node-request-interceptor

Low-level HTTP/HTTPS/XHR request interception library for Node.js, currently at v0.6.3 (stable). It monkey-patches native modules like http, https, fetch, and XMLHttpRequest to intercept all outgoing requests, allowing custom logic to be applied before responses are sent. Unlike high-level mocking libraries (e.g., nock, sinon), it provides no request matching or routing—just raw interception. It is designed as a building block for tools like MSW. Releases are frequent, with active maintenance and breaking changes in v0.41.0 affecting CJS exports. Ships TypeScript types and supports ESM and CJS.