---
title: {#await ...}
---
```svelte
<!-- - copy: false - -->
{#await expression}...{:then name}...{:catch name}...{/await}
```
```svelte
<!-- - copy: false - -->
{#await expression}...{:then name}...{/await}
```
```svelte
<!-- - copy: false - -->
{#await expression then name}...{/await}
```
```svelte
<!-- - copy: false - -->
{#await expression catch name}...{/await}
```
Await blocks allow you to branch on the three possible states of a [`Promise` ](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise ) — pending, fulfilled or rejected.
```svelte
{#await promise}
<!-- promise is pending -->
< p > waiting for the promise to resolve...< / p >
{:then value}
<!-- promise was fulfilled or not a Promise -->
< p > The value is {value}< / p >
{:catch error}
<!-- promise was rejected -->
< p > Something went wrong: {error.message}< / p >
{/await}
```
> [!NOTE] During server-side rendering, only the pending branch will be rendered.
>
> If the provided expression is not a `Promise`, only the `:then` branch will be rendered, including during server-side rendering.
The `catch` block can be omitted if you don't need to render anything when the promise rejects (or no error is possible).
```svelte
{#await promise}
<!-- promise is pending -->
< p > waiting for the promise to resolve...< / p >
{:then value}
<!-- promise was fulfilled -->
< p > The value is {value}< / p >
{/await}
```
If you don't care about the pending state, you can also omit the initial block.
```svelte
{#await promise then value}
< p > The value is {value}< / p >
{/await}
```
Similarly, if you only want to show the error state, you can omit the `then` block.
```svelte
{#await promise catch error}
< p > The error is {error}< / p >
{/await}
```
