React Query Setup

Alternative: setup without React context (SPA / Vite)

import { QueryClient } from '@tanstack/react-query';
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import { createTRPCOptionsProxy } from '@trpc/tanstack-react-query';
import type { AppRouter } from '../server/router';

export const queryClient = new QueryClient();

const trpcClient = createTRPCClient<AppRouter>({
  links: [httpBatchLink({ url: 'http://localhost:3000/api/trpc' })],
});

export const trpc = createTRPCOptionsProxy<AppRouter>({
  client: trpcClient,
  queryClient,
});

When using the singleton pattern, wrap your app with QueryClientProvider only (no TRPCProvider needed) and import trpc directly instead of calling useTRPC().

Core Patterns

queryOptions -- querying data

import { skipToken, useQuery, useSuspenseQuery } from '@tanstack/react-query';
import { useTRPC } from '../utils/trpc';

function UserList() {
  const trpc = useTRPC();

  // Basic query
  const userQuery = useQuery(trpc.user.byId.queryOptions({ id: '1' }));

  // With TanStack Query options
  const staleQuery = useQuery(
    trpc.user.byId.queryOptions({ id: '1' }, { staleTime: 5000 }),
  );

  // Suspense query
  const { data } = useSuspenseQuery(trpc.user.byId.queryOptions({ id: '1' }));

  // Conditional query with skipToken
  const conditionalQuery = useQuery(
    trpc.user.byId.queryOptions(userId ? { id: userId } : skipToken),
  );

  return <div>{userQuery.data?.name}</div>;
}

mutationOptions -- writing data

import { useMutation, useQueryClient } from '@tanstack/react-query';
import { useTRPC } from '../utils/trpc';

function CreateUser() {
  const trpc = useTRPC();
  const queryClient = useQueryClient();

  const createUser = useMutation(
    trpc.user.create.mutationOptions({
      onSuccess: () => {
        queryClient.invalidateQueries(trpc.user.queryFilter());
      },
    }),
  );

  return (
    <button onClick={() => createUser.mutate({ name: 'Alice' })}>Create</button>
  );
}

Query invalidation and cache manipulation

import { useQueryClient } from '@tanstack/react-query';
import { useTRPC } from '../utils/trpc';

function InvalidationExample() {
  const trpc = useTRPC();
  const queryClient = useQueryClient();

  // Invalidate a specific query
  const invalidateOne = () =>
    queryClient.invalidateQueries(trpc.user.byId.queryFilter({ id: '1' }));

  // Invalidate all queries under a router
  const invalidateAll = () =>
    queryClient.invalidateQueries(trpc.user.queryFilter());

  // Invalidate ALL tRPC queries
  const invalidateEverything = () =>
    queryClient.invalidateQueries({ queryKey: trpc.pathKey() });

  // Read/write cache directly
  const cached = queryClient.getQueryData(trpc.user.byId.queryKey({ id: '1' }));
  queryClient.setQueryData(trpc.user.byId.queryKey({ id: '1' }), {
    id: '1',
    name: 'Updated',
  });
}

infiniteQueryOptions -- paginated data

import { useInfiniteQuery } from '@tanstack/react-query';
import { useTRPC } from '../utils/trpc';

function InfiniteList() {
  const trpc = useTRPC();

  const posts = useInfiniteQuery(
    trpc.post.list.infiniteQueryOptions(
      { limit: 10 },
      {
        getNextPageParam: (lastPage) => lastPage.nextCursor,
      },
    ),
  );

  return (
    <div>
      {posts.data?.pages.flatMap((page) =>
        page.items.map((item) => <div key={item.id}>{item.title}</div>),
      )}
      <button onClick={() => posts.fetchNextPage()}>Load more</button>
    </div>
  );
}

subscriptionOptions -- real-time data

import { useSubscription } from '@trpc/tanstack-react-query';
import { useTRPC } from '../utils/trpc';

function ChatMessages() {
  const trpc = useTRPC();

  const sub = useSubscription(
    trpc.chat.onMessage.subscriptionOptions(
      { channelId: 'general' },
      {
        onData: (message) => {
          console.log('New message:', message);
        },
        onError: (err) => {
          console.error('Subscription error:', err);
        },
      },
    ),
  );

  return (
    <div>
      Status: {sub.status}, Last: {JSON.stringify(sub.data)}
    </div>
  );
}

Type inference

import type { inferRouterInputs, inferRouterOutputs } from '@trpc/server';
import type { inferInput, inferOutput } from '@trpc/tanstack-react-query';
import type { AppRouter } from '../server/router';

// Router-level inference
type Inputs = inferRouterInputs<AppRouter>;
type Outputs = inferRouterOutputs<AppRouter>;
type UserInput = Inputs['user']['byId'];
type UserOutput = Outputs['user']['byId'];

// Procedure-level inference (inside component)
// const trpc = useTRPC();
// type Input = inferInput<typeof trpc.user.byId>;
// type Output = inferOutput<typeof trpc.user.byId>;

Accessing the tRPC client directly

import { useTRPCClient } from '../utils/trpc';

async function DirectCall() {
  const client = useTRPCClient();
  const result = await client.user.byId.query({ id: '1' });
}

Common Mistakes

Using useQuery without the queryOptions factory

Calling useQuery({ queryKey: [...], queryFn: ... }) manually bypasses tRPC's type-safe query key generation and loses autocomplete. Always use the options factory.

// WRONG
useQuery({ queryKey: ['user', id], queryFn: () => fetch(...) });

// CORRECT
const trpc = useTRPC();
useQuery(trpc.user.byId.queryOptions({ id }));

Missing TRPCProvider wrapper

useTRPC() throws "can only be used inside a <TRPCProvider>" if the component tree is not wrapped. Ensure TRPCProvider is mounted above all components that call useTRPC(), typically in your root App component.

Invalidating queries with the classic utils pattern

The new @trpc/tanstack-react-query package does not use utils.invalidate(). Use queryClient.invalidateQueries() with queryFilter() instead.

// WRONG -- classic pattern does not work with new package
utils.post.invalidate();

// CORRECT
const trpc = useTRPC();
const queryClient = useQueryClient();
queryClient.invalidateQueries(trpc.post.queryFilter());

Creating a singleton QueryClient for SSR

In server-rendered apps, a singleton QueryClient leaks data between requests. Always create a new QueryClient per request on the server, and reuse a single instance only in the browser.

// WRONG
const queryClient = new QueryClient(); // shared across requests!

// CORRECT
function getQueryClient() {
  if (typeof window === 'undefined') return makeQueryClient();
  if (!browserQueryClient) browserQueryClient = makeQueryClient();
  return browserQueryClient;
}

See Also

• [client-setup] -- vanilla tRPC client, links, and transport configuration
• [links] -- httpBatchLink, splitLink, and other link types
• [react-query-classic-migration] -- migrating from @trpc/react-query to @trpc/tanstack-react-query
• [nextjs-app-router] -- using this integration with Next.js App Router and RSC