JWT for Authentication
Learn how to implement JWT (JSON Web Token) authentication in web applications. Understand token structure, verification, and best practices.
JSON Web Tokens (JWT) provide a stateless way to handle user authentication in modern web applications.
How JWT Authentication Works
After successful login, the server creates a signed JWT containing user claims. The client stores this token and includes it in subsequent requests for authentication.
JWT Structure
A JWT has three parts: Header (algorithm), Payload (claims), and Signature. The signature ensures the token hasnt been tampered with.
Security Best Practices
Use HTTPS, set appropriate expiration times, store tokens securely (httpOnly cookies), and verify signatures on every request.
Summary
Debug your JWT tokens easily with our free JWT Debugger tool to inspect headers, payloads, and verify token structure.