getsentry/responses

Automatically mock your HTTP interactions to simplify and speed up testing

Intercept any app, then call it from Python like a library

Mock http requests made using fetch

Smocker is a simple and efficient HTTP mock server and proxy

HTTP mocking for Golang

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.

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.

A library that allows you to easily mock out tests based on AWS infrastructure.

A powerful mock object library for Rust