puppeteer/website/versioned_docs/version-10.0.0/puppeteer.customqueryhandler.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [CustomQueryHandler](./puppeteer.customqueryhandler.md)

## CustomQueryHandler interface

Contains two functions `queryOne` and `queryAll` that can be [registered](./puppeteer.puppeteer.registercustomqueryhandler.md) as alternative querying strategies. The functions `queryOne` and `queryAll` are executed in the page context. `queryOne` should take an `Element` and a selector string as argument and return a single `Element` or `null` if no element is found. `queryAll` takes the same arguments but should instead return a `NodeListOf<Element>` or `Array<Element>` with all the elements that match the given query selector.

<b>Signature:</b>

```typescript
export interface CustomQueryHandler 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [queryAll?](./puppeteer.customqueryhandler.queryall.md) | (element: Element \| Document, selector: string) =&gt; Element\[\] \| NodeListOf&lt;Element&gt; | <i>(Optional)</i> |
|  [queryOne?](./puppeteer.customqueryhandler.queryone.md) | (element: Element \| Document, selector: string) =&gt; Element \| null | <i>(Optional)</i> |