The Composition API gives you a way to organize component logic by feature instead of by option. It shines when a component grows beyond a handful of concerns.
Start with script setup
<script setup> reduces boilerplate, and composables let you extract reusable logic into plain functions.
const { items, loading, load } = useInfiniteList();When to refactor
Reach for composables when you see the same watch, computed, and lifecycle logic repeated across multiple components.