connect-mongo

MongoDB session store for Express and Connect written in TypeScript. Current stable version is 6.0.0, released with breaking changes from v4 rewritten in TypeScript. Supports Express 4.x/5.0, Connect 3.x, and MongoDB Node driver 5.x-7.x, with CI testing across Node 20, 22, and 24. Key differentiator is seamless integration with express-session providing MongoDB-backed session persistence, lazy session updates, transparent encryption, and configurable auto-removal of expired sessions. Requires express-session and mongodb as peer dependencies.