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---
id: stable-query-client
title: Stable Query Client
---
The QueryClient contains the QueryCache, so you'd only want to create one instance of the QueryClient for the lifecycle of your application - _not_ a new instance on every render.
> Exception: It's allowed to create a new QueryClient inside an async Server Component, because the async function is only called once on the server.
## Rule Details
Examples of **incorrect** code for this rule:
```tsx
/* eslint "@tanstack/query/stable-query-client": "error" */
function App() {
const queryClient = new QueryClient()
return (
<QueryClientProvider client={queryClient}>
<Home />
</QueryClientProvider>
)
}
```
Examples of **correct** code for this rule:
```tsx
function App() {
const [queryClient] = useState(() => new QueryClient())
return (
<QueryClientProvider client={queryClient}>
<Home />
</QueryClientProvider>
)
}
```
```tsx
const queryClient = new QueryClient()
function App() {
return (
<QueryClientProvider client={queryClient}>
<Home />
</QueryClientProvider>
)
}
```
```tsx
async function App() {
const queryClient = new QueryClient()
await queryClient.prefetchQuery(options)
}
```
## Attributes
- [x] ✅ Recommended
- [x] 🔧 Fixable
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