Vue.js Developer interview questions & mock practice
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 with OnJob's free AI mock interview and get instant, specific feedback before the real one.
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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.
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.
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 your AI mock interview.
- 1. What is the difference between the Options API and the Composition API in Vue 3?
- 2. How does Vue's reactivity system work, and what changed between Vue 2 and Vue 3?
- 3. Explain the difference between ref and reactive in the Composition API.
- 4. What are computed properties, and how do they differ from methods and watchers?
- 5. Explain the Vue component lifecycle hooks and when each one runs.
- 6. What is the difference between v-if and v-show, and when would you use each?
- 7. How do you pass data between components — props, emits, provide/inject and slots?
- 8. What is the key attribute in a v-for loop and why does it matter?
- 9. Explain how Pinia or Vuex manages shared state, and when you would reach for it.
- 10. What are scoped slots and what problem do they solve?
- 11. How does Vue Router handle dynamic routes and navigation guards?
- 12. Tell me about a performance issue you fixed in a Vue app and how you diagnosed it.
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.
Practise other roles
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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. Practice all of them with instant AI feedback using OnJob's free mock interview.
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 run a full AI mock interview on OnJob to rehearse out loud and get instant, specific feedback 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 OnJob's Vue.js Developer mock interview free?
Yes. OnJob's AI mock interview is free to start (₹0) and gives you instant feedback on your answers. Pro (₹99/month) adds unlimited interview-prep AI alongside recruiter tracking and unlimited applications.
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