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A `!JavaScript library`! is a `F33f`_`[library`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Library_(computing)]`_`f of pre-written `F33f`_`[JavaScript`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=JavaScript]`_`f code that allows for easier development of JavaScript-based applications,`:cite-ref-1[`F5bf`_`[1`#cite-note-1]`_`f] especially for `F33f`_`[AJAX`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Ajax_(programming)]`_`f and other `F33f`_`[web-centric`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=World_Wide_Web]`_`f technologies.`:cite-ref-2[`F5bf`_`[2`#cite-note-2]`_`f] They can be included in a website by embedding it directly in the HTML via a script tag.

>>Contents

• `F0af`_`[Libraries`#libraries]`_`f

• `F0af`_`[Frameworks`#frameworks]`_`f

• `F0af`_`[Capabilities and Trade-offs in Modern Frameworks`#capabilities-and-trade-offs-in-modern-frameworks]`_`f

• `F0af`_`[Packages`#packages]`_`f

• `F0af`_`[See also`#see-also]`_`f

• `F0af`_`[References`#references]`_`f

-─

>>Libraries

With the expanded demands for `F33f`_`[JavaScript`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=JavaScript]`_`f, an easier means for programmers to develop such dynamic interfaces was needed.`:cite-ref-3[`F5bf`_`[3`#cite-note-3]`_`f]`:cite-ref-4[`F5bf`_`[4`#cite-note-4]`_`f] Thus, JavaScript libraries and JavaScript widget libraries were developed, allowing for developers to concentrate more upon more distinctive applications of `F33f`_`[Ajax`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Ajax_(programming)]`_`f.`:cite-ref-5[`F5bf`_`[5`#cite-note-5]`_`f] This has led to other companies and groups, such as `F33f`_`[Microsoft`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft]`_`f and `F33f`_`[Yahoo!`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Yahoo!]`_`f developing their own JavaScript-based user interface libraries, which find their way into the web applications developed by these companies.`:cite-ref-6[`F5bf`_`[6`#cite-note-6]`_`f] Some JavaScript libraries allow for easier integration of JavaScript with other web development technologies, such as `F33f`_`[CSS`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Cascading_Style_Sheets]`_`f, `F33f`_`[PHP`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=PHP]`_`f, `F33f`_`[Ruby`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Ruby_(programming_language)]`_`f, and `F33f`_`[Java`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Java_(programming_language)]`_`f, while others provide utilities, often in the form of JavaScript `F33f`_`[functions`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=JavaScript_syntax]`_`f, to make repetitive and complex tasks less taxing.`:cite-ref-7[`F5bf`_`[7`#cite-note-7]`_`f]`:cite-ref-8[`F5bf`_`[8`#cite-note-8]`_`f] Many libraries include code to detect differences between runtime environments and remove the need for applications to allow for such inconsistencies.

Almost all JavaScript libraries are released under either a `F33f`_`[permissive`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Permissive_software_license]`_`f or `F33f`_`[copyleft`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Copyleft]`_`f license to ensure license-free distribution, usage, and modification.`:cite-ref-9[`F5bf`_`[9`#cite-note-9]`_`f]

>>Frameworks

Some JavaScript libraries, such as `F33f`_`[Angular`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Angular_(application_platform)]`_`f, are classified as `F33f`_`[frameworks`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Software_framework]`_`f since they exhibit full-stack capabilities and properties not found in general JavaScript libraries.`:cite-ref-10[`F5bf`_`[10`#cite-note-10]`_`f]`:cite-ref-11[`F5bf`_`[11`#cite-note-11]`_`f]

>>>Capabilities and Trade-offs in Modern Frameworks

JavaScript-based web application frameworks, such as `F33f`_`[React`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=React_(software)]`_`f and `F33f`_`[Vue`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Vue.js]`_`f, provide extensive capabilities but come with associated trade-offs. These frameworks often extend or enhance features available through native web technologies, such as `F33f`_`[routing`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Routing]`_`f, `F33f`_`[component-based development`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Component-based_software_engineering]`_`f, and `F33f`_`[state management`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=State_management]`_`f. While native web standards, including Web Components, modern JavaScript APIs like Fetch and ES Modules, and browser capabilities like `F33f`_`[Shadow DOM`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Web_Components]`_`f, have advanced significantly, frameworks remain widely used for their ability to enhance developer productivity, offer structured `F33f`_`[patterns`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Pattern]`_`f for large-scale applications, simplify handling edge cases, and provide tools for performance optimization. `:cite-ref-0-12-0[`F5bf`_`[12`#cite-note-0-12]`_`f]`:cite-ref-1-13-0[`F5bf`_`[13`#cite-note-1-13]`_`f]`:cite-ref-2-14-0[`F5bf`_`[14`#cite-note-2-14]`_`f]

