Attachments is a modular, storage‑ and model‑agnostic framework for managing file uploads and preprocessing in Node.js or the browser. It lets developers plug‑in any ORM/ODM (e.g., Mongoose, Sequelize), storage backend (local filesystem, S3, custom remote services) and preprocessors (ImageMagick, custom parsers) to define flexible attachment styles, validation and lifecycle handling directly on their models. The library is aimed at JavaScript developers who need a reusable, configurable solution for handling attachments across different data layers and environments.