package manager for Node.js

 Node.js is an event-based server-side javascript engine.
 .
 npm is the package manager for the Node JavaScript platform. It puts
 modules in place so that node can find them, and manages dependency
 conflicts intelligently.
 .
 It is extremely configurable to support a wide variety of use cases.
 Most commonly, it is used to publish, discover, install, and develop
 node programs.