Merging Routers

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
ts
// @filename: trpc.ts
import { initTRPC } from '@trpc/server';
const t = initTRPC.create();
 
 
export const middleware = t.middleware;
export const router = t.router;
export const publicProcedure = t.procedure;
 
// @filename: routers/_app.ts
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
});
 
export type AppRouter = typeof appRouter;
 
 
// @filename: routers/post.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  create: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation(({ input }) => {
                  
(parameter) input: {
    title: string;
}
      // [...]
    }),
  list: publicProcedure.query(() => {
    // ...
    return [];
  }),
});
 
// @filename: routers/user.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const userRouter = router({
  list: publicProcedure.query(() => {
    // [..]
    return [];
  }),
});
 

server.ts
ts
// @filename: trpc.ts
import { initTRPC } from '@trpc/server';
const t = initTRPC.create();
 
 
export const middleware = t.middleware;
export const router = t.router;
export const publicProcedure = t.procedure;
 
// @filename: routers/_app.ts
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
});
 
export type AppRouter = typeof appRouter;
 
 
// @filename: routers/post.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  create: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation(({ input }) => {
                  
(parameter) input: {
    title: string;
}
      // [...]
    }),
  list: publicProcedure.query(() => {
    // ...
    return [];
  }),
});
 
// @filename: routers/user.ts
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
ts
// @filename: routers/_app.ts
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;
 
// @filename: routers/post.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  postCreate: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation(({ input }) => {
                  
(parameter) input: {
    title: string;
}
      // [...]
    }),
  postList: publicProcedure.query(() => {
    // ...
    return [];
  }),
});
 
 
// @filename: routers/user.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const userRouter = router({
  userList: publicProcedure.query(() => {
    // [..]
    return [];
  }),
});
 

server.ts
ts
// @filename: routers/_app.ts
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;
 
// @filename: routers/post.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const postRouter = router({
  postCreate: publicProcedure
    .input(
      z.object({
        title: z.string(),
      }),
    )
    .mutation(({ input }) => {
                  
(parameter) input: {
    title: string;
}
      // [...]
    }),
  postList: publicProcedure.query(() => {
    // ...
    return [];
  }),
});
 
 
// @filename: routers/user.ts
import { router, publicProcedure } from '../trpc';
import { z } from 'zod';
export const userRouter = router({
  userList: publicProcedure.query(() => {
    // [..]
    return [];
  }),
});