TanStack Query Integration

Important

This integration automates SSR dehydration/hydration and streaming between TanStack Router and TanStack Query. If you haven't read the standard External Data Loading guide, start there.

What you get

Automatic SSR dehydration/hydration of your QueryClient
Streaming of queries that resolve during initial server render to the client
Redirect handling for redirect() thrown from queries/mutations
Optional provider wrapping with QueryClientProvider

Installation

The TanStack query integration is a separate package that you need to install:

npm install -D @tanstack/react-router-ssr-query
# or
pnpm add -D @tanstack/react-router-ssr-query
# or
yarn add -D @tanstack/react-router-ssr-query
# or
bun add -D @tanstack/react-router-ssr-query

npm install -D @tanstack/react-router-ssr-query
# or
pnpm add -D @tanstack/react-router-ssr-query
# or
yarn add -D @tanstack/react-router-ssr-query
# or
bun add -D @tanstack/react-router-ssr-query

Setup

Create your router and wire up the integration. Ensure a fresh QueryClient is created per request in SSR environments.

tsx

// src/router.tsx
import { QueryClient } from '@tanstack/react-query'
import { createRouter } from '@tanstack/react-router'
import { setupRouterSsrQueryIntegration } from '@tanstack/react-router-ssr-query'
import { routeTree } from './routeTree.gen'

export function createAppRouter() {
  const queryClient = new QueryClient()
  const router = createRouter({
    routeTree,
    // optionally expose the QueryClient via router context
    context: { queryClient },
    scrollRestoration: true,
    defaultPreload: 'intent',
  })

  setupRouterSsrQueryIntegration({
    router,
    queryClient,
    // optional:
    // handleRedirects: true,
    // wrapQueryClient: true,
  })

  return router
}

// src/router.tsx
import { QueryClient } from '@tanstack/react-query'
import { createRouter } from '@tanstack/react-router'
import { setupRouterSsrQueryIntegration } from '@tanstack/react-router-ssr-query'
import { routeTree } from './routeTree.gen'

export function createAppRouter() {
  const queryClient = new QueryClient()
  const router = createRouter({
    routeTree,
    // optionally expose the QueryClient via router context
    context: { queryClient },
    scrollRestoration: true,
    defaultPreload: 'intent',
  })

  setupRouterSsrQueryIntegration({
    router,
    queryClient,
    // optional:
    // handleRedirects: true,
    // wrapQueryClient: true,
  })

  return router
}

By default, the integration wraps your router with a QueryClientProvider. If you already provide your own provider, pass wrapQueryClient: false and keep your custom wrapper.

SSR behavior and streaming

During server render, the integration dehydrates initial queries and streams any subsequent queries that resolve while rendering.
On the client, the integration hydrates the initial state, then incrementally hydrates streamed queries.
Queries from useSuspenseQuery or loader prefetches participate in SSR/streaming. Plain useQuery does not execute on the server.

Use in routes

Using useSuspenseQuery vs useQuery

useSuspenseQuery: runs on the server during SSR when its data is required and will be streamed to the client as it resolves.
useQuery: does not execute on the server; it will fetch on the client after hydration. Use this for data that is not required for SSR.

tsx

// Suspense: executes on server and streams
const { data } = useSuspenseQuery(postsQuery)

// Non-suspense: executes only on client
const { data, isLoading } = useQuery(postsQuery)

// Suspense: executes on server and streams
const { data } = useSuspenseQuery(postsQuery)

// Non-suspense: executes only on client
const { data, isLoading } = useQuery(postsQuery)

Preload with a loader and read with a hook

Preload critical data in the route loader to avoid waterfalls and loading flashes, then read it in the component. The integration ensures server-fetched data is dehydrated and streamed to the client during SSR.

tsx

// src/routes/posts.tsx
import { queryOptions, useSuspenseQuery, useQuery } from '@tanstack/react-query'
import { createFileRoute } from '@tanstack/react-router'

const postsQuery = queryOptions({
  queryKey: ['posts'],
  queryFn: () => fetch('/api/posts').then((r) => r.json()),
})

export const Route = createFileRoute('/posts')({
  // Ensure the data is in the cache before render
  loader: ({ context }) => context.queryClient.ensureQueryData(postsQuery),
  component: PostsPage,
})

function PostsPage() {
  // Prefer suspense for best SSR + streaming behavior
  const { data } = useSuspenseQuery(postsQuery)
  return <div>{data.map((p: any) => p.title).join(', ')}</div>
}

// src/routes/posts.tsx
import { queryOptions, useSuspenseQuery, useQuery } from '@tanstack/react-query'
import { createFileRoute } from '@tanstack/react-router'

const postsQuery = queryOptions({
  queryKey: ['posts'],
  queryFn: () => fetch('/api/posts').then((r) => r.json()),
})

export const Route = createFileRoute('/posts')({
  // Ensure the data is in the cache before render
  loader: ({ context }) => context.queryClient.ensureQueryData(postsQuery),
  component: PostsPage,
})

function PostsPage() {
  // Prefer suspense for best SSR + streaming behavior
  const { data } = useSuspenseQuery(postsQuery)
  return <div>{data.map((p: any) => p.title).join(', ')}</div>
}

Prefetching and streaming

You can also prefetch with fetchQuery or ensureQueryData in a loader without consuming the data in a component. If you return the promise directly from the loader, it will be awaited and thus block the SSR request until the query finishes. If you don't await the promise nor return it, the query will be started on the server and will be streamed to the client without blocking the SSR request.

tsx

import { createFileRoute } from '@tanstack/react-router'
import { queryOptions, useQuery } from '@tanstack/react-query'

const userQuery = (id: string) =>
  queryOptions({
    queryKey: ['user', id],
    queryFn: () => fetch(`/api/users/${id}`).then((r) => r.json()),
  })

export const Route = createFileRoute('/user/$id')({
  loader: ({ params }) => {
    // do not await this nor return the promise, just kick off the query to stream it to the client
    context.queryClient.fetchQuery(userQuery(params.id))
  },
})

import { createFileRoute } from '@tanstack/react-router'
import { queryOptions, useQuery } from '@tanstack/react-query'

const userQuery = (id: string) =>
  queryOptions({
    queryKey: ['user', id],
    queryFn: () => fetch(`/api/users/${id}`).then((r) => r.json()),
  })

export const Route = createFileRoute('/user/$id')({
  loader: ({ params }) => {
    // do not await this nor return the promise, just kick off the query to stream it to the client
    context.queryClient.fetchQuery(userQuery(params.id))
  },
})

Redirect handling

If a query or mutation throws a redirect(...), the integration intercepts it on the client and performs a router navigation.

Enabled by default
Disable with handleRedirects: false if you need custom handling

Works with TanStack Start

TanStack Start uses TanStack Router under the hood. The same setup applies, and the integration will stream query results during SSR automatically.