---title: 'Async'section: 'Advanced'description: 'Working with promises and Suspense'---
# async
#### Promises
Promises may be values in a proxied object. They will be resolved in calls to `snapshot`.
```jsx// vanillajs exampleconst countDiv: HTMLElement | null = document.getElementById('count')if (countDiv) countDiv.innerText = '0'
const store = proxy({ count: new Promise((r) => setTimeout(() => r(1), 1000)),})
subscribe(store, () => { const value = snapshot(store).count if (countDiv && typeof value === 'number') { countDiv.innerText = String(value) store.count = new Promise((r) => setTimeout(() => r(value + 1), 1000)) }})```
#### Suspend your React components
Valtio supports React Suspense and will throw promises that you access within a components render function. This eliminates all the async back-and-forth, you can access your data directly while the parent is responsible for fallback state and error handling.
```jsxconst state = proxy({ post: fetch(url).then((res) => res.json()) })
function Post() { const snap = useSnapshot(state) return <div>{snap.post.title}</div>}
function App() { return ( <Suspense fallback="Loading..."> <Post /> </Suspense> )}```
## Codesandbox Pokemon fetch demo
https://codesandbox.io/s/valtio-pokemon-fetch-x1lkbj?file=/src/App.tsx
## Codesandbox auth demo
https://codesandbox.io/s/valtio-async-1pstl1?file=/src/App.tsx