Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is built and used by Kong, the author of the open-source Kong Gateway.

Scriptable, multipurpose mock server. Run standalone mock servers, or embed mocks within your tests or CI/CD pipeline.

🐵 HTTP mock server, useful to stub services and simulate dynamic API responses, leveraging ASP.NET Core features, built-in fake data generation and pure C# scripting

NEI 接口管理平台 源代码

Manage and start the mock servers on your local platform easily

Connect middleware that creates mocks for REST APIs

The open-source, cross-platform API test and design tool.

Mockbin by Zuplo. Mock, Test, and View HTTP Requests and Responses

Simple and efficient HTTP and Webscoket mock server with specification in yaml, edn or OpenAPI

This Angular library contains several projects: forms, api-mock, contenteditable.

Dynamic API, S3 & Mail mocking for web, mobile & microservice development.

Intercept & mock http requests issued by XMLHttpRequest, fetch, nodejs https/http module, axios, jquery, superagent, ky, node-fetch, request, got or any other request libraries by intercepting XMLHttpRequest, fetch and nodejs native requests at low level.

Record & replay API responses for Playwright E2E tests — SSR proxy + browser HAR + WebSockets. Deterministic CI, no backend, no manual mocks.

Library to mock local data requests using Fetch or XHR

🔌 Simple library to manipulate HTTP requests/responses and capture network logs made by the browser using selenium tests without using any proxies

Open-Source HTTP Interceptor & Mocking Tool

Backend not ready? No problem. Helix is a zero-config AI mock server that generates realistic, dynamic data for any endpoint you hit.

CLI for the Imposter mock engine, a scriptable, multipurpose mock server.

A versatile Go tool for effortlessly generating mock HTTP APIs for all your needs.