Sanitizing user input in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does sanitizing user input mean in Vue?

Sanitizing user input means cleaning or filtering the data users type in to remove harmful or unwanted parts before using it in your app.

beginner

Why is sanitizing user input important in Vue apps?

It helps prevent security problems like cross-site scripting (XSS), where bad code from users can run and harm your app or users.

beginner

Which Vue directive can help prevent unsafe HTML rendering?

Use the {{ }} double curly braces to display text safely. Avoid using v-html with untrusted input because it renders raw HTML.

intermediate

How can you sanitize user input before displaying it in Vue?

You can use libraries like DOMPurify to clean HTML strings or write simple functions to remove unwanted characters before showing input.

intermediate

What is a simple example of sanitizing input in Vue?

You can trim spaces and remove special characters from a string before using it, for example: input.trim().replace(/[^a-zA-Z0-9 ]/g, '')

What Vue feature helps prevent XSS by default when showing user input?

A Using v-html directive

B Using {{ }} interpolation

C Using v-bind:html

D Using v-on directive

The {{ }} interpolation escapes HTML automatically, preventing unsafe code from running.

Which library is commonly used to sanitize HTML in Vue apps?

A Axios

B Lodash

C DOMPurify

D Moment.js

DOMPurify cleans HTML strings to remove unsafe code before rendering.

What is a risk of using v-html with user input without sanitizing?

A It can cause cross-site scripting (XSS)

B It slows down the app

C It breaks CSS styles

D It disables Vue reactivity

v-html renders raw HTML, so unsafe input can run harmful scripts.

Which of these is NOT a good sanitizing practice?

A Directly inserting user input into v-html without cleaning

B Using trusted libraries to clean HTML

C Escaping HTML special characters

D Removing unwanted characters from input

Directly inserting user input into v-html without cleaning is unsafe.

How can you sanitize a string to allow only letters and numbers in Vue?

A Use input.split(' ')

B Use input.toUpperCase()

C Use input.trim() only

D Use input.replace(/[^a-zA-Z0-9 ]/g, '')

This regex removes all characters except letters, numbers, and spaces.

Explain why sanitizing user input is important in Vue applications and how Vue helps with this by default.

Think about how bad code from users can harm your app and what Vue does automatically.

Describe a simple way to sanitize user input in Vue before displaying it, including any tools or methods you might use.

Consider both built-in Vue features and external helpers.