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{{short description|JavaScript runtime environment}}
{{Use dmy dates|date=November 2019}}▼
{{Use American English|date=May 2025}}
{{Infobox software
| name = Node.js
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'''Node.js''' is a [[cross-platform]], [[Open-source software|open-source]] [[JavaScript]] [[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
Node.js has an [[event-driven architecture]] capable of [[asynchronous I/O]]. These design choices aim to optimize [[throughput]] and [[scalability]] in web applications with many input/output operations, as well as for [[real-time Web]] applications (e.g., [[real-time communication]] programs and [[browser game]]s).<ref name="readwrite">{{cite web |author=Laurent Orsini |date=2013-11-07 |title=What You Need To Know About Node.js |url=http://readwrite.com/2013/11/07/what-you-need-to-know-about-nodejs |access-date=2022-02-06 |website=readwrite.com}}</ref>
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===Branding===
The Node.js logo features a green hexagon with overlapping bands to represent the cross-platform nature of the runtime.<ref>{{cite web |title=Brand Guide |url=https://nodejs.org/static/documents/foundation-visual-guidelines.pdf |website=Node.js |publisher=OpenJS Foundation |access-date=22 March 2024}}</ref> The Rocket Turtle was chosen as the official Node.js mascot in February 2024 following a design contest.<ref>{{cite web |title=Node.JS on X: "Meet Rocket Turtle there are many ways 👋" |url=https://twitter.com/nodejs/status/1759953849849167878 |access-date=22 March 2024}}</ref>
== Overview ==
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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)
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.
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| 2025-04-22
| 2028-04-30
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| colspan="5" | <small>{{Version |l |show=111101}}</small>▼
| {{Version|p|26.x}}
| {{Version|p|Planned}}
| Lithium<ref name="Codenames" />
| 2026
| 2029
|-
|-
| {{Version|p|28.x}}
| {{Version|p|Planned}}
| Magnesium <ref name="Codenames" />
| 2027
| 2030
|-
|-
| {{Version|p|30.x}}
| {{Version|p|Planned}}
| Neon<ref name="Codenames" />
| 2028
| 2031
|-
|-
| {{Version|p|32.x}}
| {{Version|p|Planned}}
| Oxygen<ref name="Codenames" />
| 2029
| 2032
|-
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| {{Version|p|34.x}}
| {{Version|p|Planned}}
| Platinum<ref name="Codenames" />
| 2030
| 2033
|-
|}
New major releases of Node.js are cut from the [[GitHub]] main branch every six months. Even-numbered versions are cut in April and odd-numbered versions are cut in October. When a new odd version is released, the previous even version undergoes transition to [[Long-term support|Long Term Support]] (LTS), which gives that version 12 months of active support from the date it is designated LTS. After these 12 months expire, an LTS release receives an additional 18 months of maintenance support. An active version receives non-breaking backports of changes a few weeks after they land in the current release. A maintenance release receives only critical fixes and documentation updates.<ref name="Release">{{Cite web|url=https://github.com/nodejs/Release|title=nodejs/Release|website=GitHub|language=en|access-date=2018-05-03}}</ref> The LTS Working Group manages strategy and policy in collaboration with the Technical Steering Committee of the Node.js Foundation.
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{{JavaScript}}
{{Authority control}}
▲{{Use dmy dates|date=November 2019}}
[[Category:2009 software]]
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[[Category:Linux Foundation projects]]
[[Category:Software using the MIT license]]
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