Node.js: Difference between revisions

Revision as of 00:38, 9 November 2024

Revision as of 06:30, 19 November 2024

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'''Node.js''' is a [[cross-platform]], [[Open-source software|open-source]] [[JavaScript]] [[Runtime environment|runtime environment]] that can run on [[Microsoft Windows|Windows]], [[Linux]], [[Unix]], [[macOS]], and more. Node.js runs on the [[V8 (JavaScript engine)|V8]] [[JavaScript engine]], and executes JavaScript code outside a [[web browser]].

Node.js lets developers use JavaScript to write [[Command-line interface|command line tools]] and for [[server-side scripting]]. The ability to run JavaScript code on the server is often used to generate [[dynamic web page]] content before the page is sent to the user's web browser. Consequently, Node.js represents a "JavaScript everywhere" [[paradigm]],<ref>{{cite web |last=gcuomo |date=24 October 2013 |title=JavaScript Everywhere and the Three Amigos (Into the wild BLUE yonder!) |url=https://www.ibm.com/developerworks/community/blogs/gcuomo/entry/javascript_everywhere_and_the_three_amigos?lang=en |archive-url=https://web.archive.org/web/20131114212619/https://www.ibm.com/developerworks/community/blogs/gcuomo/entry/javascript_everywhere_and_the_three_amigos?lang=en |archive-date=November 14, 2013 |access-date=2013-10-24 |website=www.ibm.com}}</ref> unifying [[web application|web-application]] development around a single [[programming language]], as opposed to using different languages for the server- versus client-side programming.

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JavaScript is the only language that Node.js supports natively, but many [[Source-to-source compiler|compile-to-JS]] languages are available.<ref>{{Cite web|url=https://github.com/jashkenas/coffeescript/wiki/list-of-languages-that-compile-to-js|title=List of languages that compile to JS|website=Github}}</ref> As a result, Node.js applications can be written in [[CoffeeScript]],<ref name="b6">{{cite book |url=https://books.google.com/books?id=Oda-MgEACAAJ&q=nodejs |title=CoffeeScript on Node.js |publisher=O'Reilly Media, Inc. |date=15 April 2013 |access-date = 17 May 2015|isbn=9781449316846 }}</ref> [[Dart (programming language)|Dart]], [[TypeScript]], [[ClojureScript]] and others.

Node.js is primarily used to build network programs such as web servers.<ref name="b2">[https://books.google.com/books?id=KZQQAlhTOBgC&q=nodejs Node.js for PHP Developers], O'Reilly Media, Inc., 2013</ref> The most significant difference between Node.js and [[PHP]] is that most functions in PHP [[Asynchronous I/O|block]] until completion (commands execute only after previous commands finish), while Node.js functions are [[Asynchronous I/O|non-blocking]] (commands execute [[Concurrent computing|concurrently]] and use [[Callback (computer programming)|callbacks]] to signal completion or failure),<ref name="b2"/>, thus opening up new attack surfaces that are inherently absent in most web server applications.

Node.js is officially supported by [[Linux]], {{nowrap|[[macOS]]}} and [[Microsoft Windows]] 8.1 and Server 2012 (and later),<ref name="supportedOS" /> with Tier 2 support for [[SmartOS]] and [[IBM AIX]] and experimental support for [[FreeBSD]]. [[OpenBSD]] also works, and LTS versions are available for [[IBM i]] (AS/400).<ref>{{Cite web |last=Foundation |first=Node js |title=Installing Node.js via package manager |url=https://nodejs.org/en/download/package-manager/ |access-date=2019-05-19 |website=Node.js |language=en}}</ref> The source code may also be built on similar operating systems that are not officially supported, such as [[NonStop OS]]<ref name="bomBora - Node.js for NonStop">{{cite web |title=bomBora - Node.js for NonStop |url=http://infrasoft.com.au/bomBora.html |access-date=14 August 2015 |website=infrasoft.com.au |publisher=Infrasoft |archive-date=11 March 2018 |archive-url=https://web.archive.org/web/20180311040354/http://infrasoft.com.au/bomBora.html |url-status=dead }}</ref> and [[Unix]] servers.