Use await page.evaluate(pageFunction, ...args) to run JavaScript in the browser page and get its result back in Node.js. The callback runs in the page’s context, not your script’s Node.js scope: pass values it needs as arguments, and use evaluateHandle when you need to keep a DOM object by reference.
Run JavaScript in the page with page.evaluate
page.evaluate accepts a function (or a string), runs it in the page, and returns its result to your Puppeteer script. Puppeteer’s API recommends a function because it is easier to debug and works better with TypeScript. If the function returns a Promise, Puppeteer waits for it to resolve. See the Page.evaluate API and the JavaScript execution guide.
const title = await page.evaluate(() => document.title);
console.log(title);The callback’s return value must be transferable back to Node.js as a serializable value. Strings, numbers, booleans, arrays, and ordinary serializable objects are suitable. A DOM node is not returned as a live Node.js DOM object; for example, returning document.body through evaluate does not give your script a usable browser element reference.
Pass Node.js data into the page function
The evaluated callback is serialized and run in the page context. It cannot close over variables or helper functions declared only in your Node.js script. Pass needed values after the callback; Puppeteer supplies them as positional arguments.
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const suffix = ' — inspected';
const label = await page.evaluate(
value => document.title + value,
suffix,
);
console.log(label);Define browser-side logic inside the callback, or pass data explicitly. A JSHandle can also be passed as an argument when the page function needs an object already obtained from the page.
Wait for asynchronous browser-side work
Make the callback async when it needs to await browser-side work. Puppeteer waits for the returned Promise to resolve, but that does not automatically wait for every application-specific condition your page might have.
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const readyState = await page.evaluate(async () => {
await new Promise(resolve => setTimeout(resolve, 100));
return document.readyState;
});
console.log(readyState);Await the outer page.evaluate call as well. If you need to wait until a particular element or application state exists, use an appropriate Puppeteer wait strategy rather than assuming a delay guarantees readiness.
Choose the right evaluation method
| Need | Method | Behavior |
|---|---|---|
| Compute or read a serializable value from the page | page.evaluate |
Runs a function in the page and returns its result, awaiting a returned Promise. Puppeteer API. |
| Keep a page object or DOM element by reference | page.evaluateHandle |
Returns a JSHandle; an element reference is represented by an ElementHandle. Puppeteer API. |
| Run a callback on the first element matching a selector | page.$eval |
Passes the matched element as the callback’s first argument and throws if there is no match. Puppeteer API. |
| Install setup before the page’s own scripts run | page.evaluateOnNewDocument |
Runs after document creation but before page scripts, including on navigation and qualifying child-frame events. Puppeteer API. |
Keep a DOM element with a handle
Use evaluateHandle when later operations need the actual in-page object rather than a serialized copy. The returned handle can be used in a subsequent evaluation; dispose of it when you are done so it no longer retains the page object.
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const body = await page.evaluateHandle(() => document.body);
try {
const html = await body.evaluate(element => element.innerHTML);
console.log(html);
} finally {
await body.dispose();
}A navigation or destruction of the execution context may dispose of handles automatically. The JSHandle API documents handle lifecycle behavior.
Evaluate a callback on one matching element
For a single selector match, $eval avoids writing a separate lookup inside the page callback:
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const text = await page.$eval('h1', element => element.textContent);
console.log(text);It throws if no element matches. If the element may appear later, wait for it with an appropriate Puppeteer wait or locator strategy before using $eval.
Run setup before site scripts
Use evaluateOnNewDocument when code must execute in a newly created document before that document’s scripts. It also applies during navigation and qualifying child-frame attachment or navigation events.
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await page.evaluateOnNewDocument(() => {
// Runs in the new document before its scripts execute.
});Troubleshoot common evaluation errors
- A Node.js variable is undefined in the callback: the callback runs in the page context and cannot access Node.js lexical scope. Pass the value after the callback as an argument.
- A returned DOM node is empty or unusable in Node.js: regular evaluation serializes the result rather than transferring a live DOM object. Use
evaluateHandlefor reference-based work. - The result is missing or still pending: await the
page.evaluatecall. If the callback returns a Promise, Puppeteer waits for its resolution before returning the result. $evalthrows: its selector matched no element at the time it ran. Wait for the relevant element or use a strategy suited to elements that appear asynchronously.- A long-lived page object remains retained: dispose of its handle when finished, unless navigation or context destruction has already disposed of it.
- TypeScript accepts code that fails in the browser: Node-side types do not establish which globals exist in the browser runtime. Verify that the page context provides the APIs your callback uses.
Version note
Puppeteer’s documentation pages are rolling references. The documentation reviewed on October 3, 2026 identified the evaluate, $eval, and evaluateHandle API references as version 25.12.0, the JSHandle reference as 25.9.0, and evaluateOnNewDocument as 25.11.0; the JavaScript execution guide is labeled Next. Check the versioned API docs for behavior matching the Puppeteer version installed in your project.
Or skip the browser setup
If the goal is a screenshot rather than running arbitrary browser-side logic, ScreenshotNeo offers a one-request screenshot API. It is not a replacement for page.evaluate when your code needs to inspect or modify page state.
Quick Recap
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. It removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are never billed. An MCP server lets AI agents take screenshots, and the free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for the free plan.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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