What are the advantages of Vue 3 Composition API over Options API?

Core Advantages of Composition API

1. Better Logic Reuse

Options API relies on Mixins, which cause naming conflicts and unclear origins. Composition API encapsulates logic in Composable functions — clear and testable:

// composables/useCounter.ts
export function useCounter() {
  const count = ref(0)
  const increment = () => count.value++
  return { count, increment }
}

2. Better TypeScript Support

Variables in setup() are directly inferred — no complex type declarations needed.

3. Co-located Logic

Options API scatters related code across data, methods, computed, and watch. Composition API keeps related logic together, making large components easier to maintain.

When to Use Options API?

• Small components and simple pages
• Team familiarity considerations
• Both can be mixed in the same project