diff --git a/packages/backend/src/server/api/ApiServerService.ts b/packages/backend/src/server/api/ApiServerService.ts
index 60b5c396f..2a4bd054d 100644
--- a/packages/backend/src/server/api/ApiServerService.ts
+++ b/packages/backend/src/server/api/ApiServerService.ts
@@ -7,6 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import cors from '@fastify/cors';
 import multipart from '@fastify/multipart';
 import fastifyCookie from '@fastify/cookie';
+import fastifyFormbody from '@fastify/formbody';
 import { ModuleRef } from '@nestjs/core';
 import type { Config } from '@/config.js';
 import type { InstancesRepository, AccessTokensRepository } from '@/models/_.js';
@@ -63,6 +64,13 @@ export class ApiServerService {
 			done();
 		});
 
+		fastify.register(this.createMisskeyServer);
+		fastify.register(this.createMastodonServer);
+		done();
+	}
+
+	@bindThis
+	public createMisskeyServer(fastify: FastifyInstance, options: FastifyPluginOptions, done: (err?: Error) => void) {
 		for (const endpoint of endpoints) {
 			const ep = {
 				name: endpoint.name,
@@ -106,32 +114,6 @@ export class ApiServerService {
 			}
 		}
 
-		const createEndpoint = (endpoint: IMastodonEndpoint): IMastodonEndpoint & { exec: any } => ({
-			name: endpoint.name,
-			method: endpoint.method,
-			meta: endpoint.meta,
-			params: endpoint.params,
-			exec: this.moduleRef.get(`mep:${endpoint.method}:${endpoint.name}`, { strict: false }).exec,
-		});
-		const groupedMastodonEndpoints = Array.from(Map.groupBy(mastodonEndpoints.map(createEndpoint), endpoint => endpoint.name))
-			.map(([name, endpoints]) => ({ name, endpoints: new Map(endpoints.map(endpoint => [endpoint.method, endpoint])) }));
-		for (const { name, endpoints } of groupedMastodonEndpoints) {
-			fastify.all<{
-				Params: { endpoint: string; },
-				Body: Record<string, unknown>,
-				Querystring: Record<string, unknown>,
-			}>('/' + name, async (request, reply) => {
-				const ep = endpoints.get(request.method);
-				if (!ep) {
-					reply.code(405);
-					reply.send();
-					return;
-				}
-				await this.apiCallService.handleMastodonRequest(ep, request, reply);
-				return reply;
-			});
-		}
-
 		fastify.post<{
 			Body: {
 				username: string;
@@ -212,4 +194,39 @@ export class ApiServerService {
 
 		done();
 	}
+
+	@bindThis
+	public createMastodonServer(fastify: FastifyInstance, options: FastifyPluginOptions, done: (err?: Error) => void) {
+		fastify.register(fastifyFormbody);
+
+		const createEndpoint = (endpoint: IMastodonEndpoint): IMastodonEndpoint & { exec: any } => ({
+			name: endpoint.name,
+			method: endpoint.method,
+			meta: endpoint.meta,
+			params: endpoint.params,
+			exec: this.moduleRef.get(`mep:${endpoint.method}:${endpoint.name}`, { strict: false }).exec,
+		});
+
+		const groupedMastodonEndpoints = Array.from(Map.groupBy(mastodonEndpoints.map(createEndpoint), endpoint => endpoint.name))
+			.map(([name, endpoints]) => ({ name, endpoints: new Map(endpoints.map(endpoint => [endpoint.method, endpoint])) }));
+
+		for (const { name, endpoints } of groupedMastodonEndpoints) {
+			fastify.all<{
+				Params: { endpoint: string; },
+				Body: Record<string, unknown>,
+				Querystring: Record<string, unknown>,
+			}>('/' + name, async (request, reply) => {
+				const ep = endpoints.get(request.method);
+				if (!ep) {
+					reply.code(405);
+					reply.send();
+					return;
+				}
+				await this.apiCallService.handleMastodonRequest(ep, request, reply);
+				return reply;
+			});
+		}
+
+		done();
+	}
 }