Mock Data Extension is a free Google Chrome add-on designed for developers who need to simulate API responses during the testing and development phases. This tool intercepts specific fetch requests, allowing users to provide mocked data without the need for a live backend. With its user-friendly interface, developers can easily set, get, remove, and clear mocked endpoints along with their corresponding responses.

This extension utilizes Chrome's storage API to store mocked data locally, ensuring quick access and easy management. Additionally, it supports importing and exporting of mocked data in JSON format, making it convenient for developers to share or reuse configurations. Overall, Mock Data Extension serves as an essential tool for streamlining the development process by enabling efficient testing scenarios.