API Pilot - FREE and Open Source API Interceptor, Mocker & Tester

Intercept, modify, & mock HTTP requests with ease. A free, open-source dev tool for API development, testing, and debugging.

Intercept, modify, and mock HTTP requests with ease. A powerful developer tool to streamline your API development and testing workflow. API Pilot is the ultimate browser extension for front-end developers, QA engineers, and API producers. It allows you to take full control of your browser's network traffic without needing complex proxy setups or external desktop applications. Key Features: - Intercept & Modify: Seamlessly intercept outgoing API requests and modify headers, query parameters, or payloads on the fly. - Dynamic Mocking: Create robust mock responses for your APIs. Temporarily override server responses to test edge cases, error states, or features still under development. - API Tester & History: Replay past requests, tweak parameters, and test endpoints directly from the integrated, persistent sidebar. - Environment Variables: Manage multiple environments (Local, Staging, Prod) and switch between them effortlessly. - Privacy First: All your mock data, history, and configuration are stored locally on your device. Whether you are debugging a tricky authentication flow or building a UI against an incomplete backend, API Pilot gives you the tools you need right inside your browser.