Browse free open source JavaScript Libraries and projects below. Use the toggles on the left to filter open source JavaScript Libraries by OS, license, language, programming language, and project status.

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  • 1
    SuperTest

    SuperTest

    Super-agent driven library for testing node.js HTTP servers

    A super-agent driven library for testing node.js HTTP servers using a fluent API. The motivation with this module is to provide a high-level abstraction for testing HTTP, while still allowing you to drop down to the lower-level API provided by superagent. Install SuperTest as an npm module and save it to your package.json file as a development dependency. You may pass an http.Server, or a Function to request(), if the server is not already listening for connections then it is bound to an ephemeral port for you so there is no need to keep track of ports. One thing to note, is that superagent now sends any HTTP error (anything other than a 2XX response code) to the callback as the first argument if you do not add a status code expect (i.e. .expect(302)). Expectations are run in the order of definition. This characteristic can be used to modify the response body or headers before executing an assertion.
    Downloads: 1 This Week
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  • 2
    Ultimate React Course

    Ultimate React Course

    https://github.com/jonasschmedtmann/ultimate-react-course

    Ultimate React Course is the official repository for Jonas Schmedtmann’s Ultimate React course. It provides starter files, final project code, and FAQs that support a complete React learning path from fundamentals to more advanced application patterns. The course materials cover modern React development with components, props, state, effects, forms, routing, data fetching, state management, and larger real-world projects. Learners can begin each section from starter code, then compare their work against the final implementation when debugging or reviewing concepts. The repository is primarily an educational companion rather than a reusable app framework. It is useful for students who want a structured React practice environment with many examples built exactly as shown in the course.
    Downloads: 1 This Week
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  • 3
    Vanilla JS Projects

    Vanilla JS Projects

    Course with Vanilla JS Projects

    JavaScript Basic Projects is a collection of small applications for practicing browser programming with vanilla JavaScript. The repository contains 29 projects that progress from simple interface interactions to larger applications using external data. Early exercises cover counters, navigation bars, modals, tabs, menus, sliders, and countdown timers. Later examples introduce object-oriented programming, filtering, pagination, dark mode, and dynamic product interfaces. API-oriented projects work with jokes, users, cocktails, Wikipedia content, and other remote data sources. Each project provides a focused environment for learning DOM manipulation, events, application state, and JavaScript logic without a front-end framework. The collection accompanies a larger JavaScript course but can also be explored independently.
    Downloads: 1 This Week
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  • 4
    chatgpt.js

    chatgpt.js

    A powerful, open source client-side JavaScript library for ChatGPT

    A powerful client-side JavaScript library for ChatGPT. chatgpt.js is a powerful JavaScript library that allows for super easy interaction w/ the ChatGPT DOM. chatgpt.js was written w/ ultra flexibility in mind.
    Downloads: 1 This Week
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  • 5
    decimal.js

    decimal.js

    An arbitrary-precision Decimal type for JavaScript

    decimal.js is a JavaScript library that provides an arbitrary-precision decimal data type designed to overcome the limitations of native floating-point arithmetic in JavaScript. It allows developers to perform accurate calculations with numbers of virtually unlimited precision, making it especially useful for financial, scientific, and high-precision applications. Unlike standard JavaScript numbers, which can produce rounding errors due to binary representation, decimal.js ensures consistent and predictable results by operating on decimal values directly. The library defines a Decimal constructor that accepts numbers, strings, or existing Decimal instances, enabling flexible usage across different input types. It supports a wide range of mathematical operations, including arithmetic, logarithmic, trigonometric, and exponential functions, making it significantly more comprehensive than simpler numeric libraries.
    Downloads: 1 This Week
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  • 6
    jCanvas

    jCanvas

    A jQuery plugin that makes the HTML5 canvas easy to work with

    jCanvas is a jQuery plugin that makes the HTML5 canvas easy to work with. jCanvas is a JavaScript library, written using jQuery and for jQuery, that wraps around the HTML5 canvas API, adding new features and capabilities, many of which are customizable. Capabilities include layers, events, drag-and-drop, animation, and much more. The result is a flexible API wrapped up in a sugary, jQuery-esque syntax that brings power and ease to the HTML5 canvas.
    Downloads: 1 This Week
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  • 7
    jQuery MultiSelect

    jQuery MultiSelect

    Turn a multiselect list into a nice and easy to use list with checkbox

    Turn a multiselect list into a nice and easy to use list with checkboxes. This plugin is simply an alternative interface for the native select list element. When you check an option in the plugin the value is selected on the native list. This allows the value to be submitted in a form as well as retreived through normal POST/GET and javascript methods.
    Downloads: 1 This Week
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  • 8
    lodash

    lodash

    Modern JavaScript utility library delivering modularity & performance

    A modern JavaScript utility library delivering modularity, performance & extras. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. Lodash’s modular methods are great for iterating arrays, objects, & strings, manipulating & testing values, and creating composite functions. Lodash is available in a variety of builds & module formats. Lodash is released under the MIT license & supports modern environments. Review the build differences & pick one that’s right for you. Lodash is available in a variety of builds & module formats. Tested in Chrome 74-75, Firefox 66-67, IE 11, Edge 18, Safari 11-12, & Node.js 8-12.
    Downloads: 1 This Week
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  • 9
    mall-admin-web

