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CodeSignal

Secure Input Validation in Web Applications

via CodeSignal

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Overview

This course explores the importance of input validation and its role in web application security. Using TypeScript and Express.js, we will analyze client-side and server-side validation, common bypass techniques, and secure coding practices. The course follows an **offense-defense approach**, where we first explore vulnerabilities before implementing security solutions.

Syllabus

  • Unit 1: Understanding Input Validation and Its Importance
    • Explore Express Application Setup
    • Explore the Registration Component
    • Demonstrate XSS Vulnerability
  • Unit 2: Enhancing User Experience with HTML5 Client-Side Validation
    • HTML5 Form Validation in Action
    • Enhance Input Validation Logic
    • Real-Time Validation in Editor
    • Bypass HTML5 Validation in Register Form
  • Unit 3: Understanding and Mitigating XSS: Client-Side Validation
    • Implementing Input Sanitization with DOMPurify
    • Sanitize Inputs with DOMPurify
    • Configuring DOMPurify for Safe Attribute Allowance
    • Preserve Text, Remove Harmful Tags
  • Unit 4: Securing the Application Against Attacks
    • Bypassing Client-Side Validation with cURL
    • Testing Snippet Creation Endpoints
  • Unit 5: Secure Server-Side Validation with TypeScript
    • Integrate Zod Validation Middleware
    • Validation Middleware Testing Script
    • Secure Your Snippet Endpoints

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