Frameworks can introduce abstraction layers that may contribute to performance overhead, larger bundle sizes, and increased complexity. Modern frameworks, such as React 18 and Vue 3, address these challenges with features like concurrent rendering, tree-shaking, and selective hydration. While these advancements improve rendering efficiency and resource management, their benefits depend on the specific application and implementation context.

`F33f`_`[Lightweight frameworks`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Lightweight_programming_language]`_`f, such as `F33f`_`[Svelte`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Svelte]`_`f and Preact, take different architectural approaches, with Svelte eliminating the virtual DOM entirely in favor of compiling components to efficient JavaScript code, and Preact offering a minimal, compatible alternative to React. Framework choice depends on an application’s requirements, including the team’s expertise, performance goals, and development priorities. `:cite-ref-0-12-1[`F5bf`_`[12`#cite-note-0-12]`_`f]`:cite-ref-1-13-1[`F5bf`_`[13`#cite-note-1-13]`_`f]`:cite-ref-2-14-1[`F5bf`_`[14`#cite-note-2-14]`_`f]

A newer category of web frameworks, including enhance.dev, Astro, and Fresh, leverages native web standards while minimizing abstractions and development tooling. `:cite-ref-15[`F5bf`_`[15`#cite-note-15]`_`f]`:cite-ref-16[`F5bf`_`[16`#cite-note-16]`_`f]`:cite-ref-17[`F5bf`_`[17`#cite-note-17]`_`f] These solutions emphasize `F33f`_`[progressive enhancement`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Progressive_enhancement]`_`f, `F33f`_`[server-side rendering`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Server-side_rendering]`_`f, and optimizing performance. Astro renders static HTML by default while hydrating only interactive parts. Fresh focuses on server-side rendering with zero runtime overhead. Enhance.dev prioritizes progressive enhancement patterns using Web Components. While these tools reduce reliance on client-side JavaScript by shifting logic to build-time or server-side execution, they still use JavaScript where necessary for interactivity. This approach makes them particularly suitable for performance-critical and content-focused applications. `:cite-ref-0-12-2[`F5bf`_`[12`#cite-note-0-12]`_`f]`:cite-ref-1-13-2[`F5bf`_`[13`#cite-note-1-13]`_`f]`:cite-ref-2-14-2[`F5bf`_`[14`#cite-note-2-14]`_`f]

>>Packages

All `F33f`_`[npm packages`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Node.js]`_`f are JavaScript libraries, but not all libraries are packages. Npm serves as a package manager for packages used in `F33f`_`[Node.js`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Node.js]`_`f runtimes.`:cite-ref-18[`F5bf`_`[18`#cite-note-18]`_`f]`:cite-ref-19[`F5bf`_`[19`#cite-note-19]`_`f] However, some npm packages offer `F33f`_`[CDN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Content_delivery_network]`_`f support for use of the library in both Node.js runtimes as well as the browser.`:cite-ref-20[`F5bf`_`[20`#cite-note-20]`_`f]

>>See also

• `F33f`_`[Ajax framework`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Ajax_(programming)]`_`f

• `F33f`_`[Widget toolkit`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Widget_toolkit]`_`f

• `F33f`_`[List of JavaScript libraries`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=List_of_JavaScript_libraries]`_`f

• `F33f`_`[Comparison of JavaScript-based web frameworks`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Comparison_of_JavaScript-based_web_frameworks]`_`f

>>References

`:cite-note-1`!1.`! `F0af`_`[↑`#cite-ref-1]`_`f `:citerefdavid-sawyer-mcfarland2014`aDavid Sawyer McFarland (2014). `*JavaScript & JQuery: The Missing Manual`*. `F33f`_`[O'Reilly Media`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=O'Reilly_Media]`_`f. p. 106. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 9781491948620.

`:cite-note-2`!2.`! `F0af`_`[↑`#cite-ref-2]`_`f "What is a JS library?". `*Khan Academy`*. Retrieved 2018-01-15.

