puppeteer/website/versioned_docs/version-10.1.0/puppeteer.page.evaluate.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Page](./puppeteer.page.md) &gt; [evaluate](./puppeteer.page.evaluate.md)

## Page.evaluate() method

<b>Signature:</b>

```typescript
evaluate<T extends EvaluateFn>(pageFunction: T, ...args: SerializableOrJSHandle[]): Promise<UnwrapPromiseLike<EvaluateFnReturnType<T>>>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  pageFunction | T | a function that is run within the page |
|  args | [SerializableOrJSHandle](./puppeteer.serializableorjshandle.md)\[\] | arguments to be passed to the pageFunction |

<b>Returns:</b>

Promise&lt;[UnwrapPromiseLike](./puppeteer.unwrappromiselike.md)&lt;[EvaluateFnReturnType](./puppeteer.evaluatefnreturntype.md)&lt;T&gt;&gt;&gt;

the return value of `pageFunction`.

## Remarks

Evaluates a function in the page's context and returns the result.

If the function passed to `page.evaluteHandle` returns a Promise, the function will wait for the promise to resolve and return its value.

## Example 1


```js
const result = await frame.evaluate(() => {
  return Promise.resolve(8 * 7);
});
console.log(result); // prints "56"

```
You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript):

## Example 2


```
const aHandle = await page.evaluate('1 + 2');

```
To get the best TypeScript experience, you should pass in as the generic the type of `pageFunction`:

```
const aHandle = await page.evaluate<() => number>(() => 2);

```

## Example 3

[ElementHandle](./puppeteer.elementhandle.md) instances (including [JSHandle](./puppeteer.jshandle.md)s) can be passed as arguments to the `pageFunction`:

```
const bodyHandle = await page.$('body');
const html = await page.evaluate(body => body.innerHTML, bodyHandle);
await bodyHandle.dispose();

```