williamkapke/mongo-mock

mongo-mock is an in-memory, Node.js-based MongoDB emulator that provides a drop-in replacement for the official MongoDB driver, enabling basic CRUD operations without requiring a real MongoDB connection. It's ideal for developers who need to run tests or quickly prototype applications without setting up a MongoDB instance, or for scenarios where connecting to a real database isn't feasible. The project encourages community contributions to expand its feature set and offers optional persistence to disk for data retention between sessions.