Node.js FAQ: Top Questions

Structure: Header, payload, signature (e.g., eyJ... ).
Libraries: jsonwebtoken for signing/verifying.
Process: Issue token on login, verify on protected routes.
Use Case: Stateless API authentication.

37. What is JWT authentication in Node.js?

JWT authentication in Node.js uses JSON Web Tokens to securely authenticate users, encoding user data in a token verified by the server.