GraphQL Mocker is a Chrome extension designed to streamline the testing process for frontend developers and QA engineers by allowing real-time interception and customization of GraphQL responses. This tool enables users to capture GraphQL requests seamlessly, edit them with an intuitive JSON editor, and mock any response without the need for backend modifications. Key features include the ability to add response delays, a global toggle for enabling or disabling mocking, and a separate editor window for managing complex responses, making it an essential tool for those working with GraphQL APIs.

The extension is particularly useful for testing edge cases, debugging production issues, and preparing demos or presentations. Users can navigate to any page with GraphQL requests, access the extension to view captured operations, and modify responses as needed. With a focus on privacy, all data remains local to the browser, ensuring no external data collection occurs. GraphQL Mocker is free to use and open-source, encouraging community contributions.