JSON Web Tokens (JWT)

Stateless authentication where the user’s identity is encoded in a signed token.

Overview

Stateless authentication where the user’s identity is encoded in a signed token.

Code Example

import jwt from "jsonwebtoken";\nconst token = jwt.sign({ userId: 123 }, process.env.JWT_SECRET);\nconst decoded = jwt.verify(token, process.env.JWT_SECRET);

Web Development Context

In modern web development, understanding JSON Web Tokens (JWT) is crucial. Node.js is widely used for building APIs, real-time applications, and microservices. Mastery of this concept allows you to build efficient, scalable, and secure backend systems.

Common Mistakes

• Blocking the event loop with heavy synchronous tasks.
• Exposing secrets in code instead of environment variables.
• Forgetting to handle promise rejections.

Next Steps

To solidify your understanding, review the related references and try out the practice challenges.