diff --git a/lib/http-mock.d.ts b/lib/http-mock.d.ts
index aee66ef..a2c3327 100644
--- a/lib/http-mock.d.ts
+++ b/lib/http-mock.d.ts
@@ -2,7 +2,7 @@ import { Request, Response, CookieOptions } from 'express';
 import { IncomingMessage, OutgoingMessage } from 'http';
 
 export type RequestType = IncomingMessage | globalThis.Request;
-export type ResponseType = OutgoingMessage | globalThis.Response;
+export type ResponseType<ResBody = any> = OutgoingMessage | globalThis.Response | Response<ResBody>;
 
 export type RequestMethod = 'CONNECT' | 'DELETE' | 'GET' | 'HEAD' | 'OPTIONS' | 'PATCH' | 'POST' | 'PUT' | 'TRACE';
 
@@ -170,7 +170,7 @@ export type MockResponse<T extends ResponseType> = T & {
     _isEndCalled: () => boolean;
     _getHeaders: () => HeaderWebAPI;
     _getData: () => any;
-    _getJSONData: () => any;
+    _getJSONData: () => T extends Response<infer ResBody> ? ResBody : any;
     _getBuffer: () => Buffer;
     _getLocals: () => any;
     _getStatusCode: () => number;
@@ -187,7 +187,9 @@ export type MockResponse<T extends ResponseType> = T & {
 
 export function createRequest<T extends RequestType = Request>(options?: RequestOptions): MockRequest<T>;
 
-export function createResponse<T extends ResponseType = Response>(options?: ResponseOptions): MockResponse<T>;
+export function createResponse<T extends ResponseType = Response>(
+    options?: ResponseOptions
+): MockResponse<T extends Response<infer ResBody> ? Response<ResBody> : T>;
 
 export interface Mocks<T1 extends RequestType, T2 extends ResponseType> {
     req: MockRequest<T1>;
@@ -197,4 +199,11 @@ export interface Mocks<T1 extends RequestType, T2 extends ResponseType> {
 export function createMocks<T1 extends RequestType = Request, T2 extends ResponseType = Response>(
     reqOptions?: RequestOptions,
     resOptions?: ResponseOptions
-): Mocks<T1, T2>;
+): Mocks<
+    T1,
+    T2 extends globalThis.Response
+        ? globalThis.Response
+        : T2 extends Response<infer ResBody>
+          ? Response<ResBody>
+          : Response
+>;
diff --git a/test/lib/http-mock.test-d.ts b/test/lib/http-mock.test-d.ts
index ef38293..0604628 100644
--- a/test/lib/http-mock.test-d.ts
+++ b/test/lib/http-mock.test-d.ts
@@ -26,6 +26,14 @@ expectNotType<MockResponse<ExpressResponse>>(createResponse<NodeResponse>());
 expectAssignable<NodeResponse>(createResponse<NodeResponse>());
 expectNotAssignable<ExpressResponse>(createResponse<NodeResponse>());
 
+expectType<MockResponse<ExpressResponse<{ message: number }>>>(createResponse<ExpressResponse<{ message: number }>>());
+expectNotType<MockResponse<NodeResponse>>(createResponse<ExpressResponse<{ message: number }>>());
+expectAssignable<NodeResponse>(createResponse<ExpressResponse<{ message: number }>>());
+
 expectType<Mocks<ExpressRequest, ExpressResponse>>(createMocks());
 // eslint-disable-next-line no-undef
 expectType<Mocks<globalThis.Request, globalThis.Response>>(createMocks<globalThis.Request, globalThis.Response>());
+
+expectType<Mocks<ExpressRequest, ExpressResponse<{ message: number }>>>(
+    createMocks<ExpressRequest, ExpressResponse<{ message: number }>>()
+);