Cosa

Cosa is a simplified object modeling library for MongoDB, providing a lightweight abstraction over the MongoDB Node.js driver. The current stable version is 10.1.0, released under the MIT license, with an active maintenance status. It offers a clean, schema-based model definition API with built-in validation and query helpers, focusing on developer productivity without the overhead of a full ODM like Mongoose. The library supports ESM only, requires Node.js >=20, and is built on top of the official MongoDB driver.