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At some point, writing JavaScript isn’t the challenge—it’s how you structure it, scale it, and reason about it.

Writing JavaScript is only half the journey—getting it live is where things get real.

You're a Java developer. You build applications that solve problems. But is the code you write secure? This program teaches you to think like an attacker so you can code like a defender, finding and fixing vulnerabilities before they ever reach production.

Featuring 15 code-based challenges with unlimited attempts, this hands-on test lets you sharpen your XSS exploitation skills using real tools. Use a built-in JavaScript editor to simulate attacks and reconnaissance techniques such as understanding what Cross-Site Scripting and sandboxing are, exfiltrating data with JavaScript APIs, exploiting various types of XSS, and learning how to exploit different types of data. Each task mirrors real-world exam scenarios, helping you prepare for certification by actively scripting and executing simulated client-side attacks.

Featuring 40 code-based challenges with unlimited attempts, this hands-on test covers JavaScript injection and cookie deserialization attacks. Discover and exploit JavaScript injection vulnerabilities in plugins, trigger payloads, and escalate to a reverse shell. Learn serialization fundamentals, analyze deserialization vulnerabilities in cookies, and explore payload options to achieve remote code execution. Each task mirrors real-world exam scenarios, helping you script and simulate end-to-end attacks.