cURL Runner is a free Chrome extension designed for developers, enabling them to execute cURL commands seamlessly from the browser's address bar or a popup interface. This tool simplifies the process of testing APIs by allowing users to view responses in various formats, such as HTML, JSON, images, or raw text, without the need for additional software like Postman or terminal applications.

Users can initiate cURL commands by typing 'curl' followed by a space in the address bar, or by utilizing the extension's popup UI for input. It's important to note that some browsers might require specific steps to activate the extension, and CORS errors may occur if the target API restricts browser-origin requests. cURL Runner is a practical solution for developers looking to streamline their workflow directly within Chrome.