# getChunkThreadId

# Function: getChunkThreadId()

```ts
function getChunkThreadId(chunk): string | undefined;
```

Defined in: [packages/ai/src/utilities/chunk-ids.ts:18](https://github.com/TanStack/ai/blob/main/packages/ai/src/utilities/chunk-ids.ts#L18)

Thread id on the spec event, or `metadata.tanstack.threadId` after normalize.

## Parameters

### chunk

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

## Returns

`string` \| `undefined`