Input validation and sanitization in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is input validation in Node.js?

Input validation is the process of checking if the data received from users meets the expected format, type, and rules before processing it.

beginner

Why is input sanitization important?

Input sanitization cleans user input by removing or escaping harmful characters to prevent security issues like injection attacks.

beginner

Name a popular Node.js library used for input validation.

Joi is a popular library that helps define and enforce validation rules for user input in Node.js applications.

intermediate

What is the difference between validation and sanitization?

Validation checks if input is correct and allowed. Sanitization cleans input to remove harmful parts. Both protect the app but serve different roles.

intermediate

How can you prevent SQL injection using input validation and sanitization?

By validating input to allow only expected formats and sanitizing to escape harmful characters, you stop attackers from injecting malicious SQL code.

Which of the following best describes input validation?

A Checking if user input meets expected rules

B Removing harmful characters from input

C Storing user input in a database

D Displaying input on the screen

Input validation means checking if the input is correct and allowed before using it.

What does input sanitization do?

A Validates user identity

B Checks input format

C Encrypts user data

D Cleans input to remove harmful parts

Sanitization cleans input by removing or escaping dangerous characters.

Which Node.js library is commonly used for input validation?

A Joi

B React

C Express

D Lodash

Joi is a popular library to define and check validation rules.

What risk does input sanitization help prevent?

A Memory leaks

B Slow performance

C Injection attacks

D Network errors

Sanitization helps stop injection attacks by cleaning harmful input.

Which is NOT a part of input validation?

A Checking input type

B Escaping harmful characters

C Checking input length

D Checking input format

Escaping harmful characters is part of sanitization, not validation.

Explain the difference between input validation and input sanitization in Node.js.

Think about checking versus cleaning input.

Describe how you would use a library like Joi to validate user input in a Node.js app.

Focus on schema and validation steps.