Node.js, or simply Node, is a software platform based on the V8 engine. This engine translates JavaScript into machine code. Node.js turns JavaScript from a highly specialized language into a general-purpose tool.
It gives JavaScript the ability to interact with input/output devices through its API (written in C ++), to connect other external libraries written in different languages, providing calls to them from JavaScript code.
Node is used mainly on the server, acting as a web server. However, it is possible to develop desktop window applications with Node.js, using NW.js, AppJS or Electron for Linux, Windows and macOS.
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