> ## Documentation Index
> Fetch the complete documentation index at: https://baileys.wiki/llms.txt
> Use this file to discover all available pages before exploring further.

# xmppPreKey

> Function xmppPreKey in the Baileys API.

> **xmppPreKey**(`pair`, `id`): [`BinaryNode`](/api-reference/type-aliases/BinaryNode)

Defined in: [src/Utils/signal.ts:81](https://github.com/WhiskeySockets/Baileys/blob/master/src/Utils/signal.ts#L81)

## Parameters

### pair

[`KeyPair`](/api-reference/type-aliases/KeyPair)

### id

`number`

## Returns

[`BinaryNode`](/api-reference/type-aliases/BinaryNode)