Secure Input Handling: Defending Web Apps from Malicious Data

Every interaction a user has with your application represents a potential security risk if handled incorrectly. Securing user input is the single most critical step in defending your software from modern cyber threats and data breaches. This written course guides you through the foundational principles of secure input handling. You will transition from writing vulnerable code to implementing robust defensive strategies that sanitize, validate, and safely process all incoming data. What you'll learn: Understand core security terminology and the fundamental principles of zero-trust architecture; Identify common vulnerabilities related to untrusted input, such as SQL injection and cross-site scripting; Apply robust input validation techniques using modern allowlist strategies; Sanitize and encode user data safely before displaying or storing it; Implement secure coding best practices to protect APIs and web forms. You will start by exploring essential security concepts and common threat vectors before moving on to practical, step-by-step techniques for sanitizing and validating data in your applications. This course is designed for beginner developers, software engineering students, and anyone interested in web security who wants to build safer applications from scratch, with no prior security experience required. Start reading today to build secure-by-design applications that protect your users and your data.