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
    Express ES2017 REST API Boilerplate

    Express ES2017 REST API Boilerplate

    Express starter for building RESTful APIs

    A boilerplate for building RESTful APIs with Node.js and Express, providing a pre-configured structure for efficient backend development.
    Downloads: 0 This Week
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  • 2
    F JavaScript Library is a collection of useful small javascripts.
    Downloads: 0 This Week
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  • 3
    FArP is JavaScript function arguments processor. It provides an easy way to parse function input arguments against expected types and values. Thanks to it developers can avoid chains of if conditions at the beginnings of their functions.
    Downloads: 0 This Week
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  • 4

    FCKEditor plugins

    The plugins for FCKEditor you cant find online

    The idea with the project is to develop all those plugins for FCKEditor that cant usually be found on internet. Size doesn't matter!
    Downloads: 0 This Week
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    FKit

    FKit

    A functional programming toolkit for JavaScript

    FKit (pronounced eff-kit) is a functional programming toolkit for JavaScript. It provides many functions for solving common problems with functions, objects, arrays, and strings. It aims to provide reusable building blocks while maintaining a laser focus on everyday utility.
    Downloads: 0 This Week
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  • 6
    Web gallery based on pre-generated metadata, typically according to directory structure, not database or an administration. Development moved to: http://github.com/martinkozak/fsgal.
    Downloads: 0 This Week
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  • 7
    FSVS

    FSVS

    Full Screen Vertical Scroll

    Simple full-screen vertical slider using CSS3 transitions followed up by a jQuery fallback. Bound events support the mouse wheel, click and drag, arrow keys, and touch gestures.
    Downloads: 0 This Week
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  • 8
    Facebox

    Facebox

    Facebook-style lightbox, built in jQuery

    Facebox is a jQuery-based lightbox plugin designed to display content in a modal overlay on top of a webpage. It allows developers to present images, HTML content, or remote data in a visually appealing popup without navigating away from the current page. The plugin is inspired by early lightbox implementations and focuses on simplicity and ease of integration into existing web projects. It provides a clean user experience by dimming the background and highlighting the modal content, drawing attention to the displayed information. Facebox supports loading content via AJAX, making it useful for dynamic applications where content is fetched on demand. It also includes basic styling and animation effects to enhance usability and presentation.
    Downloads: 0 This Week
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  • 9
    FancyGrid

    FancyGrid

    JavaScript grid library with charts integration & server communication

    JavaScript grid library with charts integration and server communication. Massive number of features, Paging, Sorting, Filtering, Validation, Ajax data, Files data, RESTful, flexible CRUD, Integration with charts, Form module, Theming, Touch Support, and others. FancyGrid is integrated(data binding) with chart libraries, HighCharts, and sparklines. Intelligent modules system auto-detects and loads needed modules. Good Documentation, Elegant API, Number of Samples, and Professional Support.
    Downloads: 0 This Week
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    Fantasy Land Specification

    Fantasy Land Specification

    Specification for interoperability of JavaScript algebraic structures

    This project specifies interoperability of common algebraic structures like Setoid, Ord, Semigroupoid, Category, Semigroup, Monoid, Group, Filterable, Functor, Contravariant, Apply, Applicative, etc. An algebra is a set of values, a set of operators that it is closed under and some laws it must obey. Each Fantasy Land algebra is a separate specification. An algebra may have dependencies on other algebras which must be implemented. "Value" is any JavaScript value, including any which have the structures defined below. "Equivalent" is an appropriate definition of equivalence for the given value. The definition should ensure that the two values can be safely swapped out in a program that respects abstractions. For example, two lists are equivalent if they are equivalent at all indices, two plain old JavaScript objects, interpreted as dictionaries, are equivalent when they are equivalent for all keys, two promises are equivalent when they yield equivalent values, etc.
    Downloads: 0 This Week
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  • 11
    FastClick

    FastClick

    Easy-to-use library to remove click delays on browsers with touch UIs

    FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing of a click event on mobile browsers. The aim is to make your application feel less laggy and more responsive while avoiding any interference with your current logic. FastClick is developed by FT Labs, part of the Financial Times. Note: As of late 2015 most mobile browsers - notably Chrome and Safari - no longer have a 300ms touch delay, so fastclick offers no benefit on newer browsers, and risks introducing bugs into your application. Consider carefully whether you really need to use it. The library has been deployed as part of the FT Web App. FastClick doesn't attach any listeners on desktop browsers.
    Downloads: 0 This Week
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  • 12
    Fawn

    Fawn

    Transactions for MongoDB

    Fawn provides the ability to carry out edits on a mongoDB database as a series of steps. If an error occurs on any of the steps, the database is returned to its initial state (its state before the transaction started). It's based on the two phase commit system described in the MongoDB docs.
    Downloads: 0 This Week
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  • 13
    FeedEk jQuery RSS/ATOM

    FeedEk jQuery RSS/ATOM

    FeedEk jQuery RSS/ATOM Feed Plugin

    FeedEk is a jQuery plugin for parsing and displaying RSS and Atom feeds. You can obtain feeds easily from any domain. No need for server-side scripts. Feed API is used for fetching RSS/Atom feed data.
    Downloads: 0 This Week
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  • 14
    Fetch JSONP

    Fetch JSONP

    Make JSONP request like window.fetch

    Fetch JSONP is a small JavaScript library that provides a Fetch-like API for JSONP requests. Standard Fetch does not support JSONP, so this package fills that specific compatibility gap. Developers can call fetchJsonp, receive a promise, and parse the response with a familiar .json() flow. The library supports custom callback parameter names, custom callback function names, and request timeouts. It also documents the difference between regular JSON APIs and JSONP endpoints, which helps avoid common syntax errors. fetch-jsonp is useful for legacy APIs, older cross-domain integrations, and browser applications that still need JSONP behavior.
    Downloads: 0 This Week
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  • 15
    File Icons