    mall-admin-web

    frontend component of the “mall” e-commerce system

    mall-admin-web is the frontend component of the “mall” e-commerce system, implemented in Vue (plus Element UI) to deliver the backend management interface: product management, order management, member management, promotions, operations, content, statistics and settings. It demonstrates how a modern single-page application can be structured to integrate with the backend services described in the learning / microservice projects, including authentication (JWT or token), REST APIs, role/permission management and real-time dashboards. The codebase offers modular UI architecture, Vue component patterns, dynamic menu and permission handling, and visualization of statistics and reports. For teams building an admin portal or internal operations system, this project provides a concrete blueprint for UI design, API integration, state management and role-based access control. It also shows how to work with enterprise features (search, pagination, batch actions, uploads) in a consistent framework.
    Downloads: 1 This Week
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  • 10
    plotly.js

    plotly.js

    JavaScript charting library behind Plotly and Dash

    Plotly JavaScript Open Source Graphing Library. Built on top of d3.js and stack.gl, Plotly.js is a high-level, declarative charting library. plotly.js ships with over 40 chart types, including 3D charts, statistical graphs, and SVG maps. plotly.js is free and open source and you can view the source, report issues or contribute on GitHub. For plotly.js to build with Webpack you will need to install ify-loader@v1.1.0+ and add it to your webpack.config.json. This adds Browserify transform compatibility to Webpack which is necessary for some plotly.js dependencies. When users hover over a figure generated with plotly.js, a modebar appears in the top-right of the figure. This presents users with several options for interacting with the figure. When users hover over a figure generated with plotly.js, a modebar appears in the top-right of the figure. This presents users with several options for interacting with the figure.
    Downloads: 1 This Week
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  • 11
    redux-router

    redux-router

    Redux bindings for React Router

    The redux-router project is a library that integrates React Router with Redux by storing routing state directly inside the Redux store. This approach allows developers to treat navigation as part of the global application state, enabling consistent state management across the entire app. By synchronizing route changes with Redux actions, it becomes easier to trigger navigation programmatically and respond to route updates using familiar Redux patterns. The library maintains compatibility with the existing React Router API, ensuring that standard components and navigation methods continue to work seamlessly. It also enables advanced capabilities such as time-travel debugging, where navigation history can be replayed using Redux DevTools. Additionally, it supports serialization and deserialization of routing state, making it useful for server-side rendering and debugging scenarios.
    Downloads: 1 This Week
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  • 12
    simpleParallax.js

    simpleParallax.js

    Simple and tiny JavaScript library that adds parallax animations

    simpleParallax.js is a very simple and tiny Vanilla JS library that adds parallax animations on any image. Where it may be laborious to get results through other plugins, simpleParallax.js stands out for its ease and its visual rendering. The parallax effect is directly applied to image tags, there is no need to use background images.
    Downloads: 1 This Week
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  • 13
    tmi.js

    tmi.js

    Javascript library for the Twitch Messaging Interface

    Connect to and interact with Twitch chat (IRC) from Node.js or a browser. Control the delay in milliseconds between JOIN requests when using the channels array option. Minimum of 300 milliseconds. If the identity has special permission from Twitch for a higher join rate then you should implement your own calls to the client.join method. Disable receiving JOIN/PART events for other users. Good for decreasing network traffic when joining lots of channels or you don't care about this data. After a threshold per channel Twitch stops sending this data so it may not be necessary for all cases. Channels to automatically join upon connecting. The rate of joins is controlled by the options.joinInterval option. Automatically reconnect the client if it gets disconnected for any reason. Sometimes Twitch will request the client to reconnect and tmi.js will disconnect and reconnect even if this option is set to false.
    Downloads: 1 This Week
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  • 14
    vapor.js

    vapor.js

    The World's Smallest & Fastest JavaScript Library

    vapor.js is a joke JavaScript framework presented as the smallest and fastest library possible. Its central joke is that it provides functionality in zero lines of code, making it a parody of lightweight framework marketing. The repository includes files and packaging artifacts, but the actual concept is intentionally empty. It can be “used” by including an empty script tag or omitting the script entirely. The project became a humorous reference point in the JavaScript community because it satirizes exaggerated performance claims and framework minimalism. It is useful mainly as developer humor, historical internet culture, and a playful reminder that sometimes the fastest dependency is no dependency.
    Downloads: 1 This Week
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  • 15
    LombokCharts

