Mock Service Worker

Mock Service Worker (MSW) is a powerful and seamless library for intercepting and mocking REST and GraphQL API requests directly at the network level, in both browser and Node.js environments. Unlike traditional mocking libraries that patch client-side request utilities, MSW leverages the Service Worker API in browsers and a custom `http` interception module in Node.js. This approach allows applications to run against mock data without any code changes, making it ideal for consistent mocking across development, unit, integration, and end-to-end testing, as well as debugging. The current stable version is 2.13.4, with frequent minor and patch releases, often several times a month, indicating active development. Its key differentiator is providing deviation-free mocking by intercepting actual network requests, ensuring a high fidelity simulation of real API interactions.