Like JavaScript libraries, JavaScript frameworks are a collection of prewritten code snippets that perform different functions and can be reused. However, whereas JavaScript libraries are a specialized tool for on-demand use, JavaScript frameworks are a complete tool set that helps shape and organize any web application. If you think of the JavaScript application code as a house, the JavaScript framework is the blueprint used to build the house.
Here are some example use cases for JavaScript frameworks:
Web and mobile application development
AngularJS is a framework that simplifies the development and testing of web applications, such as e-commerce applications, real-time applications, and video applications. React Native is another framework that supports natively rendered mobile application development for iOS and Android.
Responsive web development
Responsive websites give a consistent user experience across any device. For example, mobile and tablet screens are smaller than desktop and laptop screens. You want the website to display and present data accurately even on the smaller screen, without, for example, cutting off the ends of the website. Using frameworks such as Bootstrap and Ember.js, developers can benefit from responsive design and easily customize a website's look and feel across different platforms.
Server-side application development
Node.js is a server-side, open-source JavaScript framework that runs JavaScript code outside a browser. Developers use this framework to build scalable, fast, and reliable network-based server-side applications. It can handle HTTP requests and data streams, support file systems, and manage multiple backend processes simultaneously.