node-gtfs is a comprehensive Node.js library and CLI toolkit for ingesting, querying, exporting, and updating GTFS (General Transit Feed Specification) transit data. It supports SQLite natively and PostgreSQL/MySQL through Kysely, handling static schedule feeds, GTFS Realtime (alerts, trip updates, vehicle positions), and extended standards (GTFS-Plus, GTFS-Ride, GTFS-to-HTML, TODS, TIDES, NOPTIS). The architecture centers on a declarative schema definition system that compiles to SQL table metadata, enabling robust import/export pipelines and a rich query API with ~50 getter functions. The codebase demonstrates strong engineering practices: parameterized SQL builders, structured error handling, configurable reporting, and comprehensive test coverage. It is actively maintained, uses modern tooling (pnpm, TypeScript, ESM), and provides a reusable foundation for transit data applications.