tRPC Skill

Expert assistance for building type-safe APIs with tRPC.

Capabilities

• Create type-safe procedures and routers
• Implement middleware for auth/validation
• Set up tRPC with Next.js/React
• Handle subscriptions
• Configure error handling
• Build type-safe client hooks

Usage

Invoke this skill when you need to:

• Build end-to-end type-safe APIs
• Integrate with React/Next.js
• Replace REST with type-safe RPC
• Implement real-time features

Patterns

Router Definition

// server/trpc/routers/user.ts
import { z } from 'zod';
import { router, publicProcedure, protectedProcedure } from '../trpc';
import { TRPCError } from '@trpc/server';

export const userRouter = router({
  list: protectedProcedure
    .input(z.object({
      page: z.number().min(1).default(1),
      limit: z.number().min(1).max(100).default(10),
      search: z.string().optional(),
    }))
    .query(async ({ ctx, input }) => {
      const users = await ctx.prisma.user.findMany({
        where: input.search
          ? { name: { contains: input.search } }
          : undefined,
        skip: (input.page - 1) * input.limit,
        take: input.limit,
      });
      return users;
    }),

  byId: protectedProcedure
    .input(z.string())
    .query(async ({ ctx, input }) => {
      const user = await ctx.prisma.user.findUnique({
        where: { id: input },
      });
      if (!user) {
        throw new TRPCError({ code: 'NOT_FOUND' });
      }
      return user;
    }),

  create: protectedProcedure
    .input(z.object({
      name: z.string().min(1),
      email: z.string().email(),
    }))
    .mutation(async ({ ctx, input }) => {
      return ctx.prisma.user.create({ data: input });
    }),
});

React Integration

// In component
const { data, isLoading } = trpc.user.list.useQuery({ page: 1 });
const createUser = trpc.user.create.useMutation();

<button onClick={() => createUser.mutate({ name, email })}>
  Create
</button>

Best Practices

• Use Zod for input validation
• Implement proper middleware
• Leverage type inference
• Handle errors consistently

Target Processes

• t3-stack-development
• nextjs-full-stack
• type-safe-api