diff --git a/packages/backend/src/server/api/endpoints.ts b/packages/backend/src/server/api/endpoints.ts
index 3dfb7fdad4..c4ce52a16b 100644
--- a/packages/backend/src/server/api/endpoints.ts
+++ b/packages/backend/src/server/api/endpoints.ts
@@ -4,6 +4,7 @@
  */
 
 import { permissions } from 'misskey-js';
+import type { ApiErrorInput } from '@/server/api/error.js';
 import type { KeyOf, Schema } from '@/misc/json-schema.js';
 
 import * as ep___admin_abuseReport_notificationRecipient_list
@@ -780,11 +781,7 @@ interface IEndpointMetaBase {
 	readonly tags?: ReadonlyArray<string>;
 
 	readonly errors?: {
-		readonly [key: string]: {
-			readonly message: string;
-			readonly code: string;
-			readonly id: string;
-		};
+		readonly [key: string]: ApiErrorInput;
 	};
 
 	readonly res?: Schema;
diff --git a/packages/backend/src/server/api/error.ts b/packages/backend/src/server/api/error.ts
index 2f8322a568..60dfdccfd4 100644
--- a/packages/backend/src/server/api/error.ts
+++ b/packages/backend/src/server/api/error.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-type E = { message: string, code: string, id: string, kind?: 'client' | 'server' | 'permission', httpStatusCode?: number };
+export type ApiErrorInput = { message: string, code: string, id: string, kind?: 'client' | 'server' | 'permission', httpStatusCode?: number };
 
 export class ApiError extends Error {
 	public message: string;
@@ -13,7 +13,7 @@ export class ApiError extends Error {
 	public httpStatusCode?: number;
 	public info?: any;
 
-	constructor(err?: E | null | undefined, info?: any | null | undefined) {
+	constructor(err?: ApiErrorInput | null | undefined, info?: any | null | undefined) {
 		if (err == null) err = {
 			message: 'Internal error occurred. Please contact us if the error persists.',
 			code: 'INTERNAL_ERROR',