puppeteer/docs/api/puppeteer.customqueryhandler.md

---
sidebar_label: CustomQueryHandler
---
# CustomQueryHandler interface

Contains two functions `queryOne` and `queryAll` that can be [registered](./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.

**Signature:**

```typescript
export interface CustomQueryHandler 
```

## Properties

|  Property | Modifiers | 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> |