Smart Mock is a Chrome extension designed for frontend developers to facilitate API testing without backend modifications. This tool allows users to intercept various types of requests such as fetch, XHR, WebSocket, and SSE, enabling them to simulate different scenarios like errors, slow networks, and conditional responses. It features real-time comparison of mock and live APIs, allowing developers to identify changes instantly. The extension is user-friendly with dark mode, keyboard shortcuts, and full navigation support, making it a practical addition to any developer's toolkit.

What sets Smart Mock apart is its lightweight nature and local operation, ensuring that all data remains on the user's device without any analytics or tracking. The core features are available for free, with options to export and import mocks, including the ability to convert real traffic into mocks from DevTools. It also supports exporting to MSW format for future code integration, making Smart Mock a versatile choice for developers looking to enhance their testing capabilities.