JWT Explained
Table of Contents
1. Introduction
JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. They are commonly used for authentication and authorization.
2. What Is JWT
A JWT is a string consisting of three parts separated by dots: header, payload, and signature. The header identifies the algorithm used, the payload contains the claims, and the signature verifies the token.
3. How JWT Works
When a user authenticates, the server generates a JWT and sends it to the client. The client then includes this token in subsequent requests to authenticate.
4. JWT Structure
Header: Contains the algorithm type. Payload: Contains claims (user info). Signature: Verifies the token integrity.
5. Security Considerations
Always use HTTPS to transmit JWTs. Store tokens securely on the client side. Consider token expiration and refresh mechanisms.
6. Conclusion
JWT is a powerful tool for authentication in modern web applications. Understanding how it works is essential for building secure applications.
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