JavaScript Cryptography and Secure Data Handling

Security is a non-negotiable part of modern web development, yet implementing cryptographic concepts in JavaScript can feel daunting. Protecting user passwords, securing API communication, and safely handling sensitive data require a solid grasp of foundational security principles. This text-based course guides you through the core concepts of cryptography and practical data protection in JavaScript. You will transition from understanding basic security definitions to reading, analyzing, and writing secure code for real-world applications. What you'll learn: Understand fundamental cryptographic concepts, including symmetric and asymmetric encryption, hashing, and salting; Implement secure password hashing in Node.js using modern, robust algorithms; Generate and verify JSON Web Tokens (JWTs) while adhering to current security best practices; Apply the native Web Crypto API for browser-based cryptographic operations; Configure secure communications and understand how data is protected in transit; Manage sensitive environment variables and secrets safely within your projects. The course begins with essential security terminology and foundational definitions explained in plain English. You will then progress through step-by-step written explanations and practical code snippets, learning how to implement hashing, encryption, and secure token storage in both client-side and server-side environments. This course is designed for beginner-to-intermediate JavaScript developers who want to build secure applications, with no prior background in cryptography required. Start reading today to build safer, more resilient JavaScript applications.