Vue.js — The Progressive JavaScript Framework

What it is

Vue.js is a progressive JavaScript framework for building user interfaces. It provides a reactive data binding system, component architecture, and a rich ecosystem including Vue Router for navigation and Pinia for state management. Vue can be used as a lightweight library for enhancing static pages or as a full framework for single-page applications.

Vue targets frontend developers at all skill levels. Its gentle learning curve makes it accessible to beginners, while its Composition API and TypeScript support satisfy the needs of large-scale application development.

How it saves time or tokens

Vue's single-file component format (.vue files) co-locates template, script, and style in one file, reducing context switching during development. The Composition API enables logic reuse through composable functions, eliminating the need to restructure components when sharing behavior.

The Vue CLI and Vite-based scaffolding tool (create-vue) set up a production-ready project with routing, state management, and build optimization in a single command. This eliminates hours of boilerplate configuration.

How to use

1. Create a new Vue project:

npm create vue@latest my-app
cd my-app
npm install
npm run dev

1. Edit src/App.vue to build your interface:

<script setup>
import { ref } from 'vue'
const count = ref(0)
</script>

<template>
  <button @click="count++">Count: {{ count }}</button>
</template>

1. Build for production:

npm run build

Example

<script setup lang="ts">
import { ref, computed } from 'vue'

interface Todo {
  id: number
  text: string
  done: boolean
}

const todos = ref<Todo[]>([
  { id: 1, text: 'Learn Vue 3', done: false },
  { id: 2, text: 'Build an app', done: false }
])

const remaining = computed(() =>
  todos.value.filter(t => !t.done).length
)

function toggle(todo: Todo) {
  todo.done = !todo.done
}
</script>

<template>
  <h2>Todos ({{ remaining }} remaining)</h2>
  <ul>
    <li v-for="todo in todos" :key="todo.id">
      <input type="checkbox" :checked="todo.done" @change="toggle(todo)" />
      {{ todo.text }}
    </li>
  </ul>
</template>

This demonstrates Vue's reactivity system, computed properties, list rendering, and TypeScript integration in a single-file component.

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Common pitfalls

• Mixing Options API and Composition API in the same project creates inconsistency. Pick one style and apply it consistently. The Composition API with <script setup> is the recommended approach for new projects.
• Vue's reactivity system tracks property access. Destructuring reactive objects loses reactivity. Use toRefs() when destructuring props or store state.
• Large Vue applications need code splitting. Without lazy-loaded routes (defineAsyncComponent and dynamic imports), the initial bundle grows large and slows page load.