Use element.evaluate(fn) when you already have a Puppeteer ElementHandle: Puppeteer passes that element to your callback as its first argument and returns the callback’s result. Use page.evaluate(fn, element) if you want to run the same page-context computation through the page instead.
Evaluate JavaScript on an existing element
This complete Node.js example finds the page’s first h1, reads its text, and disposes of the handle when it is no longer needed:
const element = await page.$('h1');
if (!element) throw new Error('Heading not found');
try {
const text = await element.evaluate(el => el.textContent);
console.log(text);
} finally {
await element.dispose();
}element.evaluate runs its callback in the browser page context. The handle is supplied as the callback’s first argument; the value returned by the callback is delivered to your Node.js code. Puppeteer returns a promise for that value and waits if the callback itself returns a promise. See the Puppeteer evaluate API.
Choose the evaluation method for the task
| Method | Use it for | Behavior |
|---|---|---|
element.evaluate(fn) |
Computing something from an element handle you already have | The current element is the callback’s first argument. |
page.evaluate(fn, element) |
Running page-level code while passing an existing handle | Puppeteer resolves the handle to its in-page element and supplies it as an argument. |
element.$eval(selector, fn) |
Evaluating against one matching descendant | The first matching descendant is passed as the callback’s first argument. |
element.$$eval(selector, fn) |
Evaluating against matching descendants as a group | An array of matching elements is passed as the callback’s first argument. |
page.$eval(selector, fn) |
Evaluating against the first page-level selector match | Throws if no element matches. |
page.locator(selector) |
Ordinary selection and interaction, such as clicking or filling | The current guide recommends locators for interaction because they wait for the element to be present and in the appropriate state. |
For the selector-scoped methods, the selector is resolved within the current element for element.$eval and element.$$eval. Consult the ElementHandle selector-evaluation API and page interactions guide.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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Evaluate across matching descendants
Use $$eval when the result should be ordinary data, such as an array of titles:
const titles = await section.$$eval('.title', nodes =>
nodes.map(node => node.textContent?.trim() ?? '')
);
console.log(titles);The callback runs in the page, where nodes refers to the matching elements. The returned strings and array are usable in Node.js.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
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Pass data into page-context code
Evaluation callbacks execute in the browser, not in your Node.js lexical scope. A variable declared outside the callback is not automatically available inside it. Pass values explicitly as arguments:
const prefix = 'Title: ';
const title = await page.evaluate(
(el, label) => label + (el.textContent ?? '').trim(),
element,
prefix
);
console.log(title);page.evaluate accepts the callback followed by its arguments. Puppeteer converts supported arguments, including an element handle, for use in the page context. See the Page.evaluate API.
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Return a value or keep a page-object handle
For strings, numbers, arrays, and plain objects that your Node.js code needs, use evaluate. If you need to keep a reference to an in-page object for later browser-side operations, use evaluateHandle. Page.evaluateHandle returns a handle; when the page function returns an element reference, the result can be an ElementHandle. Handles keep their referenced objects from garbage collection until disposed. Dispose explicitly acquired handles when you are done; navigation or destruction of their execution context also disposes them. See the Page.evaluateHandle API.
Common errors and fixes
- No element matched:
page.$returnsnullwhen there is no match, so check the result before callingevaluate.$evalthrows if its selector has no match. Check the selector and whether the page has reached the state where the element exists. - The callback targets the wrong thing:
page.evaluatedoes not implicitly use a selected element. Pass the handle as an argument, or callevaluateon the handle. For a descendant, useelement.$evalorelement.$$eval. - A Node.js variable is undefined in the callback: page-context code does not inherit Node.js variables. Supply required values as evaluation arguments.
- The result is not usable in Node.js: return serializable data when you need a normal value. Use
evaluateHandleonly when you need a browser-object reference. - A handle is no longer valid: dispose handles when finished. A page navigation or destroyed execution context also ends the handle’s lifetime.
- Evaluation is being used for a routine click or fill: prefer
page.locator(selector)for ordinary interaction; use evaluation for custom reads or computations.
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For example, this cURL request saves a WebP capture of Stripe:
Rank #4
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up for the free plan.
Frequently Asked Questions
Does Puppeteer wait for an asynchronous evaluation callback?
Yes. Evaluation methods wait for a promise returned by the page-context callback to resolve.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Which Puppeteer version do these API details describe?
The official reference pages reviewed carry version labels ranging from 25.1.0 to 25.12.0; check the documentation for the version installed in your project if you need version-specific confirmation.
Quick Recap
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