`:cite-note-3`!3.`! `F0af`_`[↑`#cite-ref-3]`_`f `:citerefpeters2019`aPeters, Siem (2019-04-08). "A Brief History of JavaScript: from Netscape to Frameworks". `*Medium`*. Retrieved 2022-03-15.

`:cite-note-4`!4.`! `F0af`_`[↑`#cite-ref-4]`_`f `:citerefasyncbanana2021`aAsyncBanana (2021-04-21). "A Short History of JavaScript and Its Evolution". `*Medium`*. Retrieved 2022-03-15.

`:cite-note-5`!5.`! `F0af`_`[↑`#cite-ref-5]`_`f `:citerefandy-harris2009`aAndy Harris (2009). `*JavaScript and AJAX For Dummies`*. `F33f`_`[Wiley`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Wiley_(publisher)]`_`f. p. 240. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 9780470417997.

`:cite-note-6`!6.`! `F0af`_`[↑`#cite-ref-6]`_`f `:citerefjake-rutter2011`aJake Rutter (2011). `*Smashing JQuery`*. `F33f`_`[Wiley`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Wiley_(publisher)]`_`f. p. 21. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 9780470977361.

`:cite-note-7`!7.`! `F0af`_`[↑`#cite-ref-7]`_`f `:citerefwalsh2007`aWalsh, David (2007-09-05). "6 Reasons To Use JavaScript Libraries & Frameworks". `*David Walsh Blog`*. Retrieved 2022-03-15.

`:cite-note-8`!8.`! `F0af`_`[↑`#cite-ref-8]`_`f "40 Useful NPM Packages for Node.js Apps in 2021". `*leanylabs.com`*. Retrieved 2022-03-15.

`:cite-note-9`!9.`! `F0af`_`[↑`#cite-ref-9]`_`f `:citerefshelley-powers2010`aShelley Powers (2010). `*JavaScript Cookbook`*. `F33f`_`[O'Reilly Media`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=O'Reilly_Media]`_`f. pp. 389–412. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 9781449395926.

`:cite-note-10`!10.`! `F0af`_`[↑`#cite-ref-10]`_`f "The Difference Between a Framework and a Library". `*freeCodeCamp.org`*. 2019-02-01. Retrieved 2022-03-15.

`:cite-note-11`!11.`! `F0af`_`[↑`#cite-ref-11]`_`f "What is the difference between Library vs Framework?". `*DEV Community`*. Retrieved 2022-03-15.

`:cite-note-0-12`!12.`! `F0af`_`[↑`#cite-ref-0-12-0]`_`f `*JavaScript Frameworks for Modern Web Development: The Essential Frameworks, Libraries, and Tools to Learn Right Now`*. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 978-1484249949.

`:cite-note-1-13`!13.`! `F0af`_`[↑`#cite-ref-1-13-0]`_`f `*Building Native Web Components: Front-End Development with Polymer and Vue.js`*. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 978-1484259047.

`:cite-note-2-14`!14.`! `F0af`_`[↑`#cite-ref-2-14-0]`_`f `*Hands-On JavaScript High Performance: Build faster web apps using Node.js, Svelte.js, and WebAssembly`*. `F33f`_`[ISBN`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ISBN_(identifier)]`_`f 978-1838821098.

`:cite-note-15`!15.`! `F0af`_`[↑`#cite-ref-15]`_`f "Enhance". `*`F33f`_`[GitHub`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=GitHub]`_`f`*.

`:cite-note-16`!16.`! `F0af`_`[↑`#cite-ref-16]`_`f "Astro framework". `*`F33f`_`[GitHub`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=GitHub]`_`f`*.

`:cite-note-17`!17.`! `F0af`_`[↑`#cite-ref-17]`_`f "Fresh". `*`F33f`_`[GitHub`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=GitHub]`_`f`*.

`:cite-note-18`!18.`! `F0af`_`[↑`#cite-ref-18]`_`f "A Clear Definition of npm and What it Does". `*CSS-Tricks`*. 2022-01-20. Retrieved 2022-03-15.

`:cite-note-19`!19.`! `F0af`_`[↑`#cite-ref-19]`_`f "Node.js NPM". `*www.w3schools.com`*. Retrieved 2022-03-15.

`:cite-note-20`!20.`! `F0af`_`[↑`#cite-ref-20]`_`f `:citerefgrosselle2019`aGrosselle, Alessandro (2019-11-12). "The JS library distribution dilemma, NPM or URL?". `*THRON tech blog`*. Retrieved 2022-03-15.

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