Input Validation and Sanitization Techniques

Input Validation and Sanitization Techniques

Input validation and sanitization form critical defensive layers against XSS attacks, working alongside output encoding to create comprehensive protection. While output encoding remains the primary defense, properly implemented input validation can stop malicious payloads before they enter your system, reducing the attack surface and providing defense-in-depth. This chapter explores practical techniques for validating and sanitizing user input, covering both basic principles and advanced strategies for handling complex content safely.