JavaScript is a versatile language used to create dynamic and interactive web applications. Here are 40 of the most popular and useful JavaScript libraries and frameworks:

Popular Frameworks

  1. React: A component-based library for building user interfaces.
  2. Vue.js: A progressive framework for building user interfaces.
  3. Angular: A comprehensive framework for building web applications.
  4. Ember.js: A framework for building ambitious web applications.
  5. Svelte: A component-based framework that compiles to efficient JavaScript.

UI Libraries

  1. Bootstrap: A popular CSS framework for building responsive websites.
  2. Material-UI: A React component library based on Google’s Material Design.
  3. Semantic UI: A human-friendly semantic HTML framework.
  4. Foundation: A responsive front-end framework.
  5. Bulma: A modern CSS framework based on Flexbox.

State Management Libraries

  1. Redux: A predictable state container for JavaScript apps.
  2. Vuex: The official state management library for Vue.js.
  3. MobX: A simple, scalable state management solution.
  4. zustand: A small, fast, and flexible state management solution.
  5. Recoil: A Facebook experiment for managing local state in React apps.

Testing Frameworks

  1. Jest: A JavaScript testing framework by Facebook.
  2. Mocha: A flexible JavaScript test framework.
  3. Chai: A BDD/TDD assertion library for Node.js and the browser.
  4. Cypress: A next-generation end-to-end testing framework.
  5. Jasmine: A behavior-driven development framework for testing JavaScript code.

Build Tools

  1. Webpack: A module bundler for modern JavaScript applications.
  2. Parcel: A zero-configuration web bundler.
  3. Rollup: A module bundler designed for building ES modules.
  4. Gulp: A task runner for automating repetitive tasks.
  5. Grunt: A task runner for automating JavaScript development workflows.

Node.js Frameworks

  1. Express.js: A fast, unopinionated, and minimalist web framework for Node.js.
  2. Koa.js: A new web framework for Node.js based on generators.
  3. NestJS: A progressive Node.js framework for building efficient and scalable server-side applications.
  4. Fastify: A high-performance web framework for Node.js.
  5. AdonisJS: A full-stack Node.js framework for building web applications.

Other Popular Libraries

  1. Lodash: A utility library for JavaScript that provides modular functions.
  2. Moment.js: A JavaScript date library for parsing, validating, manipulating, and formatting dates.
  3. Axios: A promise-based HTTP client for the browser and Node.js.
  4. jQuery: A popular JavaScript library for DOM manipulation and AJAX requests.
  5. D3.js: A JavaScript library for manipulating documents based on data.
  6. Three.js: A JavaScript library for creating and displaying 3D graphics in a web browser.
  7. Chart.js: A simple, flexible JavaScript charting library.
  8. Leaflet: A JavaScript library for interactive maps.
  9. Swiper: A free and modular swiper for touch-enabled devices.
  10. Leaflet.js: A JavaScript library for interactive maps.

This list is just a small sample of the many excellent JavaScript libraries and frameworks available. The best choice for your project will depend on your specific needs and preferences.