puppeteer/docs/api/puppeteer.page.evaluate.md

---
sidebar_label: Page.evaluate
---
# Page.evaluate() method

**Signature:**

```typescript
class Page {evaluate<Params extends unknown[], Func extends EvaluateFunc<Params> = EvaluateFunc<Params>>(pageFunction: Func | string, ...args: Params): Promise<Awaited<ReturnType<Func>>>;}
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  pageFunction | Func \| string | a function that is run within the page |
|  args | Params | arguments to be passed to the pageFunction |

**Returns:**

Promise&lt;Awaited&lt;ReturnType&lt;Func&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


```ts
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


```ts
const aHandle = await page.evaluate('1 + 2');
```
To get the best TypeScript experience, you should pass in as the generic the type of `pageFunction`:

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

## Example 3

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

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