tRPC v11 Patterns for Next.js Applications

Purpose

Provide comprehensive tRPC v11 implementation patterns for Next.js 16 applications emphasizing thin routers with command-query separation. Focus on RBAC enforcement, central error mapping, type safety through inference, and proper client/server boundaries.

When To Use This Skill

Router & Procedure Creation:

• Create new tRPC routers for domain entities
• Implement query procedures for data fetching
• Implement mutation procedures for state changes
• Set up public vs protected (RBAC) procedures

Validation & Type Safety:

• Define Zod input schemas with .strict() validation
• Define Zod output schemas for type inference
• Export RouterInputs/RouterOutputs types for UI
• Implement type-safe server callers for RSC