Case Study: RBAC Gates with Next.js Middleware

At The ScoreCard, different user roles see entirely different dashboard surfaces. Admins manage organizations; analysts view KPIs; super users control system modules. The security model had to enforce this before any page rendered.

Middleware as the First Line of Defense

Client-side route guards are UX helpers, not security. Next.js middleware runs on the edge of every matched request, so unauthorized users never receive protected HTML or RSC payloads.

• Defined route groups per role with explicit matcher patterns.
• Validated session tokens and role claims before allowing navigation.
• Redirected unauthenticated users to login with a return URL.
• Returned 403-equivalent redirects for authenticated but unauthorized roles.

Lesson Learned

Keep middleware fast — no heavy DB calls. Cache role resolution in the session or JWT. Slow middleware makes every navigation feel sluggish.