create-cen-app/template/extras/src/server/api/routers/example/base.ts

create an client-engineering-style app

import { z } from "zod";
import { createTRPCRouter, publicProcedure } from "~/server/api/trpc";

export const exampleRouter = createTRPCRouter({
  hello: publicProcedure
    .input(z.object({ text: z.string() }))
    .query(({ input }) => {
      return {
        greeting: `Hello ${input.text}`,
      };
    }),
});