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---
id: default-query-function
title: Default Query Function
ref: docs/framework/react/guides/default-query-function.md
---
[//]: # 'Example'
```ts
// Define a default query function that will receive the query key
const defaultQueryFn: QueryFunction = async ({ queryKey }) => {
const { data } = await axios.get(
`https://jsonplaceholder.typicode.com${queryKey[0]}`,
)
return data
}
// provide the default query function to your app with defaultOptions
const queryClient = new QueryClient({
defaultOptions: {
queries: {
queryFn: defaultQueryFn,
},
},
})
bootstrapApplication(MyAppComponent, {
providers: [provideTanStackQuery(queryClient)],
})
export class PostsComponent {
// All you have to do now is pass a key!
postsQuery = injectQuery<Array<Post>>(() => ({
queryKey: ['/posts'],
}))
// ...
}
export class PostComponent {
// You can even leave out the queryFn and just go straight into options
postQuery = injectQuery<Post>(() => ({
enabled: this.postIdSignal() > 0,
queryKey: [`/posts/${this.postIdSignal()}`],
}))
// ...
}
```
[//]: # 'Example'
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