---
category: State
---

# useAsyncState

Reactive async state. Will not block your setup function and will trigger changes once the promise is ready. The state is a `shallowRef` by default.

## Usage

```ts
import { useAsyncState } from '@vueuse/core';
import axios from 'axios';

const { state, isReady, isLoading } = useAsyncState(
  axios.get('https://jsonplaceholder.typicode.com/todos/1').then((t) => t.data),
  { id: null },
);
```

### Manually trigger the async function

You can also trigger it manually. This is useful when you want to control when the async function is executed.

```vue
<script setup lang="ts">
import { useAsyncState } from '@vueuse/core';

const { state, execute, executeImmediate } = useAsyncState(action, '', { immediate: false });

async function action(event) {
  await new Promise((resolve) => setTimeout(resolve, 500));
  return `${event.target.textContent} clicked!`;
}
</script>

<template>
  <p>State: {{ state }}</p>

  <button class="button" @click="executeImmediate">Execute now</button>

  <button class="ml-2 button" @click="(event) => execute(500, event)">Execute with delay</button>
</template>
```

## Type Declarations

```ts
export interface UseAsyncStateReturnBase<Data, Params extends any[], Shallow extends boolean> {
  state: Shallow extends true ? Ref<Data> : Ref<UnwrapRef<Data>>;
  isReady: Ref<boolean>;
  isLoading: Ref<boolean>;
  error: Ref<unknown>;
  execute: (delay?: number, ...args: Params) => Promise<Data>;
  executeImmediate: (...args: Params) => Promise<Data>;
}
export type UseAsyncStateReturn<
  Data,
  Params extends any[],
  Shallow extends boolean,
> = UseAsyncStateReturnBase<Data, Params, Shallow> &
  PromiseLike<UseAsyncStateReturnBase<Data, Params, Shallow>>;
export interface UseAsyncStateOptions<Shallow extends boolean, D = any> {
  /**
   * Delay for the first execution of the promise when "immediate" is true. In milliseconds.
   *
   * @default 0
   */
  delay?: number;
  /**
   * Execute the promise right after the function is invoked.
   * Will apply the delay if any.
   *
   * When set to false, you will need to execute it manually.
   *
   * @default true
   */
  immediate?: boolean;
  /**
   * Callback when error is caught.
   */
  onError?: (e: unknown) => void;
  /**
   * Callback when success is caught.
   * @param {D} data
   */
  onSuccess?: (data: D) => void;
  /**
   * Sets the state to initialState before executing the promise.
   *
   * This can be useful when calling the execute function more than once (for
   * example, to refresh data). When set to false, the current state remains
   * unchanged until the promise resolves.
   *
   * @default true
   */
  resetOnExecute?: boolean;
  /**
   * Use shallowRef.
   *
   * @default true
   */
  shallow?: Shallow;
  /**
   *
   * An error is thrown when executing the execute function
   *
   * @default false
   */
  throwError?: boolean;
}
/**
 * Reactive async state. Will not block your setup function and will trigger changes once
 * the promise is ready.
 *
 * @see https://vueuse.org/useAsyncState
 * @param promise         The promise / async function to be resolved
 * @param initialState    The initial state, used until the first evaluation finishes
 * @param options
 */
export declare function useAsyncState<
  Data,
  Params extends any[] = any[],
  Shallow extends boolean = true,
>(
  promise: Promise<Data> | ((...args: Params) => Promise<Data>),
  initialState: MaybeRef<Data>,
  options?: UseAsyncStateOptions<Shallow, Data>,
): UseAsyncStateReturn<Data, Params, Shallow>;
```
