JWT (JSON Web Token)

JWT (JSON Web Token)

JWT (JSON Web Token) is an advanced authorization and secure communication standard used in many APIs and microservice architectures. We provide full support for JWT to authenticate users and services, manage sessions and differentiate access by role.

JWT tokens are stored on the client side, do not require sessions on the server, and are signed in order to ensure authenticity and protection against counterfeiting.

What JWT contains

Field in token	Destination
sub	User or Service ID
exp	Token Expiration Time
roles/scopes	User roles and permissions
signature	Digitally signed for authentication
custom claims	Any additional data: language, hall ID, currency, etc.

Implementation features

Format: 'header. payload. signature` (в base64)
Signature algorithms: HS256 (symmetric) and RS256 (asymmetric)
Support for refresh tokens and rotation
Working with CORS, mobile, web and server-to-server clients
Ability to store token in cookies, localStorage or headers

Benefits of using JWT

Stateless: no need for a server session
Convenient for mobile, SPA and microservices
Scalability - easily implemented across multiple services
Fast communication between client and API
Flexibility - you can store any data necessary for authorization in the token

Where especially relevant

Mobile and front-end applications
Intraservice Authorization (S2S)
Platforms with more concurrent users
Systems requiring a clear access role model

JWT is a robust and flexible tool for API authorization and security. It provides scalable and secure application operation without depending on the server state.