Open Source JavaScript Libraries - Page 12
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JavaScript Libraries
View 74 business solutionsBrowse 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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HTML5 Demos and Examples
Collection of hacks and demos showing capability of HTML5 apps
HTML5 Demos and Examples is a classic collection of HTML5 experiments and demonstration files created to show the capabilities of modern web APIs and browser technologies during the rise of HTML5. The repository is an archive of interactive examples—ranging from canvas tricks to video, audio, drag-and-drop, WebSockets, and more—that illustrate how HTML, CSS, and JavaScript can combine to build rich, browser-centric experiences without plugins. Each demo is a self-contained piece of code you can open, explore, and learn from, and the collection was curated to help developers grasp emerging standards at a time when HTML5 was gaining traction and not yet ubiquitous. Though no longer actively maintained, the archive still contains hundreds of creative examples that can teach fundamentals and spur experimentation with web features. Developers historically used it as a reference when testing browser support for features or teaching newcomers how specific APIs behave in real code. -
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Highland
High-level streams library for Node.js and the browser
Highland is a JavaScript library designed to simplify working with streams and asynchronous data flows by providing a functional programming interface on top of Node.js streams. It allows developers to process data in a declarative and composable way, treating streams as sequences that can be transformed using familiar functional patterns such as map, filter, reduce, and flatMap. The library abstracts away much of the complexity of handling backpressure and asynchronous callbacks, enabling developers to focus on data transformation logic rather than low-level stream management. Highland supports both synchronous and asynchronous sources, including arrays, events, promises, and Node streams, making it highly versatile. It also emphasizes lazy evaluation, meaning that data is processed only when needed, improving performance and efficiency in large data pipelines. -
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Javascript library to check in a web page if an user is active or idle, action detected by mouse move or key down, depending user's state linked action will be launched more or less often.
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Image Map Resize
Responsive HTML Image Maps
This is a simple library that makes HTML Image Maps responsive so that they automatically stay scaled to the size of the image they are attached to. It detects the window being resized and updates the coordinates of the image map accordingly. This library can be used with or without jQuery. -
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Image Select
Image Select is an extension of Chosen, a jQuery plugin
We designed this plugin extension as a humanized UI element for social networking sites that need to facilitate relations between people. Research shows that people are extremely sensitive to photos of others, so we needed to revamp the traditional UI elements to make them more intuitive and human. You can use these plugin extensions for modeling multiple (one-to-many) or single (one-to-one) relations between people. We couldn't find any scripts that had this full functionality, so we developed it ourselves on top of Chosen. Hope you find it helpful, and get back if you have any feedback/improvements. -
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Intermock
Mocking library to create mock objects with fake data for TypeScript
Intermock is a TypeScript utility developed by Google that automatically generates mock objects and JSON data for TypeScript interfaces using the Faker library. It simplifies frontend and API testing by creating realistic, schema-compliant mock data directly from interface definitions, eliminating the need for manual mock creation. Intermock supports a wide range of TypeScript constructs including interfaces, unions, generics, mapped types, and tuples, ensuring comprehensive type coverage. It can be used both via a command-line interface (CLI) and programmatically through its API, making it suitable for integration into build pipelines or development environments. The tool also allows fine-grained control over output format—object, JSON, or string—and supports JSDoc annotations to define custom Faker data generators. By leveraging Intermock, developers can quickly generate realistic mock datasets for testing, prototyping, and documentation purposes without writing boilerplate code. -
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Intro.js
Lightweight library for creating step-by-step customer onboarding
Intro.js is a lightweight library for creating step-by-step customer onboarding. You can install Intro.js in a few simple steps. Intro.js consists of two main files, the JavaScript part and the CSS part which renders the elements nicely. The simplicity of Intro.js API will help you to develop an advanced onboarding for your products. Intro.js is lightweight, 10kB and has no external dependencies! Intro.js provides various ways to configure your product onboarding and customize every single step of your tour. Intro.js is Free and open-source, published under AGPL license. We also provide commercial license, supporting your team to successfully integrate Intro.js! Intro.js is AGPL-licensed and open-source. However, if you want to use Intro.js in your commercial app, website or plugin, you would need to obtain a commercial license. -
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Involt
Inject hardware interactions directly into HTML layout
An easy way to think outside the box. Simplicity of HTML and CSS combined with hardware interactions. Create your app using only basic knowledge of HTML, CSS, and Arduino. Instead of learning advanced coding focus on overall experience and quickly develop results. Using CSS allows you to work on the layout and interfacing with the device at once. Involt comes with a UI kit to help you get started. The foundation of Involt is overcoming obstacles that block many concepts from making it to the real world. There are many prototyping tools for software and hardware but none covers both. With its fresh approach, inject tangible interactions into your app like never before. -
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Ionflux Computer Graphics Toolkit
Toolkit for 2D and 3D computer graphics
NOTICE: This repository of IFCG will no longer be maintained. You can find the current version at https://github.com/TehFlux/ifcg The Ionflux Computer Graphics Toolkit is a collection of libraries for 2D and 3D graphics processing. The toolkit is written primarily in C++ and has full Python bindings for all components. -
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JAgile (or "Java Agile") is a simple but practical framework in Java. It implements some JEE Patterns as Transfer Object, Session Facade, Business Object, DAO Factory and DAO. Its unique persistence implementation is the Hibernate Framework.
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JMG
JavaScript GUI library.
