![]() When Node.js needs to perform an I/O operation, like reading from the network, access a database or the filesystem, instead of blocking the thread Node.js will resume the operations when the response comes back, instead of wasting CPU cycles waiting. ![]() Node provides a set of asynchronous I/O primitives in its standard library that will prevent JavaScript code from blocking and generally, libraries in Node.js are written using non-blocking paradigms, making a blocking behavior an exception rather than the normal. Thanks to this, JavaScript code running in Node.js can become very performant.Ī Node.js app is run by a single process, without creating a new thread for every request. Node.js is able to leverage the work of the engineers that made (and will continue to make) the Chrome JavaScript runtime blazing fast, and this allows Node.js to benefit from the huge performance improvements and the Just-In-Time compilation that V8 performs. Node.js runs the V8 JavaScript engine, the core of Google Chrome, outside of the browser. If GitHub stars are one popularity indication factor, having 58000+ stars means being very popular. 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. Node.js is a runtime environment for JavaScript that runs on the server. ![]() This handbook is a getting started guide to Node.js, the server-side JavaScript runtime environment. Note: you can get a PDF, ePub, or Mobi version of this handbook for easier reference, or for reading on your Kindle or tablet.
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