    LombokCharts

    Canvas and SVG renderers, LTTB decimation,real-time streaming layer

    LombokCharts A zero-dependency charting library for the browser. It pairs a small grammar-of-graphics core (Data → Scale → Mark) with pluggable Canvas and SVG renderers, LTTB decimation, and a real-time streaming layer — so the same API draws a five-point bar chart or a five-million-point line without changing shape.
    Downloads: 16 This Week
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  • 16
    multiOTP open source

    multiOTP open source

    PHP strong authentication library, web interface & CLI, OATH certified

    multiOTP is a PHP class, a powerful command line utility and a web interface developed by SysCo systèmes de communication sa in order to provide a completely free and easy operating system independent server side implementation for strong two factors authentication solution. multiOTP supports hardware and software tokens with different One-Time Password algorithms like OATH/HOTP, OATH/TOTP and mOTP (Mobile-OTP). QRcode generation is also embedded in order to support provisioning of Google Authenticator software tokens. SMS code sending is currently implemented for several providers (ASPSMS, Clickatell and IntelliSMS). The data storage of the command line utility is by default flat files based in order to simplify deployment in a few minutes, but MySQL backend is supported too. multiOTP can be easily integrated in RADIUS servers like FreeRADIUS under Linux/Windows or TekRADIUS LT under Windows. multiOTP is also the engine of the credential provider multiOTP Credential Provider.
    Downloads: 16 This Week
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  • 17

    Api Update

    Get the version of Javascript API you need

    You can found here all the versions of each major API available for your Javascript projects or for your Web site. Get the last update of your favorite API, or any older version you need. Jquery,Jquery UI, Prototype, MooTools ... For using them in your Web site, you can find the necessary shortcuts to the lastest version of each library in our Wiki page:
    Downloads: 1 This Week
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  • 18
    PDF API HTML5 Web Apps

    PDF API HTML5 Web Apps

    Mini SDK JavaScript API library PDF web apps

    A condensed library designed to web modern applications, to quickly export your content html to pdf thanks the famous library in javascript: jsPDF. And a special thanks to the project canvg and html2canvas. Project documentation: http://ulmdevice.altervista.org/pdfapihtml5/#documentation ========== Also available service for Angular 7+: http://ulmdevice.altervista.org/pdfjsapi/ Mobile Applications: http://bit.ly/1MrlgKk Opera add-on: http://bit.ly/1kkMhTa
    Downloads: 3 This Week
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  • 19

    iLib

    The most comprehensive library of Javascript i18n classes available

    Note: development has been moved over to github! Please see https://github.com/iLib-js/iLib "I18N" means way more than just translation. Other libraries claim to be an i18n solution when translation and string formatting is really all they offer. Yes, iLib has classes that do translation too, but there is also much, much more. From date formatting to name parsing to phone number handling to collation, iLib has classes that do it. And, it has the ability to support thousands of possible locales. Everything in iLib is written in pure JS with minimal platform dependencies, so it works the same way in many different environments and browsers, from Chrome to Opera to node to Qt/QML. Over 17K unit tests help to guarantee this. ILib is also the library of choice for enyo apps on webOS which ships on over 10 million LG SmartTVs in over 135 countries. Give it a try and see if it can work for your app too!
    Downloads: 3 This Week
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  • 20
    jit enables lazy loading of javascript resources by injecting proxy functions that will load the required script the first time they are used.
    Downloads: 3 This Week
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  • 21

    jsdk2

    JSDK is JavaScript Development Kit.

    JSDK is a JavaScript framework, have a small core file and many extension libraries, have the following features: Lang-Extension, BOM,DOM,Event, Reflect, AOP, Thread,JS2D, JSGF and JSUI. You can use the JSDK to develop web application , JS games, or web widgets.
    Downloads: 2 This Week
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  • 22
    Active Graphs and Charts

    Active Graphs and Charts

    Add Powerful reporting features to your Web / Intranet pages and appli

    With the advanced graphing functionality you will be quickly adding impressive and dynamic charting capabilities. The graphing software is completely self contained within a single file making this an ideal solution for the incorporation of graphs and charts into web / intranet pages and applications. Versatile components provide the ability for web authors and developers to easily build and publish dynamic and interactive graphs and charts.
    Downloads: 1 This Week
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  • 23
    Common Litt

    Common Litt

    Simple java script library for auto literation, input tool.

    This project focuses of auto conversion in between language alphabets. Using this 'lit.js' library currently you can done conversion in between English - Tamil - Sinhala scrpits vise-versa. This is use full when you need to know how write something in an other given language. This is still at development stage but works purfectly and easy to customize as well. Live demo available at: http://commonlitt.42web.io/ For UI creations I had used Bootstrap and Jquery. For easy array creation using the text based dictionaries, I had used a c sharp program 'LangSeperator' . That is also available here.
    Downloads: 1 This Week
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  • 24

    Device Motion Gesture for JavaScript

    JavaScript library for recording and recognising device gestures.

    A JavaScript library for detecting gestures made by the user whilst holding their mobile device. The software converts the continual stream of motion readings into distinct gesture events. All you need to do is attach event-handlers to the gestures. Your functions get called when the user makes the gesture with the device. The library comes with some pre-recorded gestures. You can also record your own custom gestures using the recorder application. NOTE: This library recognises gestures made by moving the hand-held device in your hand. It does not recognise gestures from video or images.
    Downloads: 1 This Week
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  • 25
    JavaScript Object Graph for Java is a library designed to simplify working with JSON objects in Java code.
    Downloads: 1 This Week
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