Node.js Handbook
Node.js is a runtime environment for JavaScript that runs on the server. Node.js is open-source, cross-platform, and since its introduction in 2009, it got hugely popular and now plays a significant role in the web development scene. If GitHub stars are one popularity indication factor, having 46000+ stars means being very popular. Node.js is built on top of the Google Chrome V8 JavaScript engine, and it's mainly used to create web servers - but it's not limited to that.
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