Validation Overview

Data validation is essential in NestJS. It’s a key defense against bugs and malicious intent. In this lesson, we’ll explore the various techniques and tools NestJS provides to validate data, ensuring that our application processes clean and safe data across our app.

Why validation?

Without proper validation, our application might become vulnerable to attacks, like SQL injection, cross-site scripting (XSS), and input validation issues. SQL injection is a security vulnerability where malicious SQL code is injected into an application’s input, potentially giving unauthorized access to a database. XSS is a security vulnerability where an attacker injects malicious scripts into a trusted website, potentially stealing information or performing actions without the user’s consent. Validation issues might allow for unexpected data manipulation.

With strong validation, we can prevent these errors, safeguard against security vulnerabilities, maintain data integrity, and enhance the overall user experience. It’s crucial to implement comprehensive validation measures to ensure the safety and reliability of our application.

Key data validation criteria

We need to consider several criteria in data validation.