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Core Viewpoint - Requestly is presented as a versatile API client tool that combines HTTP interception, request modification, interface testing, and data simulation, claiming to be permanently free and fully open-source [4][6][12]. Features Overview - Requestly offers a comprehensive set of capabilities for developers, including collection management, multi-environment variables, complete request history, a visual interface, and collaboration features [7]. - Unlike many cloud-dependent tools, Requestly prioritizes local storage, allowing users to manage collections, switch environments, and run scripts similarly to Postman, while also providing real-time interception and modification of requests and responses like Charles [8]. - Advanced capabilities such as dynamic simulation, delay injection, and script control enhance API debugging and frontend development [9]. User Interface and Functionality - The interface features a three-column layout with a collection tree on the left, request parameters in the middle, and response data on the right, with all data stored locally in Git-tracked JSON files [14]. - Users can seamlessly switch between multiple environments (development, testing, production) using a dropdown menu, supporting both global and collection-level variables [16][17]. - The tool allows for easy creation of new requests or batch imports from formats like cURL, Postman collections, and OpenAPI [20]. HTTP Interception and Mocking - Requestly includes an HTTP interceptor that captures and modifies any HTTPS requests and responses, enabling real-time monitoring and editing [28]. - Users can create local or cloud-based mock APIs that support REST and GraphQL, allowing frontend developers to work without waiting for backend services [30].