JSON Web Tokens with Go and Vanilla JavaScript: Full-Stack Authentication

Modern web development often relies on heavy frameworks, but understanding the core mechanics of secure authentication is crucial for any developer. Building your own authorization flow from scratch gives you full control over your application's security and performance. This text-based course guides you through the process of implementing secure user authentication without relying on complex external frameworks. You will start with foundational security concepts, comparing server-side sessions with stateless token-based authentication. Step-by-step, you will read through the construction of a Go backend and a vanilla JavaScript frontend, learning how to handle tokens securely in the browser and on the server. You will also explore modern security practices, such as handling token expiration, using refresh tokens, and protecting against common web vulnerabilities. What you'll learn: - Understand the core structure of JSON Web Tokens (JWT) including headers, payloads, and signatures - Build a custom authentication backend using Go's standard library - Manage token storage securely in vanilla JavaScript without framework dependencies - Implement refresh token rotation to keep user sessions secure and seamless - Configure secure HTTP-only cookies and CORS headers to prevent common web attacks - Practice debugging token verification and handling expired credentials gracefully This course begins with essential security definitions and cryptographic concepts before moving into step-by-step code implementations. You will follow a logical progression from setting up your Go server to handling user state in the browser. This course is designed for beginner to intermediate developers who want to understand the mechanics of authentication. No previous experience with JWTs or advanced framework knowledge is required, though a basic understanding of Go and JavaScript is recommended. Start reading today to master secure, lightweight authentication from the ground up.