4. Authentication & Security
Authentication & Session Architecture
Understand login, sessions, tokens, refresh, revocation and the boundary between identity and authorization.
Lesson overview
Authentication establishes identity; authorization determines allowed actions. Sessions, cookies and tokens need expiry, revocation, secure storage and claim validation.
Learning path
Theory → Example → Code → Practice → Quiz → Challenge → Completion
Step 1
Theory
Authentication establishes identity; authorization determines allowed actions. Sessions, cookies and tokens need expiry, revocation, secure storage and claim validation.
Step 2
Example
A browser session can use an HttpOnly, Secure cookie while the server resolves it to a user and then performs resource authorization.
Step 3
Code
typescript
const cookieOptions = {
httpOnly: true,
secure: true,
sameSite: "lax" as const,
path: "/",
};
Step 4
Practice
Review your current application and apply Authentication & Session Architecture. Document the current behavior, one production risk, the change you would make, and how you would verify it.
Step 5
Quiz
1. What is the central production concern in "Authentication & Session Architecture"?
Step 6
Challenge
Design a production-ready implementation for Authentication & Session Architecture. Include failure handling, security considerations, observability, testing and a rollback or recovery path where applicable.
Complete every stage
Work through every step in order, then the lesson will be marked complete.
Each chapter and subtopic has its own public URL under /full-stack-to-production.