# Function: isOctetType()

> 

> **isOctetType**(`input`): input is Uint8Array\<ArrayBuffer\> \| Blob

Defined in: [packages/client/src/links/internals/contentTypes.ts:2](https://github.com/trpc/trpc/blob/7c907acfd8b31929214792e3b8c2ad7a8ac72563/packages/client/src/links/internals/contentTypes.ts#L2)

Whether an input is binary: a `Uint8Array`, `Blob` or `File`.

## Parameters

| Parameter | Type |
| ------ | ------ |
| `input` | `unknown` |

## Returns

input is Uint8Array\<ArrayBuffer\> \| Blob