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REST to tRPC Migration in NestJS Monorepos
A step-by-step guide to migrating a NestJS REST API to tRPC within a pnpm monorepo shared with a Next.js frontend. Covers replacing NestJS controllers with typed tRPC routers using nestjs-trpc, defining Zod input/output schemas, setting up per-request context, implementing protected middleware for auth, generating the AppRouter type via CLI, and wiring up the Next.js client with fully typed hooks. The key benefit demonstrated is compile-time detection of backend-to-frontend type mismatches, eliminating the need for manually maintained type definitions on the client.