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Vue.js Interview Questions and Answers - 2025

Vue.js Interview Questions and Answers

Vue.js - Advanced Level

1. What is Vuex?

Vuex is a state management pattern and library for Vue.js applications.

It acts as a central store for all the components in an application.

It applies rules to verify that state changes occur in expected way.

When merged with the Vue.js DevTools extension, it gives extra strong features.

2. In vue router, what are navigation guards?

Vue-navigation router's guards protect navigations by diverting or cancelling them.

The three possible techniques to plug into router navigations are listed below.

Global
Per-route
In-component

3. How do you handle errors and exceptions in Vue.js applications?

In Vue.js, the 'errorCaptured' lifecycle hook permits to control errors taking place in a component and its child components.
For application-wide error handling, you can apply global error handlers like 'Vue.config.errorHandler'.

4. How can you install Vue.js in your project?

To install Vue.js in your project, you can follow these steps:

Using CDN: Include Vue.js directly via a CDN link in your HTML file:

Using npm: Install Vue.js via npm (Node Package Manager) for more advanced projects:

Vue CLI Create Project: Create a new Vue project using Vue CLI:

5. Why is it recommended not to use v-if and v-for directives together on the same element in Vue.js?

It is normally not suggested to use 'v-if' and 'v-for' directives unitedly on the similar element in Vue.js due to potential operation outcomes.
Here is why:
Rendering Overhead: When 'v-for' iterates over a list, Vue.js forms a DOM element for each item in the list. If you merge 'v-if' on the same element, Vue.js requisites to analyze the 'v-if' directive for each iteration to choose whether to render that element. This can lead to unneeded calculations and DOM manipulations.

Readability: Uniting 'v-if' and 'v-for' can make the template tougher to read and understand, particularly for developers who are new to the codebase. It can unclear the meant logic of rendering elements based on terms.

6. Give an example to demonstrate how can you use event handlers in Vue.js?

In Vue.js, event handlers are methods that are invoked in response to precise events initiated by user interactions.

These events can comprise things like clicks, key presses, mouse movements, form submissions, and more.

They are defined within the Vue instance and are normally stated in the methods object.

Output

7. Name some websites which are using Vue.js?

Netflix
Adobe
Facebook
Gitlab
Xiaomi
Alibaba

8. Can You Explain the Single File Components in Vue.js?

Single File Components in Vue.js conclude a component's template, logic, and styles in a single ' .vue ' file.

They boost modularity by arranging all features of a component in one place, refining readability.

During build, tools like webpack process these files, allowing innovative features like hot-reloading.

This way refines Vue.js development by supporting component-based architecture.

9. What is $parent property in Vue.js?

In Vue.js, the ' $parent ' property gives direct access for a child component to its direct parent component in a nested structure.

This permits the child to interact with and use methods.

10. What is vue plugin?

Developers can form and add global level features to Vue via Vue plugin.

This can be utilized to add globally available methods to an application.

VueFire, Vue plugin that adds Firebase specific methods and binding to the intact application, is an example of Vue plugin.

11. Discuss the v-cloak directive in Vue.js?

The 'v-cloak' directive in Vue.js hides components until they are compiled, preventing the display of compiled Vue templates on page load.

It assures an effortless user experience by excluding the wavering outcome generated by delayed rendering, utilizing CSS to hide elements as far as Vue processing completes.

12. List out some of the event modifiers in Vue.js?

In Vue.js, event modifiers are directives that can be affixed to the v-on directive to change how events are controlled. Some usually used event modifiers contain: