# decodeHeader

**Kind:** Function

**Source:** [`src/utils/jwt/jwt.ts`](https://github.com/honojs/hono/blob/main/src/utils/jwt/jwt.ts#L281)

**Part of:** [Utils](subsystem-src-utils)

## Signature

```ts
function decodeHeader(token: string): TokenHeader
```

## Parameters

| Name | Type |
|---|---|
| `token` | `string` |

**Returns:** `TokenHeader`