Add a jwt claim to a keycloak token

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adding custom jwt claims to keycloak tokens: a comprehensive guide

this tutorial provides a detailed explanation of how to add custom claims to json web tokens (jwts) issued by keycloak. custom claims allow you to inject application-specific data into the tokens, enabling services consuming the tokens to make authorization and access control decisions based on this information.

**why add custom claims?**

* **authorization:** implement fine-grained authorization rules based on user roles, attributes, or permissions specific to your application. for example, you can embed a user's "company id" or "department" into the token to control access to certain resources.
* **contextual information:** provide downstream services with additional context about the user or the request. this can simplify logic in those services by offloading the data retrieval to keycloak.
* **data integration:** include information relevant to various applications, avoiding the need to fetch the same data repeatedly. this can reduce latency and improve performance.
* **auditing and logging:** the claims can be valuable for auditing purposes, recording who accessed what resources and when.
* **simplified microservice communication:** avoid the need for service-to-service calls just to retrieve basic user information, improving microservice decoupling.

**methods for adding claims**

keycloak offers several ways to add custom claims to tokens:

1. **mappers:** mappers are the most common and recommended approach. they provide a flexible and configurable way to transform user attributes, client roles, or other information into claims. mappers can be added at both the client and realm level.

2. **custom user storage providers:** if you have a custom user storage provider, you can modify it to add claims directly to the `usermodel` during user retrieval. this approach is suitable if you have complete control over user data management.

3. **event listeners/custom authentication flows:** ...

#Keycloak #JWT #performancetesting
Keycloak
JWT claim
token customization
authentication
authorization
identity management
security tokens
user roles
token payload
claim mapping
access control
user attributes
API security
bearer tokens
OpenID Connect

Видео Add a jwt claim to a keycloak token канала CodeGrip