Vue has spent years balancing two audiences at once — developers who want React-like flexibility and developers who want a more structured, template-driven framework — and largely succeeded by offering both the Composition API and the Options API as legitimate, coexisting ways to write components.
Vue.js is a progressive UI framework combining a reactive data-binding system, a template-based (or JSX-compatible) component model, and a well-integrated ecosystem (Vue Router, Pinia) for building full applications. Its reactivity system, revamped with Vue 3's Composition API, tracks dependencies automatically, updating the DOM efficiently when reactive state changes.
Why Vue.js Matters (and When to Skip It)
Vue's template syntax stays close to plain HTML with directives layered on top, which many developers find more approachable than JSX, especially coming from a traditional HTML/CSS background. Its reactivity system is also notably intuitive — you mutate reactive state directly, and the framework tracks what needs to update, without the explicit dependency arrays React's hooks require.
Skip Vue if your team or hiring pool is already deeply invested in React specifically — Vue's ecosystem, while mature and well-maintained, is smaller than React's, and switching frameworks needs to be justified by more than developer preference alone for an established team.
Getting Started with Vue.js
npm create vue@latest my-app
cd my-app
npm install
npm run dev
A component using the Composition API:
<script setup>
import { ref, computed } from "vue";
const count = ref(0);
const doubled = computed(() => count.value * 2);
function increment() {
count.value++;
}
</script>
<template>
<button @click="increment">
Count: {{ count }} (doubled: {{ doubled }})
</button>
</template>
Core Vue.js Concepts Every Developer Should Know
ref and reactive create reactive state that the template automatically tracks. ref wraps a value needing .value access in script (unwrapped automatically in templates); reactive wraps an object directly without needing .value — understanding when to use each is one of the first real learning curve points in Vue 3.
computed values automatically recalculate and cache based on their reactive dependencies, similar in spirit to useMemo in React but with automatic dependency tracking rather than an explicit dependency array — Vue's reactivity system tracks what a computed value reads and re-evaluates only when those specific dependencies change.
Single-File Components (.vue files) combine template, script, and scoped styles in one file, a structure Vue popularized that keeps a component's markup, logic, and styling colocated without needing CSS-in-JS.
<style scoped>
button { padding: 0.5rem 1rem; }
</style>
The Composition API (<script setup>) and Options API are both valid, but the Composition API is the modern default for new code — it composes better for shared logic (via composables, Vue's equivalent of React hooks) and scales better in larger components than the Options API's more rigid structure.
Common Vue.js Mistakes and How to Fix Them
Mistake 1: forgetting .value when accessing a ref in script code (outside the template, where it's auto-unwrapped), leading to confusing bugs where you're reading/writing the ref object instead of its value. Fix: remember .value is required in script context; templates unwrap it automatically.
Mistake 2: mutating a reactive object by reassigning it entirely, which breaks reactivity since it replaces the reactive proxy Vue is tracking. Fix: mutate properties on the reactive object directly, or use ref if you need to reassign the whole value.
// breaks reactivity
state = { count: 1 };
// correct
state.count = 1;
Mistake 3: mixing Options API and Composition API inconsistently within the same codebase without a clear convention, making the codebase harder to navigate. Fix: standardize on the Composition API for new code, with a deliberate (not ad hoc) approach to any remaining Options API code.
When Should You Use Vue Instead of React?
Use Vue when your team prefers a more structured, template-based syntax over JSX, values Vue's more approachable learning curve and intuitive reactivity model, or is building on an existing Vue codebase. Use React when you need its larger ecosystem and hiring pool, or are building within an organization already standardized on React tooling and patterns.
Vue.js in Production
Standardize on the Composition API with <script setup> for new components, and extract shared reactive logic into composables rather than duplicating it across components — the same principle as custom hooks in React. Also use Pinia (Vue's current recommended state management library) rather than older patterns like Vuex for new state management needs.
If you're starting a new Vue project today, default to the Composition API and Pinia — that combination represents the current, well-supported way to build Vue applications rather than older patterns still present in documentation and tutorials from earlier Vue versions.