MockProxy is a Chrome add-on designed for developers who require robust HTTP request interception and local response simulation. This free tool allows users to seamlessly capture HTTP requests and redirect them to a local Node.js server, where responses can be configured using pre-defined JSON files. With the ability to define rules for various projects, domains, and requests, MockProxy enhances the efficiency of API testing and debugging processes.

Key features include configurable responses through a manifest.json file, dynamic status simulation for different HTTP responses, and customizable timeouts to replicate network conditions. The user-friendly popup interface allows for easy management of individual requests and projects, making it a valuable addition for developers seeking to streamline their workflow and improve testing accuracy.