RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.

Voiden is a developer-first API client with local storage, Git-integrated, all based on markdown + offline support.

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

The Complete Continuous Testing Platform Any test. Any device. App quality without limits.

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.