Yammy - MongoDB Migration Tool

Yammy is a MongoDB migration library (v2.1.0) designed for programmatic use as a module, unlike CLI-focused alternatives. It supports multiple databases, backward compatibility with migrate-mongo, and uses transactions by default for data integrity. Requires Node.js >=8.0.0 and MongoDB >=2.6 (or >=4.0/4.2 for transactions). Stable release with TypeScript type definitions included, released under MIT license.