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 React Query:

// Define a default query function that will receive the query key
const defaultQueryFn = async ({ queryKey }) => {
const { data } = await axios.get(`https://jsonplaceholder.typicode.com${queryKey[0]}`);
return data;
};
// provide the default query function to your app with defaultOptions
const queryClient = new QueryClient({
defaultOptions: {
queries: {
queryFn: defaultQueryFn,
},
},
})
function App() {
return (
<QueryClientProvider client={queryClient}>
<YourApp />
</QueryClientProvider>
)
}
// All you have to do now is pass a key!
function Posts() {
const { status, data, error, isFetching } = useQuery(['/posts'])
// ...
}
// You can even leave out the queryFn and just go straight into options
function Post({ postId }) {
const { status, data, error, isFetching } = useQuery([`/posts/${postId}`], {
enabled: !!postId,
})
// ...
}

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

Was this page helpful?

Resources

Subscribe to our newsletter

The latest TanStack news, articles, and resources, sent to your inbox.

    I won't send you spam.

    Unsubscribe at any time.

    © 2020 Tanner Linsley. All rights reserved.