JWT Cross-Domain — Sharing JWTs Across Domains and Microservices

In this tutorial, you will learn about JWT Cross. We cover key concepts, practical examples, and best practices to help you master this topic.

JWT cross-domain sharing enables authentication context to travel across subdomains, Microservices, and trusted third-party services through common JWKS endpoints, audience validation, and federated trust.

What You'll Learn

• Cross-subdomain cookie sharing
• Microservice token propagation
• Third-party JWT federation
• CORS for JWT requests
• Trusted JWKS sharing

Why It Matters

Modern applications span multiple subdomains, microservices, and third-party integrations. Users should authenticate once and their identity should propagate everywhere. DodaTech's platform shares authentication across 20+ subdomains and partner services through federated JWT trust.

flowchart LR
    A["User Login at auth.dodatech.com"] --> B["JWT issued"]
    B --> C["app.dodatech.com
(subdomain cookie)"]
    B --> D["api.dodatech.com
(Authorization header)"]
    B --> E["reports.dodatech.com
(subdomain cookie)"]
    B --> F["partner.example.com
(federated JWT trust)"]

    C --> G["All verify against
auth.dodatech.com/jwks.json"]
    D --> G
    E --> G
    F --> H["Partner validates
via shared JWKS"]

What's Next

Share JWTs with {{< ilink "JWT" "JWT Token Forwarding" }} across microservices, and secure with {{< ilink "JWT" "JWT Audience Validation" }}.