---
category: Browser
---

# useMemory

Reactive Memory Info.

## Usage

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

const { isSupported, memory } = useMemory();
```

## Type Declarations

```ts
/**
 * Performance.memory
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/Performance/memory
 */
export interface MemoryInfo {
  /**
   * The maximum size of the heap, in bytes, that is available to the context.
   */
  readonly jsHeapSizeLimit: number;
  /**
   *  The total allocated heap size, in bytes.
   */
  readonly totalJSHeapSize: number;
  /**
   * The currently active segment of JS heap, in bytes.
   */
  readonly usedJSHeapSize: number;
  [Symbol.toStringTag]: 'MemoryInfo';
}
export interface UseMemoryOptions extends UseIntervalFnOptions {
  interval?: number;
}
/**
 * Reactive Memory Info.
 *
 * @see https://vueuse.org/useMemory
 * @param options
 *
 * @__NO_SIDE_EFFECTS__
 */
export declare function useMemory(options?: UseMemoryOptions): {
  isSupported: ComputedRef<boolean>;
  memory: Ref<MemoryInfo | undefined, MemoryInfo | undefined>;
};
export type UseMemoryReturn = ReturnType<typeof useMemory>;
```