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Version: 11.x

Set up a tRPC Client

1. Install the tRPC Client library​

Use your preferred package manager to install the @trpc/client library, and also install @trpc/server which contains some required types.

npm install @trpc/server@next @trpc/client@next

2. Import your App Router​

Import your AppRouter type into the client application. This type holds the shape of your entire API.

ts
import type { AppRouter } from '../server/router';
ts
import type { AppRouter } from '../server/router';
tip

By using import type you ensure that the reference will be stripped at compile-time, meaning you don't inadvertently import server-side code into your client. For more information, see the Typescript docs.

3. Initialize the tRPC client​

Create a tRPC client with the createTRPCClient method, and add a links array with a terminating link pointing at your API. To learn more about tRPC links, click here.

client.ts
ts
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from '../path/to/server/trpc';
const client = createTRPCClient<AppRouter>({
  links: [
    httpBatchLink({
      url: 'http://localhost:3000/trpc',
      // You can pass any HTTP headers you wish here
      async headers() {
        return {
          authorization: getAuthCookie(),
        };
      },
    }),
  ],
});
client.ts
ts
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from '../path/to/server/trpc';
const client = createTRPCClient<AppRouter>({
  links: [
    httpBatchLink({
      url: 'http://localhost:3000/trpc',
      // You can pass any HTTP headers you wish here
      async headers() {
        return {
          authorization: getAuthCookie(),
        };
      },
    }),
  ],
});

4. Use the tRPC Client​

Under the hood this creates a typed JavaScript Proxy which allows you to interact with your tRPC API in a fully type-safe way:

client.ts
ts
const bilbo = await client.getUser.query('id_bilbo');
// => { id: 'id_bilbo', name: 'Bilbo' };
const frodo = await client.createUser.mutate({ name: 'Frodo' });
// => { id: 'id_frodo', name: 'Frodo' };
client.ts
ts
const bilbo = await client.getUser.query('id_bilbo');
// => { id: 'id_bilbo', name: 'Bilbo' };
const frodo = await client.createUser.mutate({ name: 'Frodo' });
// => { id: 'id_frodo', name: 'Frodo' };

You're all set!