NestJS Auth Part 3: Roles Decorator, RolesGuard and Seller-Only Routes: E9

A buyer should not be able to create products, and right now ours can. This episode finishes the auth trilogy with role-based access control.

We build the Roles decorator and a RolesGuard powered by Reflector, add the OptionalJwtAuthGuard for routes that personalize when you are logged in but still work when you are not, and stack seller-only guards on product create, update, and the seller listing route.

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