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Vue.js Developer interview questions & mock practice

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What interview questions are asked for a Vue.js Developer?

A Vue.js Developer interview in 2026 runs across 4 rounds — javascript fundamentals, vue core round, machine coding, state, routing & culture fit. Below are the most-asked Vue.js Developer interview questions and a focused prep plan. Rehearse every answer out loud with the free timed practice below before the real one.

  • Vue.js
  • JavaScript
  • Composition API
  • Pinia
  • Vue Router
  • CSS
  • REST APIs

Free interview practice · Vue.js Developer

Practise your Vue.js Developer interview now — free

Step through the 12 most-asked Vue.js Developer questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.

Interview rounds

The Vue.js Developer interview process

Vue 3, Composition API, reactivity and the component lifecycle — the front-end interview for product teams and agencies building on the Vue ecosystem across India.

1. JavaScript fundamentals

Core JS, closures, async/await, the event loop and ES6+ features.

2. Vue core round

Reactivity, Composition API vs Options API, lifecycle hooks and directives.

3. Machine coding

Build a small Vue component live — a todo list, search filter or form with validation.

4. State, routing & culture fit

Vuex/Pinia, Vue Router, project deep-dive and team fit.

Most-asked questions

Most-asked Vue.js Developer interview questions

12 of the questions Vue.js Developer candidates are asked most often in India. Practise answering each one out loud in the timed practice above.

  1. 1. What is the difference between the Options API and the Composition API in Vue 3?
  2. 2. How does Vue's reactivity system work, and what changed between Vue 2 and Vue 3?
  3. 3. Explain the difference between ref and reactive in the Composition API.
  4. 4. What are computed properties, and how do they differ from methods and watchers?
  5. 5. Explain the Vue component lifecycle hooks and when each one runs.
  6. 6. What is the difference between v-if and v-show, and when would you use each?
  7. 7. How do you pass data between components — props, emits, provide/inject and slots?
  8. 8. What is the key attribute in a v-for loop and why does it matter?
  9. 9. Explain how Pinia or Vuex manages shared state, and when you would reach for it.
  10. 10. What are scoped slots and what problem do they solve?
  11. 11. How does Vue Router handle dynamic routes and navigation guards?
  12. 12. Tell me about a performance issue you fixed in a Vue app and how you diagnosed it.
How to prepare

How to prepare for your Vue.js Developer interview

Be fluent in the Composition API: ref vs reactive, computed, watch/watchEffect, and why you unwrap refs in templates but not in setup.

Build 2-3 small components from scratch live — a debounced search, a paginated list, and a validated form — without reaching for a UI library.

Know the reactivity caveats cold: array index mutation, adding object keys, and how Vue 3's Proxy-based system fixed Vue 2's limitations.

Understand state management trade-offs: when component state or provide/inject is enough versus when Pinia earns its keep.

Prepare a clear project story on a real Vue feature you shipped, including how you handled performance, routing and testing.

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Interview prep guides

Vue.js Developer interview — FAQs

What questions are asked in a Vue.js Developer interview?

Common Vue.js Developer interview questions include: What is the difference between the Options API and the Composition API in Vue 3? How does Vue's reactivity system work, and what changed between Vue 2 and Vue 3? Explain the difference between ref and reactive in the Composition API. What are computed properties, and how do they differ from methods and watchers? Interviews usually run across 4 rounds — JavaScript fundamentals, Vue core round, Machine coding, State, routing & culture fit. Practise them with the free timed practice on this page.

How many rounds are in a Vue.js Developer interview?

A typical Vue.js Developer interview has 4 rounds: JavaScript fundamentals (Core JS, closures, async/await, the event loop and ES6+ features.); Vue core round (Reactivity, Composition API vs Options API, lifecycle hooks and directives.); Machine coding (Build a small Vue component live — a todo list, search filter or form with validation.); State, routing & culture fit (Vuex/Pinia, Vue Router, project deep-dive and team fit.).

How do I prepare for a Vue.js Developer interview?

To prepare for a Vue.js Developer interview: Be fluent in the Composition API: ref vs reactive, computed, watch/watchEffect, and why you unwrap refs in templates but not in setup. Build 2-3 small components from scratch live — a debounced search, a paginated list, and a validated form — without reaching for a UI library. Know the reactivity caveats cold: array index mutation, adding object keys, and how Vue 3's Proxy-based system fixed Vue 2's limitations. Then rehearse every question out loud with the timed practice on this page before the real thing.

What skills do I need for a Vue.js Developer role?

Core Vue.js Developer skills tested in interviews include Vue.js, JavaScript, Composition API, Pinia, Vue Router, CSS, REST APIs. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Vue.js Developer job.

Is the Vue.js Developer mock interview practice free?

Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.

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