Definition:JWT (JSON Web Token)
JSON Web Token (JWT) is a compact, URL-safe cryptographic token standard (RFC 7519) used for stateless authentication and claims exchange.
Detailed Technical Explanation
Business Perspective
JWTs enable stateless session management across microservices and cloud clusters without querying session databases on every request.
Technical Perspective
JWTs should be stored in HttpOnly, Secure, SameSite cookies to protect against client-side XSS token theft.
Real-World Example
A signed JWT encoding `{ userId: '123', role: 'admin' }` authorizing user actions across API endpoints.
Common Architectural Mistakes
- ✗Storing JWTs in LocalStorage: Exposing JWT access tokens to client JavaScript makes them vulnerable to XSS attacks.
Ecosystem Integration
Frequently Asked Questions
Where should JWT tokens be saved?
Inside HttpOnly, Secure SameSite browser cookies for optimal XSS and CSRF defense.
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