Modern Extensible FTP Server

ftp-srv is a modern and extensible FTP server library for Node.js, currently stable at version 4.6.3. It provides a promise-based API for creating FTP and FTPS (Explicit & Implicit TLS) servers with support for both passive and active data transfers. The project maintains an active release cadence, frequently publishing bug fixes and minor features, as seen in recent updates like recursive directory creation and TypeScript declaration improvements. Its key differentiators include a highly extensible file system per connection, allowing for custom storage backends, and comprehensive support for various FTP commands and connection modes. It differentiates itself by offering detailed control over passive connection URLs and port ranges, addressing complexities often found in network deployments behind NATs or firewalls. It requires Node.js version 12 or higher.