Junior-Level Vue Questions
What is Vue.js and why would you use it?
Vue.js is a progressive JavaScript framework used to build user interfaces. It’s lightweight, easy to integrate with other libraries, and great for single-page applications.
What are the main features of Vue.js?
Vue offers reactive data binding, component-based architecture, virtual DOM, directives, transitions, and Vue CLI for scaffolding.
Explain the concept of reactivity in Vue.
Reactivity in Vue means when the data changes, the UI updates automatically. Vue tracks dependencies and efficiently re-renders components.
What is the role of the Vue instance?
The Vue instance is the root of every Vue application. It connects the data, template, methods, and lifecycle hooks together.
What are directives in Vue?
Directives are special tokens in the markup that tell Vue to do something with the DOM, like v-if, v-for, or v-model.
What is a Vue component?
A Vue component is a reusable instance with its own name, template, logic, and style. It helps in breaking down large applications into smaller pieces.
What is the Vue lifecycle?
It refers to the different stages a Vue component goes through – from creation, mounting, updating, to destruction – allowing hooks at each phase.
What is the difference between computed properties and methods?
Computed properties are cached based on their dependencies and only re-evaluate when necessary. Methods re-run every time they are called.
What is Vue CLI?
Vue CLI is a command-line interface for scaffolding and managing Vue projects. It supports plugins and helps with configurations like routing and state management.
What is the virtual DOM in Vue?
It’s a lightweight in-memory representation of the real DOM. Vue uses it to make efficient updates when the data changes.
🔹 Mid-Level Vue Questions
What is the difference between props and state in Vue?
Props are used to pass data from parent to child components. State refers to internal data managed within a component.
How does two-way binding work in Vue?
Using v-model, Vue binds the input’s value to a data property and listens for changes, updating both automatically.
What are watchers in Vue?
Watchers observe data properties and run a function when the data changes. Useful for async or complex data watching.
How do you handle events between components?
Child-to-parent communication uses $emit, while parent-to-child is through props. For sibling communication, a shared state or event bus is used.
What are mixins in Vue?
Mixins are a way to reuse component logic. They allow you to share common code across components, though they may cause conflicts.
What is Vuex and why is it used?
Vuex is a state management library for Vue.js. It provides a centralized store to manage shared state across components.
What are slots in Vue?
Slots allow you to pass content from a parent to a child component and render it in specific places.
What is the difference between v-show and v-if?
v-if adds or removes elements from the DOM. v-show only toggles the element’s visibility via CSS.
What are dynamic components in Vue?
Dynamic components allow you to switch between components using .
What are the advantages of Vue over other frameworks like Angular or React?
Vue is simpler to learn, has clear documentation, supports two-way binding, and is lightweight with strong community support.
What is Nuxt.js?
Nuxt.js is a framework built on top of Vue.js that helps in building server-side rendered (SSR) or static websites with ease.
What problems does Nuxt solve?
Nuxt handles routing, SSR, SEO optimization, and folder structure by convention, making app development faster and more organized.
What are the benefits of using Nuxt.js?
SEO-friendly SSR, automatic routing, modular structure, support for static site generation (SSG), and better performance.
What is the difference between Vue and Nuxt?
Vue is the core framework, while Nuxt is a higher-level framework that adds structure and SSR/SSG capabilities.
What is the purpose of the pages directory in Nuxt?
Each file in the pages directory automatically becomes a route. No need to manually define routes.
What is the asyncData function used for?
asyncData fetches data before rendering the page, only available in page components.
What are Nuxt modules?
Modules extend Nuxt’s functionality, such as adding Axios, authentication, or PWA support.
What is server-side rendering (SSR) in Nuxt?
SSR means the HTML is rendered on the server before being sent to the browser, improving SEO and initial load time.
What is the nuxt.config.js file?
This file is the main configuration file for Nuxt applications, where you define plugins, modules, global CSS, middleware, etc.
What is static site generation (SSG) in Nuxt?
Nuxt can pre-render your entire site as static HTML files for improved speed and SEO.
🔹 Mid-Level Nuxt Questions
What is middleware in Nuxt and how is it used?
Middleware lets you define functions that run before rendering a page, useful for authentication, redirection, or logging.
What is the purpose of the store directory in Nuxt?
If the store directory exists, Nuxt sets up Vuex automatically. You can use it to manage app-wide state.
How does Nuxt handle routing?
Nuxt generates the routing configuration based on the pages directory automatically.
What is the head() method in Nuxt?
head() is used to set meta tags and page titles dynamically for better SEO.
What is the difference between asyncData and fetch in Nuxt?
asyncData sets data before the component is created. fetch can be used to fetch data after the component instance is available.
What is the layout system in Nuxt?
Nuxt allows defining layouts (like master templates). Pages can specify which layout to use.
What is the difference between universal and spa mode in Nuxt?
Universal (SSR) mode renders pages on the server. SPA mode is client-side rendering only.
What is the use of the plugins directory in Nuxt?
You use it to register external plugins or initialize libraries before the app starts.
How do you deploy a Nuxt app to production?
You build the app using nuxt build, then run it with nuxt start or deploy it as a static site using nuxt generate.
What are some common performance optimizations in Nuxt?
Lazy loading components, enabling static generation, optimizing images, and using caching strategies.
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