puppeteer/website/versioned_docs/version-10.0.0/puppeteer.page.queryobjects.md
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Co-authored-by: Jack Franklin <jacktfranklin@chromium.org>
2021-08-09 09:57:14 +01:00

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Page](./puppeteer.page.md) &gt; [queryObjects](./puppeteer.page.queryobjects.md)
## Page.queryObjects() method
This method iterates the JavaScript heap and finds all objects with the given prototype.
<b>Signature:</b>
```typescript
queryObjects(prototypeHandle: JSHandle): Promise<JSHandle>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| prototypeHandle | [JSHandle](./puppeteer.jshandle.md) | a handle to the object prototype. |
<b>Returns:</b>
Promise&lt;[JSHandle](./puppeteer.jshandle.md)&gt;
Promise which resolves to a handle to an array of objects with this prototype.
## Remarks
Shortcut for [page.mainFrame().executionContext().queryObjects(prototypeHandle)](./puppeteer.executioncontext.queryobjects.md).
## Example
```js
// Create a Map object
await page.evaluate(() => window.map = new Map());
// Get a handle to the Map object prototype
const mapPrototype = await page.evaluateHandle(() => Map.prototype);
// Query all map instances into an array
const mapInstances = await page.queryObjects(mapPrototype);
// Count amount of map objects in heap
const count = await page.evaluate(maps => maps.length, mapInstances);
await mapInstances.dispose();
await mapPrototype.dispose();
```