Identifying Security Vulnerabilities in JavaScript and Web Apps

Writing JavaScript that works is one thing, but writing JavaScript that is secure against modern web threats is another. As web applications grow more complex, understanding how vulnerabilities slip into your codebase is essential for any developer. This course guides you through the process of auditing JavaScript code and web architecture to find and fix critical security issues. You will learn to think like an auditor, recognizing risky patterns in both client-side and server-side environments, and replacing them with secure coding practices. What you'll learn: - Understand foundational web security concepts, including the Same-Origin Policy and sandbox environments - Identify common JavaScript vulnerabilities such as Cross-Site Scripting (XSS) and code injection - Analyze third-party dependencies and secure your supply chain against malicious packages - Apply modern defense-in-depth strategies, including Content Security Policy (CSP) and secure cookie handling - Practice reading and auditing code snippets to spot subtle security flaws before they reach production The course begins with essential security terminology and foundational web mechanics. You will then progress through real-world vulnerability patterns, learning how to analyze code, find weaknesses, and implement robust defense strategies. This course is designed for junior developers, aspiring security auditors, and anyone looking to strengthen their JavaScript security foundations. No prior security experience is required, though a basic familiarity with JavaScript is helpful. Start reading today to build safer, more resilient web applications.