Set up a tRPC Client - Trpc

import TabItem from '@theme/TabItem'; import Tabs from '@theme/Tabs';

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.

import { InstallSnippet } from '@site/src/components/InstallSnippet';

:::tip AI Agents If you use an AI coding agent, install tRPC skills for better code generation:

bash

npx @tanstack/intent@latest install

:::

2. Import your App Router

import ImportAppRouter from '../../partials/_import-approuter.mdx';

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.

// @filename: server.ts
import { initTRPC } from '@trpc/server';
const t = initTRPC.create();
export const appRouter = t.router({});
export type AppRouter = typeof appRouter;

// @filename: client.ts
declare function getAuthCookie(): string;
// ---cut---
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from './server';

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:

// @target: esnext
// @filename: server.ts
import { initTRPC } from '@trpc/server';
import { z } from 'zod';
const t = initTRPC.create();
const appRouter = t.router({
  getUser: t.procedure.input(z.string()).query(({ input }) => ({ id: input, name: 'Bilbo' })),
  createUser: t.procedure.input(z.object({ name: z.string() })).mutation(({ input }) => ({ id: 'id_frodo', ...input })),
});
export type AppRouter = typeof appRouter;

// @filename: client.ts
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from './server';
const client = createTRPCClient<AppRouter>({
  links: [httpBatchLink({ url: 'http://localhost:3000/trpc' })],
});
// ---cut---
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!