Vue.js JavaScript Framework

Vue.js is a free and open-source JavaScript framework for building user interfaces and single-page applications. Created by Evan You (former Google engineer who worked on AngularJS) in 2013 and released in February 2014, Vue has become one of the top three frontend frameworks alongside React and Angular. Key features: progressive framework: the core focuses only on the view layer, integrable into existing projects via script tag without a build step. For complex apps, Vue scales up with official libraries (Vue Router, Pinia) and Vite build toolchain. Component-based: applications built from reusable, self-contained components with template, script, and style. Components communicate via props, events, and slots. Composition API: introduced in Vue 3 (2020), organizes component logic into reusable functions (composables) for better TypeScript support and code organization. Reactivity system: based on JavaScript Proxies (Vue 3) that automatically track dependencies and trigger updates when data changes. Virtual DOM with optimized diffing. Single-File Components (.vue files) combining template, script, and style with scoped styles. Vite build tool: near-instant hot module replacement. TypeScript: Vue 3 is written in TypeScript with first-class type inference. DevTools: browser extension for component inspection, state management, and performance profiling. MIT.