LocalModule) ->
-    {Schema, Refs} = hocon_schema_to_spec(Item, LocalModule),
-    {#{type => array, items => Schema}, Refs};
-hocon_schema_to_spec(?ENUM(Items), _LocalModule) ->
-    {#{type => enum, symbols => Items}, []};
-hocon_schema_to_spec(?MAP(Name, Type), LocalModule) ->
-    {Schema, SubRefs} = hocon_schema_to_spec(Type, LocalModule),
-    {
-        #{
-            <<"type">> => object,
-            <<"properties">> => #{<<"$", (to_bin(Name))/binary>> => Schema}
-        },
-        SubRefs
-    };
-hocon_schema_to_spec(?UNION(Types, _DisplayName), LocalModule) ->
-    {OneOf, Refs} = lists:foldl(
-        fun(Type, {Acc, RefsAcc}) ->
-            {Schema, SubRefs} = hocon_schema_to_spec(Type, LocalModule),
-            {[Schema | Acc], SubRefs ++ RefsAcc}
-        end,
-        {[], []},
-        hoconsc:union_members(Types)
-    ),
-    {#{<<"oneOf">> => OneOf}, Refs};
-hocon_schema_to_spec(Atom, _LocalModule) when is_atom(Atom) ->
-    {#{type => enum, symbols => [Atom]}, []}.
-
-typename_to_spec(TypeStr, Module) ->
-    emqx_conf_schema_types:readable_dashboard(Module, TypeStr).
-
 join_format(Snippets) ->
     case [S || S <- Snippets, S =/= undefined] of
         [] ->
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_schema_api.erl b/apps/emqx_dashboard/src/emqx_dashboard_schema_api.erl
index 9b5c45e71..41f516c7a 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_schema_api.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_schema_api.erl
@@ -33,6 +33,14 @@
 -define(TAGS, [<<"dashboard">>]).
 -define(BAD_REQUEST, 'BAD_REQUEST').
 
+-define(TO_REF(_N_, _F_), iolist_to_binary([to_bin(_N_), ".", to_bin(_F_)])).
+-define(TO_COMPONENTS_SCHEMA(_M_, _F_),
+    iolist_to_binary([
+        <<"#/components/schemas/">>,
+        ?TO_REF(emqx_dashboard_swagger:namespace(_M_), _F_)
+    ])
+).
+
 %%--------------------------------------------------------------------
 %% minirest API and schema
 %%--------------------------------------------------------------------
@@ -77,14 +85,22 @@ get_schema(get, _) ->
     {400, ?BAD_REQUEST, <<"unknown">>}.
 
 gen_schema(hotconf) ->
-    emqx_conf:hotconf_schema_json();
+    hotconf_schema_json();
 gen_schema(bridges) ->
-    emqx_conf:bridge_schema_json();
+    bridge_schema_json();
 gen_schema(actions) ->
     actions_schema_json();
 gen_schema(connectors) ->
     connectors_schema_json().
 
+hotconf_schema_json() ->
+    SchemaInfo = #{title => <<"EMQX Hot Conf API Schema">>, version => <<"0.1.0">>},
+    gen_api_schema_json_iodata(emqx_mgmt_api_configs, SchemaInfo).
+
+bridge_schema_json() ->
+    SchemaInfo = #{title => <<"EMQX Data Bridge API Schema">>, version => <<"0.1.0">>},
+    gen_api_schema_json_iodata(emqx_bridge_api, SchemaInfo).
+
 actions_schema_json() ->
     SchemaInfo = #{title => <<"EMQX Data Actions API Schema">>, version => <<"0.1.0">>},
     %% Note: this will be moved to `emqx_actions' application in the future.
@@ -98,5 +114,46 @@ gen_api_schema_json_iodata(SchemaMod, SchemaInfo) ->
     emqx_dashboard_swagger:gen_api_schema_json_iodata(
         SchemaMod,
         SchemaInfo,
-        fun emqx_conf:hocon_schema_to_spec/2
+        fun hocon_schema_to_spec/2
     ).
+
+hocon_schema_to_spec(?R_REF(Module, StructName), _LocalModule) ->
+    {#{<<"$ref">> => ?TO_COMPONENTS_SCHEMA(Module, StructName)}, [{Module, StructName}]};
+hocon_schema_to_spec(?REF(StructName), LocalModule) ->
+    {#{<<"$ref">> => ?TO_COMPONENTS_SCHEMA(LocalModule, StructName)}, [{LocalModule, StructName}]};
+hocon_schema_to_spec(Type, LocalModule) when ?IS_TYPEREFL(Type) ->
+    {typename_to_spec(typerefl:name(Type), LocalModule), []};
+hocon_schema_to_spec(?ARRAY(Item), LocalModule) ->
+    {Schema, Refs} = hocon_schema_to_spec(Item, LocalModule),
+    {#{type => array, items => Schema}, Refs};
+hocon_schema_to_spec(?ENUM(Items), _LocalModule) ->
+    {#{type => enum, symbols => Items}, []};
+hocon_schema_to_spec(?MAP(Name, Type), LocalModule) ->
+    {Schema, SubRefs} = hocon_schema_to_spec(Type, LocalModule),
+    {
+        #{
+            <<"type">> => object,
+            <<"properties">> => #{<<"$", (to_bin(Name))/binary>> => Schema}
+        },
+        SubRefs
+    };
+hocon_schema_to_spec(?UNION(Types, _DisplayName), LocalModule) ->
+    {OneOf, Refs} = lists:foldl(
+        fun(Type, {Acc, RefsAcc}) ->
+            {Schema, SubRefs} = hocon_schema_to_spec(Type, LocalModule),
+            {[Schema | Acc], SubRefs ++ RefsAcc}
+        end,
+        {[], []},
+        hoconsc:union_members(Types)
+    ),
+    {#{<<"oneOf">> => OneOf}, Refs};
+hocon_schema_to_spec(Atom, _LocalModule) when is_atom(Atom) ->
+    {#{type => enum, symbols => [Atom]}, []}.
+
+typename_to_spec(TypeStr, Module) ->
+    emqx_conf_schema_types:readable_dashboard(Module, TypeStr).
+
+to_bin(List) when is_list(List) -> iolist_to_binary(List);
+to_bin(Boolean) when is_boolean(Boolean) -> Boolean;
+to_bin(Atom) when is_atom(Atom) -> atom_to_binary(Atom, utf8);
+to_bin(X) -> X.