    File Icons

    Atom file-specific icons for improved visual grepping

    File-specific icons in Atom for improved visual grepping. Everything is handled using CSS classes. Use your stylesheet to change or tweak icons. Consult the package stylesheets to see what classes are used. Choose your own shades. Assign icons by file extension. Assign icons to directories. A restart is needed to complete the installation. Reload the window, or restart Atom. As of v2.0, classes are used for displaying icons instead of mixins. If you're a package author, you can integrate File-Icons using Atom's services API.
    Downloads: 0 This Week
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  • 16
    Fitter Happier Text

    Fitter Happier Text

    Performant, fully fluid headings

    Fitter Happier Text is a JavaScript utility that dynamically adjusts text size to perfectly fit within a given container, ensuring optimal readability and layout consistency across different screen sizes. Inspired by responsive design principles, it calculates the maximum font size that allows text to occupy available space without overflowing. The library is particularly useful for headlines, banners, and UI elements where visual balance and proportional scaling are important. It operates by measuring container dimensions and iteratively resizing text until it fits within constraints. The implementation is lightweight and designed to integrate easily into modern frontend projects without heavy dependencies. It can be used in both static and dynamic layouts, adapting to content changes or window resizing events. Overall, fitter-happier-text provides a simple yet effective solution for responsive typography in web applications.
    Downloads: 0 This Week
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  • 17
    Float UI

    Float UI

    Beautiful and responsive UI components and templates

    Float UI is an open-source collection of modern UI components and website templates built primarily for React, with planned support for Vue, designed to help developers rapidly build visually polished and responsive web applications. It combines Tailwind CSS with carefully crafted design patterns to deliver components that are both aesthetically appealing and production-ready. The project includes a wide variety of reusable UI elements and complete templates, such as landing pages, dashboards, and navigation layouts, allowing developers to bootstrap projects quickly. One of its strengths is its focus on simplicity and accessibility, providing ready-made solutions that can be easily customized without complex configuration. Float UI supports both left-to-right and right-to-left layouts, making it suitable for international applications. It is actively maintained and continuously expanded, with new components and templates added over time.
    Downloads: 0 This Week
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  • 18
    Flow Typed

    Flow Typed

    A central repository for Flow library definitions

    High-quality library definitions for Flow. flow-typed is a repository of third-party library interface definitions for use with Flow. When you start a project with Flow, you likely want to use some third-party libraries that were not written with Flow. By default, Flow will just ignore these libraries leaving them untyped. As a result, Flow can't give errors if you accidentally misuse the library (nor will it be able to auto-complete the library). To address this, Flow supports library definitions which allow you to describe the interface of a module or library separate from the implementation of that module/library. The flow-typed repo is a collection of high-quality library definitions, tests to ensure that definitions remain high quality, and tools to make it as easy as possible to import them into your project. All you have to do when you add one or more new dependencies to your project is run flow-typed install.
    Downloads: 0 This Week
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  • 19
    Flowy

    Flowy

    The minimal javascript library to create flowcharts

    flowy is a minimal JavaScript library for building interactive flowchart-style interfaces in web applications, allowing developers to create node-based editors, automation builders, or visual programming tools with relatively little code. It provides draggable, connectable blocks (nodes) that can be placed on a canvas, connected via lines, and rearranged dynamically while preserving the underlying graph structure. The library focuses on simplicity and aesthetics, offering a clean look out of the box that can be customized with your own CSS, making it suitable for dashboards, SaaS products, or internal tools. Events emitted by flowy enable integration with your own data model, so you can sync block positions, connections, and metadata back to a database or application state. It is framework-agnostic, so it can be dropped into vanilla JavaScript projects or wrapped inside React, Vue, or other frameworks.
    Downloads: 0 This Week
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  • 20
    Flummox

    Flummox

    Minimal, isomorphic Flux

    The Flummox project is a Flux implementation designed to provide a more modular, testable, and isomorphic approach to application state management in React environments. It rethinks traditional Flux architecture by eliminating the need for singletons and encouraging explicit dependency injection, making applications easier to test and reason about. The framework is built with modern JavaScript features and emphasizes clear separation of concerns between actions, stores, and components. It supports both client-side and server-side rendering, making it suitable for universal or isomorphic applications. Flummox also promotes a more structured and scalable approach to managing application state compared to earlier Flux implementations. By focusing on modularity and composability, it enables developers to build maintainable and flexible architectures. Overall, flummox represents an evolution of the Flux pattern toward better developer ergonomics and testability.
    Downloads: 0 This Week
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  • 21
    Javascript bindings for C++, a Javascript interpreter/shell & Javascript/C++ module system. It includes a few Javascript classes and modules. It supports easy embedding of Javascript in C++ and vice versa. The currently supported engine is Spidermonkey.
    Downloads: 0 This Week
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  • 22
    Fluster is a clustering algorithm for the Google Maps API v3. It manages all your markers on the map and summarizes them to "clustered markers" if there is not enough space around them. Acts like MarkerClusterer for v2.
    Downloads: 0 This Week
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  • 23
    Form-Data

    Form-Data

    A module to create readable `"multipart/form-data"` streams

    A library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.
    Downloads: 0 This Week
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  • 24
    Fotorama source

    Fotorama source

    A simple, stunning, powerful jQuery gallery

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    Downloads: 0 This Week
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  • 25
    The Frost library is a tool for JavaScript development in widget engines and mobile browsers. We try to create a simple means for unified access to device capabilities and Ajax requests in as many different widget engines and mobile browsers as possible.
    Downloads: 0 This Week
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