# Function: exportPKCS8()

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▸ **exportPKCS8**(`key`): [`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)\<`string`\>

Exports a private [CryptoKey](https://developer.mozilla.org/docs/Web/API/CryptoKey) or [KeyObject](https://nodejs.org/api/crypto.html#class-keyobject) to a PEM-encoded PKCS8 string format.

This function is exported (as a named export) from the main `'jose'` module entry point as well
as from its subpath export `'jose/key/export'`.

## Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `key` | [`CryptoKey`](https://developer.mozilla.org/docs/Web/API/CryptoKey) \| [`KeyObject`](../../../types/interfaces/KeyObject.md) | Key to export to a PEM-encoded PKCS8 string format. |

## Returns

[`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)\<`string`\>

## Example

```js
const pkcs8Pem = await jose.exportPKCS8(privateKey)

console.log(pkcs8Pem)
```