Merging Routers (v10)

Writing all API-code in your code in the same file is not a great idea. It's easy to merge routers with other routers.

Merging with child routers

server.ts

import { initTRPC } from '@trpc/server';
const t = initTRPC.create();



export const router = t.router;
export const publicProcedure = t.procedure;

import { router } from '../trpc';
import { z } from 'zod';

import { userRouter } from './user';
import { postRouter } from './post';

const appRouter = router({
  user: userRouter, // put procedures under "user" namespace
  post: postRouter, // put procedures under "post" namespace
});

// You can then access the merged route with
// http://localhost:3000/trpc/<NAMESPACE>.<PROCEDURE>

export type AppRouter = typeof appRouter;


import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  create: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation((opts) => {
      const { input } = opts;
      // [...]
    }),
  list: publicProcedure.query(() => {
    // ...
    return [];
  }),
});

import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const userRouter = router({
  list: publicProcedure.query(() => {
    // [..]
    return [];
  }),
});

Merging with `t.mergeRouters`

If you prefer having all procedures flat in one single namespace, you can instead use t.mergeRouters

server.ts

import { initTRPC } from '@trpc/server';
const t = initTRPC.create();


export const router = t.router;
export const publicProcedure = t.procedure;
export const mergeRouters = t.mergeRouters;

import { router, publicProcedure, mergeRouters } from '../trpc';
import { z } from 'zod';

import { userRouter } from './user';
import { postRouter } from './post';

const appRouter = mergeRouters(userRouter, postRouter)

export type AppRouter = typeof appRouter;

import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  postCreate: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation((opts) => {
      const { input } = opts;
      // [...]
    }),
  postList: publicProcedure.query(() => {
    // ...
    return [];
  }),
});


import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const userRouter = router({
  userList: publicProcedure.query(() => {
    // [..]
    return [];
  }),
});