JWT

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It is commonly used for authentication and authorization in web applications, allowing stateless verification of user identity through digitally signed or encrypted tokens. JWTs consist of three parts: a header, a payload, and a signature, which together ensure data integrity and authenticity.

Also known as: JSON Web Token, JWT Token, JWT Auth, JWT Authentication, JsonWebToken

Why learn JWT?

Developers should learn JWT when building modern web applications that require secure, stateless authentication, such as single sign-on (SSO) systems, API security, and microservices architectures. It is particularly useful for scenarios where server-side session storage is impractical, as JWTs can be verified without database lookups, reducing server load and improving scalability. However, it's important to implement proper security measures, such as using HTTPS and storing tokens securely, to prevent vulnerabilities like token theft.

Learning Resources

• docs: JWT.io Introduction
• book: Auth0 JWT Handbook
• tutorial: JWT Authentication Tutorial by freeCodeCamp
• video: JWT Explained in 5 Minutes (Video)
• docs: RFC 7519: JSON Web Token