puppeteer/website/versioned_docs/version-21.9.0/api/puppeteer.webworker.evaluatehandle.md

---
sidebar_label: WebWorker.evaluateHandle
---

# WebWorker.evaluateHandle() method

Evaluates a given function in the [worker](./puppeteer.webworker.md).

#### Signature:

```typescript
class WebWorker {
  evaluateHandle<
    Params extends unknown[],
    Func extends EvaluateFunc<Params> = EvaluateFunc<Params>,
  >(
    func: Func | string,
    ...args: Params
  ): Promise<HandleFor<Awaited<ReturnType<Func>>>>;
}
```

## Parameters

| Parameter | Type           | Description                               |
| --------- | -------------- | ----------------------------------------- |
| func      | Func \| string | Function to be evaluated.                 |
| args      | Params         | Arguments to pass into <code>func</code>. |

**Returns:**

Promise&lt;[HandleFor](./puppeteer.handlefor.md)&lt;Awaited&lt;ReturnType&lt;Func&gt;&gt;&gt;&gt;

A [handle](./puppeteer.jshandle.md) to the return value of `func`.

## Remarks

If the given function returns a promise, [evaluate](./puppeteer.webworker.evaluate.md) will wait for the promise to resolve.

In general, you should use [evaluateHandle](./puppeteer.webworker.evaluatehandle.md) if [evaluate](./puppeteer.webworker.evaluate.md) cannot serialize the return value properly or you need a mutable [handle](./puppeteer.jshandle.md) to the return object.