Оригинальную документацию можно прочесть на сайте или скачать с GitHub.
Original documentation lives at nodejs.org/api.html and in GitHub repo.
Node is the evented I/O for V8 javascript. Node's goal is to provide an easy way to build scalable network programs, it is similar in design to and influenced by systems like Ruby's Event Machine or Python's Twisted. Website: http://nodejs.org