# Function: flattenedVerify()

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## Call Signature

▸ **flattenedVerify**(`jws`, `key`, `options?`): [`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)\<[`FlattenedVerifyResult`](../../../../types/interfaces/FlattenedVerifyResult.md)\>

Verifies the signature and format of and afterwards decodes the Flattened JWS.

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

### Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `jws` | [`FlattenedJWSInput`](../../../../types/interfaces/FlattenedJWSInput.md) | Flattened JWS. |
| `key` | [`Uint8Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) \| [`CryptoKey`](https://developer.mozilla.org/docs/Web/API/CryptoKey) \| [`JWK`](../../../../types/interfaces/JWK.md) \| [`KeyObject`](../../../../types/interfaces/KeyObject.md) | Key to verify the JWS with. See [Algorithm Key Requirements](https://github.com/panva/jose/issues/210#jws-alg). |
| `options?` | [`VerifyOptions`](../../../../types/interfaces/VerifyOptions.md) | JWS Verify options. |

### Returns

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

### Example

```js
const decoder = new TextDecoder()
const jws = {
  signature:
    'FVVOXwj6kD3DqdfD9yYqfT2W9jv-Nop4kOehp_DeDGNB5dQNSPRvntBY6xH3uxlCxE8na9d_kyhYOcanpDJ0EA',
  payload: 'SXTigJlzIGEgZGFuZ2Vyb3VzIGJ1c2luZXNzLCBGcm9kbywgZ29pbmcgb3V0IHlvdXIgZG9vci4',
  protected: 'eyJhbGciOiJFUzI1NiJ9',
}

const { payload, protectedHeader } = await jose.flattenedVerify(jws, publicKey)

console.log(protectedHeader)
console.log(decoder.decode(payload))
```

## Call Signature

▸ **flattenedVerify**(`jws`, `getKey`, `options?`): [`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)\<[`FlattenedVerifyResult`](../../../../types/interfaces/FlattenedVerifyResult.md) & [`ResolvedKey`](../../../../types/interfaces/ResolvedKey.md)\>

### Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `jws` | [`FlattenedJWSInput`](../../../../types/interfaces/FlattenedJWSInput.md) | Flattened JWS. |
| `getKey` | [`FlattenedVerifyGetKey`](../interfaces/FlattenedVerifyGetKey.md) | Function resolving a key to verify the JWS with. See [Algorithm Key Requirements](https://github.com/panva/jose/issues/210#jws-alg). |
| `options?` | [`VerifyOptions`](../../../../types/interfaces/VerifyOptions.md) | JWS Verify options. |

### Returns

[`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)\<[`FlattenedVerifyResult`](../../../../types/interfaces/FlattenedVerifyResult.md) & [`ResolvedKey`](../../../../types/interfaces/ResolvedKey.md)\>