Getting Started
Guides & Concepts
Community Resources
API Reference

Default Query Function

If you find yourself wishing for whatever reason that you could just share the same query function for your entire app and just use query keys to identify what it should fetch, you can do that by providing a default query function to TanStack Query:

// Define a default query function that will receive the query key
const defaultQueryFn = async ({ queryKey }) => {
const { data } = await axios.get(
return data
// provide the default query function to your app with defaultOptions
const queryClient = new QueryClient({
defaultOptions: {
queries: {
queryFn: defaultQueryFn,
function App() {
return (
<QueryClientProvider client={queryClient}>
<YourApp />
// All you have to do now is pass a key!
function Posts() {
const { status, data, error, isFetching } = useQuery({ queryKey: ['/posts'] })
// ...
// You can even leave out the queryFn and just go straight into options
function Post({ postId }) {
const { status, data, error, isFetching } = useQuery({
queryKey: [`/posts/${postId}`],
enabled: !!postId,
// ...

If you ever want to override the default queryFn, you can just provide your own like you normally would.

Want to Skip the Docs?

Fast track your learning and
take the offical React Query course ↗️

Subscribe to Bytes

Your weekly dose of JavaScript news. Delivered every Monday to over 100,000 devs, for free.


No spam. Unsubscribe at any time.