Vue Interview Questions

Expect questions on reactivity, Composition vs Options, refs, Pinia, and routing guards. This lesson covers practical patterns, syntax, and mistakes to avoid.

Common Vue Interview Topics

Expect questions on reactivity, Composition vs Options, refs, Pinia, and routing guards.

Answer with tradeoffs and short code sketches.

Q: ref vs reactive?
A: ref wraps any value via .value; reactive proxies objects. Many teams standardize on ref.

Sample Q&A.

Topics

reactivity
composables
v-model
router guards
pinia vs vuex
SSR/Nuxt awareness

Explain dependency tracking.
Describe a composable you wrote.
Discuss prop mutate rules.
Explain navigation guards.

Vue Interview Questions Cheatsheet

Quick reference for patterns covered in this lesson.

Item	Example	Purpose
Reactivity	ref/reactive	Core
SFC	script setup	Modern
Router	guards	Auth
Pinia	stores	State
Perf	computed/lazy	Advanced
TS	props/emits	Typing

Practice Prompts

What does computed cache?
When use watch vs watchEffect?
How does provide/inject differ from Pinia?
Why keys matter in v-for?
How do you type defineEmits?

Common Mistakes

Only memorizing Options API.
Saying Vuex is required in Vue 3.

Key Takeaways

Reactivity reasoning matters most.
Know Composition well.
Pinia is the modern store.
Bring a real project story.

Pro Tip

Prepare a 2-minute story about debugging a lost-reactivity bug.

Short Sample Answers

Why not mutate props?

Props flow downward from the parent ownership. Mutating them breaks one-way data flow; emit events or use v-model instead.

Pinia vs Vuex?

Pinia is the official Vue 3 store with less boilerplate and better TypeScript ergonomics; Vuex remains in many legacy codebases.

When computed vs methods?

Use computed for derived values that depend on reactive state so results are cached until dependencies change.