# Function: decodeProtectedHeader()

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▸ **decodeProtectedHeader**(`token`): [`ProtectedHeaderParameters`](../type-aliases/ProtectedHeaderParameters.md)

Decodes the Protected Header of a JWE/JWS/JWT token utilizing any JOSE serialization.

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

## Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `token` | `string` \| `object` | JWE/JWS/JWT token in any JOSE serialization. |

## Returns

[`ProtectedHeaderParameters`](../type-aliases/ProtectedHeaderParameters.md)

## Example

```js
const protectedHeader = jose.decodeProtectedHeader(token)
console.log(protectedHeader)
```