HTTP Mock Server for Node.js

http-mockserver is a Node.js library designed for easily mocking HTTP servers, primarily used for testing purposes. It allows developers to define static or dynamic responses for specific HTTP methods and URIs on a given port. The current stable version is 2.7.21 (as of April 2026). The package appears to have a consistent maintenance cadence, with recent updates (as seen in the changelog for 2025-2026) focusing on dependency vulnerability fixes and minor bug fixes rather than new features or breaking changes. Key differentiators include its simplicity in defining mock endpoints, support for both static responses and dynamic request handlers (using Express-like `req`, `res` objects), and the ability to start a mock server either programmatically within a Node.js process or as a standalone CLI tool. The CLI option allows interaction from non-Node.js clients via a REST API. It also provides utilities for inspecting request logs and waiting for specific requests to simplify assertion logic in tests.