# 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.

Define your routes:

```ts
// ~/server/trpc/routes/posts.ts
export const posts = trpc.router()
  .query('list', {
    resolve() {
      // ..
      return []
    }
  })
```

```ts
// ~/server/trpc/routes/users.ts
export const users = trpc.router()
  .query('list', {
    resolve() {
      // ..
      return []
    }
  })
```

```ts
// ~/server/trpc/index.ts
import { users } from './routes/users'
import { posts } from './routes/posts'

export const router = trpc.router()
  .merge('user.', users) // prefix user procedures with "user."
  .merge('post.', posts) // prefix post procedures with "post."
```

and use it like this:

```html
<script setup lang="ts">
const { data: users } = await useAsyncQuery(['user.list'])
const { data: posts } = await useAsyncQuery(['post.list'])
</script>
```