Question 1

What is Pinia?

Accepted Answer

The official Vue store library: modular stores with state, getters, actions. Replaces Vuex patterns with simpler APIs and great TS support. Works with Options or Setup stores.

Question 2

Options store vs setup store?

Accepted Answer

Options uses state/getters/actions objects; setup uses Composition API inside defineStore. Setup stores compose naturally with composables. Pick one style per codebase.

Question 3

How do you persist Pinia state?

Accepted Answer

Plugins or manual watch + localStorage; beware sensitive data. Rehydrate carefully on SSR. Version your persisted schema.

Question 4

Why prefer multiple stores over one mega-store?

Accepted Answer

Clear domains, code-splitting, smaller reactivity surfaces. Cross-store calls via actions. Avoid circular dependencies.

Question 5

Getters in Pinia — best practices?

Accepted Answer

Pure derived state from store state; avoid side effects. Similar to Vue computed. Compose getters thoughtfully.

Question 6

Actions async patterns?

Accepted Answer

async actions for API calls; update state after await; handle errors explicitly. Don't duplicate React Query-like caching unless needed—or integrate a query lib.

Question 7

Using stores outside components?

Accepted Answer

Call useXStore() inside active pinia (setup, actions); pass pinia instance outside. Common footgun in router guards—ensure app.use(pinia) ran.

Question 8

Pinia vs provide/inject for shared state?

Accepted Answer

Pinia for app-wide stateful domains with DevTools; provide/inject for localized trees. Don't invent a second global store system.

Question 9

How do store plugins help?

Accepted Answer

Extend stores for logging, persistence, API injection. Keep plugins focused. Document side effects.

Question 10

Lead: state management guidelines with Pinia?

Accepted Answer

Store boundaries by domain, naming conventions, no UI concerns in stores, test actions, SSR rules. Review PRs for prop drilling vs premature store usage.

Pinia Vue.js Interview Questions

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