jakerella/jquery-mockjax

The industry standard for API mocking in JavaScript.

Mock http requests made using fetch

A tool for mocking HTTP services

Smocker is a simple and efficient HTTP mock server and proxy

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

HTTP server mocking and expectations library for Node.js

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.

Test spies, stubs and mocks for JavaScript.

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.