JMG is a JavaScript GUI library. The goal of the project is to allow developers, the creation of responsive web applications using the same code for desktop and mobile devices. -
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JS Bits
JavaScript concepts with code
JS Bits is an open-source collection of JavaScript concepts explained through concise code examples and clear explanations that serve as a practical learning resource for both beginners and experienced developers. It breaks down essential parts of the language — such as core syntax, quirky behaviors, functions, scope, closures, asynchronous patterns, and commonly misunderstood features — into digestible pieces that make it easier to internalize how JavaScript really works in modern development. The repository is organized by topic so that learners can jump directly into areas they want to reinforce or explore, and community contributions are welcomed to expand coverage or add alternative explanations. Rather than being a formal textbook, js-bits acts like a developer’s code-centric cheat sheet that helps bridge the gap between abstract language specifications and real usage patterns in the browser or Node.js. -
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JSDo5an is simple JavaScript library for validating user input. All you have to do is to specify the validation rules.Documentation, tutorials on how to use the API can be found at http://www.khaledinho.com/main/?page_id=43
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JSNAV - a library that allows to specify and save some javascript calls in the page's URI. This library helps to standardize the coding javascript URI handler in the anchors. Also it helps to keep the classic navigation anchors.
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JSVerbalExpressions
JavaScript Regular expressions made easy
VerbalExpressions is a JavaScript library that helps to construct difficult regular expressions. Methods have a return type of VerbalExpression except where mentioned otherwise. If there is no mention of a method’s parameters, it is to be assumed that it has none. VerEx is the function that is exported from within VerbalExpressions.js and is to be the first method in chains that describe verbal expressions. Construct and return a new instance of VerbalExpression. Used to support the new VerbalExpression() syntax in ES6 classes as mandated by the spec. You usually wouldn’t need to call VerEx().constructor(). This method will not be accessible from outside the source file since VerEx() returns an instance of the class rather than the class itself. sanitize is a static method on the VerbalExpression class. However, it is also exposed as VerEx().sanitize. Enabling control multi-line matching would cause the expression to not look for matches beyond the first line. -
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JScriptTouch is an SDK which allows developers quickly create full featured applications for iPhone platform using javascript.
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You want to develop a javascript game or make your webpages dynamic. This project creates freely available javascript interfaces such as one to help you create board games, one that contains several animations for images, ... Programmers, enjoy!
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JavaScript & Node.js Testing
Comprehensive and exhaustive JavaScript & Node.js testing
This project compiles practical advice for testing JavaScript applications across the stack, emphasizing clarity, speed, and reliability over dogma. It distinguishes between different kinds of tests—unit, integration, end-to-end—and shows when each is appropriate given time and risk constraints. The guide focuses on removing flakiness by isolating side effects, controlling randomness, and stabilizing async code paths. It also demonstrates test design techniques like arranging test data, using expressive assertions, and structuring test suites for readability and discoverability. Tooling agnosticism is a theme: patterns are illustrated with popular tools but written to survive framework churn. The end goal is a test suite that acts as living documentation while catching regressions quickly and deterministically. -
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JavaScript Array Explorer
A resource to figure out what JavaScript array method would be best
Array Explorer is an educational web-based resource created by Sarah Drasner to help developers understand and select the appropriate JavaScript array method (like map, filter, reduce, find, etc.) when they’re stuck wondering “which one should I use?” Instead of diving into endless docs, you can use the interactive tool to specify what you’re trying to accomplish—e.g., “remove items,” “transform items,” “find something,” “aggregate results”—then see which methods match and get live code examples. The tool provides visual examples, explanations of method semantics, and code snippets you can copy into your own project. Because many JavaScript learners struggle with which array method to choose or misuse them, this resource offers an approachable way to learn by doing and exploring rather than memorizing. The front-end is friendly and responsive, with filtering UI that lets you narrow based on the kind of task you’re performing. -
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JavaScript Load Image
Load images provided as File or Blob objects or via URL
JavaScript-Load-Image is a client-side image loading and processing library that focuses on turning File/Blob objects or remote URLs into HTML <img> or <canvas> elements, optionally transformed in the process. It is often used in upload flows where images need to be previewed, resized, rotated, or cropped before being sent to a server, reducing bandwidth and improving user experience. The library can interpret image metadata, including Exif and IPTC tags, and can extract embedded thumbnails when present, which is handy for building fast image pickers or galleries. One of its key capabilities is correcting Exif Orientation, so photos taken on mobile devices appear upright without additional server-side processing. It also offers the option to preserve or restore image headers when resizing, which helps retain metadata or orientation information in the re-encoded image. -
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JavaScript Object Graph for Java is a library designed to simplify working with JSON objects in Java code.
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Javascript CRT
Cross browser Javascript library that provides old style text mode
Cross browser Javascript library that provides old style text mode -
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Javascript Moony Parser
library: parsing text by given grammar in javascript
This is a javascript library for parsing texts. The library accepts minimalistic moony grammar language and parses given text by the grammar. It is an implementation of "Earley" parser which makes it context free grammar complete. Instructions are bundled in download. -
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JsAction
JsAction is a small event delegation library
JSAction is a JavaScript framework developed by Google that provides a structured, event-driven architecture for managing user interactions in large-scale web applications. It simplifies event handling by declaratively binding actions to DOM elements through HTML attributes, enabling clean separation between markup and behavior. JSAction helps improve performance, maintainability, and reliability by minimizing the use of inline scripts and global event listeners. It is especially useful in complex front-end environments where efficient event delegation and well-defined interaction flows are crucial.
