Node.js event-based server-side javascript engine Node.js is similar in design to and influenced by systems like Ruby's Event Machine or Python's Twisted. It takes the event model a bit further - it presents the event loop as a language construct instead of as a library. Node.js is bundled with several useful libraries to handle server tasks : System, Events, Standard I/O, Modules, Timers, Child Processes, POSIX, HTTP, Multipart Parsing, TCP, DNS, Assert, Path, URL, Query Strings.