Ask Claude to Generate tRPC Routers from Your Existing API

If you're moving from REST to tRPC for end-to-end type safety, Claude can convert your existing route handlers into fully typed tRPC procedures.

Read my Express routes in src/routes/ and convert them to tRPC v11 routers.
Use Zod for input validation on every procedure.
Preserve the existing business logic but restructure it as queries and mutations.
Generate the app router that merges all sub-routers.

Claude will read your existing endpoints, infer the input/output shapes, and produce typed tRPC routers:

// src/server/routers/user.ts
import { router, publicProcedure } from "../trpc";
import { z } from "zod";

export const userRouter = router({
  getById: publicProcedure
    .input(z.object({ id: z.string().uuid() }))
    .query(async ({ input }) => {
      return db.user.findUnique({ where: { id: input.id } });
    }),
  update: publicProcedure
    .input(z.object({ id: z.string().uuid(), name: z.string().min(1) }))
    .mutation(async ({ input }) => {
      return db.user.update({ where: { id: input.id }, data: { name: input.name } });
    }),
});

For a gradual migration, ask Claude to convert one route file at a time and keep both versions running side by side.

tRPC gives you type safety from database to browser — Claude handles the tedious conversion so you get there faster.