JaSON is a simple and easy to use Chrome extension that functions as an HTTP client to send API requests and view formatted responses. It is ideal for testing and debugging JSON and XML APIs, as well as RESTful APIs, web services, and web applications. The extension supports various HTTP methods including GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. It also has a dark/light theme for customization, stores request history with full text search, and provides a formatted input/output experience. With JaSON, you can conveniently authenticate via your browser and automatically send cookies for authenticated requests.