Here are 50 JavaScript libraries that will let you us speed up and optimise frontend development workflow and help you to achieve desired result in certain deadline.

Dynamics.js

It is a JavaScript library to create physics-based animations.

Walkway.js

An easy way to animate SVG elements.

SVG Morpheus

JavaScript library enabling SVG icons to morph from one to the other. It implements Material Design’s Delightful Details transitions.

Rune.js

It is for programming graphic design systems with SVG. It features a chainable drawing API, an unobtrusive scene graph, and a range of features aimed specifically at graphic designers: native support for color conversion, grid systems, typography, pixel iteration, as well as an expanding set of computational geometry helpers.

Snap.svg

SVG is an excellent way to create interactive, resolution-independent vector graphics that will look great on any size screen. And the Snap.svg JavaScript library makes working with your SVG assets as easy as jQuery makes working with the DOM.

Vivus

It is a lightweight JavaScript clas that allows you to animate SVGs, giving them the appearence of being drawn. There are a variety of different animations available, as well as the option to create a custom script to draw your SVG in whatever way you like.

lazysizes

High performance and SEO friendly lazy loader for images (responsive and normal), iframes and more, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.

layzr.js

Lazy loading boosts page speed by deferring the loading of images until they’re in (or near) the viewport. This library makes it completely painless – maximizing speed by keeping options to a minimum.

Highlighter.js

Highlighter.js is a tiny library, to allow you to easily navigate, select and highlight the DOM elements.

PleaseJS

Please.js is a polite companion that wants to help you make your projects beautiful. It uses HSV color space to create random pleasing colors as well as color schemes based on a given color. It has two core functions and a bunch of little helpers for you to use.

Numeral.js

Formatting and manipulating numbers.

Sugar

Etends native objects with helpful methods. It is designed to be intuitive, unobtrusive, and let you do more with less code.

Keypress

A robust library for capturing keyboard input.

Boba.js

Boba.js is a small, easily extensible JavaScript library that makes working with Google Analytics easier.

Conditioner.js

For loading and unloading behavior based on environment conditions.

imgix.js

imgix.js allows you to easily use the imgix API to make images on your site or app responsive to device size and pixel density.

Wallop

A minimal 4kb library for showing & hiding things.

FamousEngine

High-performance javascript library for animations & interfaces.

particles.js

It helps you create an animated & interactive Particle System that reacts to viewer’s cursor. Based on Html5 canvas element.

chroma.js

For all kinds of color conversions and color scales.

vibrant.js

Extract prominent colors from an image. Vibrant.js is a javascript port of the awesome Palette class in the Android support library.

gradStop.js

Generate monotone color schemes and equidistant gradient stops.

Random Color

A tiny script for generating attractive random colors.

Gifshot

JavaScript library that can create animated GIFs from media streams, videos, or images.

Sortable

Reorderable drag-and-drop lists on modern browsers and touch devices. No jQuery. Supports Meteor, AngularJS, React and any CSS library, e.g. Bootstrap.

Space.js

A HTML-driven JavaScript-library for narrative 3D-scrolling.

ScrollMagic

ScrollMagic helps you to easily react to the user’s current scroll position.

scrollMonitor

A simple and fast API to monitor elements as you scroll.

Moment.js

Parse, validate, manipulate, and display dates in JavaScript.

MockTheClock

Spoof timers and other date/time functions. Useful for slowing down 3D animations.

dragscroll

Enables scrolling via holding the mouse button (“drag and drop” or “click and hold” style, online demo). It has no dependencies and is written in vanilla JavaScript (which means it works anywhere).

JavaScript Cookie

A simple, lightweight JavaScript API for handling cookies.

clipboard.js

A modern approach to copy text to clipboard.

ContentTools

A JS library for building WYSIWYG editors for HTML content.

Pen Editor

A markdown editor you really want.

Substituteteacher.js

substituteteacher.js lets you substitute sentences for each other, swapping only the words necessary.

Blast

Play with typography, animate letters, break apart words, reassemble sentences..

underlinejs

Pushing the boundary of browser typography rendering!

SweetAlert

An awesome replacement for JavaScript’s alert.

FastClick

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.

Touchpoint-js

A vanilla JavaScript library that visually shows taps/clicks for HTML prototypes using CSS3 transitions on desktop and mobile.

Slip.js

A tiny library for interactive swiping and reordering of elements in lists on touch screens. No dependencies.

QRCode.js

QRCode.js supports Cross-browser with HTML5 Canvas and table tag in DOM. QRCode.js has no dependencies.

Piecon

Utility that allows you to add a piechart as your favicon. It’s a small library, but shows some pretty neat potential.

Circle

Circles makes creating the charts very easy. Circles generates the SVG chart on the fly.

Resemble.js

It analyses and compares images with HTML5 canvas and JavaScript.

PhotoSwipe

JavaScript image gallery for mobile and desktop, modular, framework independent.

Ideal Image Slider

Quite simply the ideal Image Slider in vanilla JS.

Rome

Customizable date (and time) picker. Opt-in UI, no jQuery! Rome synchronizes in real-time with inputs, never steals focus, and its CSS is entirely customizable!

Pikaday

A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS.