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# Function: exportSPKI
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â–¸ **exportSPKI**(`key`): `Promise`<`string`\>
Exports a runtime-specific public key representation (KeyObject or CryptoKey) to a PEM-encoded
SPKI string format.
**`example`** Usage
```js
const spkiPem = await jose.exportSPKI(publicKey)
console.log(spkiPem)
```
#### Parameters
| Name | Type | Description |
| :------ | :------ | :------ |
| `key` | [`KeyLike`](../types/types.KeyLike.md) | Key representation to transform to a PEM-encoded SPKI string format. |
#### Returns
`Promise`<`string`\>
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