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To capture an infinite-scroll page in Puppeteer, first scroll it in bounded passes to trigger additional content and lazy-loaded images, then check a page-specific stopping condition and image readiness before calling page.screenshot({ fullPage: true }). The fullPage option captures the page’s full height; it does not make an infinite feed load itself or guarantee every image is ready.
Why fullPage: true is not enough
Puppeteer’s Page.screenshot() supports fullPage: true, while fullPage defaults to false. The option controls screenshot dimensions, not the page’s loading behavior. An infinite-scroll site usually appends content only after a scroll event or when a sentinel enters view, and lazy images may not request their files until they approach the viewport. Scroll first; decide when to stop based on the site’s behavior; then capture. See Puppeteer’s screenshot guide and ScreenshotOptions reference.
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A bounded Puppeteer workflow
This CommonJS example scrolls in increments, waits for the page to react, and stops after the document height stays unchanged across several passes or after a safety limit. It then waits for network idle and for currently loaded images to finish decoding before taking the full-page screenshot.
Install Puppeteer with npm install puppeteer, save the code as capture.cjs, and run node capture.cjs https://example.com. Use a page you are authorized to access; authenticated pages may need cookies or another login setup.
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const puppeteer = require('puppeteer');
const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
async function capture(url) {
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
// Pick dimensions appropriate for the target site before navigation.
await page.setViewport({ width: 1365, height: 900, deviceScaleFactor: 1 });
await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 60000 });
const maxPasses = 40;
const stablePassesNeeded = 3;
let stablePasses = 0;
let previousHeight = 0;
for (let pass = 0; pass < maxPasses; pass += 1) {
const heightBefore = await page.evaluate(() => document.documentElement.scrollHeight);
await page.evaluate(() => window.scrollBy(0, Math.max(window.innerHeight * 0.8, 400)));
await sleep(700); // Give scroll-triggered requests a chance to start.
const heightAfter = await page.evaluate(() => document.documentElement.scrollHeight);
if (heightAfter === previousHeight && heightAfter === heightBefore) {
stablePasses += 1;
} else {
stablePasses = 0;
}
previousHeight = heightAfter;
if (stablePasses >= stablePassesNeeded) break;
}
// Return to the top so the final page state is predictable.
await page.evaluate(() => window.scrollTo(0, 0));
// Network idleness is a useful signal, not proof that no more feed items
// can appear or that every off-screen lazy image has been requested.
await page.waitForNetworkIdle({ idleTime: 500, timeout: 15000 }).catch(() => {});
// Wait for images that have actually been requested to complete and decode.
await page.evaluate(async () => {
const images = Array.from(document.images);
await Promise.all(images.map(async (img) => {
if (!img.complete) {
await new Promise((resolve) => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
});
}
if (img.complete && img.naturalWidth > 0 && img.decode) {
await img.decode().catch(() => {});
}
}));
});
await page.screenshot({ path: 'page.png', fullPage: true });
console.log('Saved page.png');
} finally {
await browser.close();
}
}
const url = process.argv[2];
if (!url) {
console.error('Usage: node capture.cjs https://example.com');
process.exit(1);
}
capture(url).catch((error) => {
console.error(error);
process.exitCode = 1;
});The scroll loop is application logic, not a built-in Puppeteer “finish infinite scroll” feature. Its stable-height condition is only a generic fallback: a feed can append items without changing height immediately, replace content at the same height, or load more after a longer delay. If the site exposes a reliable signal—such as a known item count, a “no more results” marker, or a loading indicator becoming hidden—use that condition instead. The loop’s pass limit prevents a never-ending feed from keeping the script alive indefinitely.
Make the stopping condition fit the site
Prefer a meaningful completion signal
For a finite result set, wait until the expected number of cards exists or the site displays its end-of-results state. For example, replace the generic height test with a page-specific selector check using page.locator() or page.waitForSelector(). Puppeteer’s page interactions guide describes locator-based interactions and scrolling; Page.evaluate() runs code in the page context and waits for a returned promise to resolve.
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Use stability checks as a fallback, not a guarantee
Comparing document height over repeated scrolls is useful when there is no completion marker, but choose the number of stable passes and pause duration for the site. A slow API response can make a short quiet period look like completion. If the feed refreshes continuously or is genuinely unbounded, set a maximum pass count, elapsed-time budget, or content boundary such as the first N cards. No final full-page screenshot can include an endless stream.
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Scrolling gives viewport-triggered lazy loaders an opportunity to run; it does not establish that every image on the eventual tall page has been requested. The example waits for images present in the DOM to complete and attempts to decode successful ones. Failed image requests are allowed to settle rather than hanging the capture. For a stricter result, check the specific image selectors or site state that matters and confirm each required image has a nonzero naturalWidth.
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Some sites create image elements only when their cards are appended, use CSS backgrounds instead of <img>, or defer image assignment until another event. Adapt the readiness check to the implementation. A single check at the end cannot wait for elements that have not yet been added, which is why scrolling and content completion must come first.
Network idle, viewport, and screenshot options
page.waitForNetworkIdle() resolves after the network is idle and waits at least the configured idle period; Puppeteer’s options reference gives 500 ms as the default idle time. It can help after scrolling, but network quiet does not mean the page will never append more content on a future scroll, nor does it prove every lazy image has loaded. Long polling or analytics can also prevent an idle condition, so treat a timeout as a signal to inspect the page rather than a reason to wait forever. See Page.waitForNetworkIdle() and WaitForNetworkIdleOptions.
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Set the viewport before navigation when responsive layout or viewport-triggered loading matters. Choose dimensions and device scale factor that match the output you need; there is no universally correct viewport. The screenshot options reference also documents clipping, captureBeyondViewport, and image format options; PNG is the documented default. For a page taller than a practical single image, consider capturing sections or using PDF rather than assuming one image will be suitable.
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- The screenshot contains only the initial content:
fullPagechanges capture size, not feed behavior. Confirm that scroll events are firing and that the page appends cards; use the site’s completion signal if the document height does not reveal progress. - There are blank or missing images: verify that scrolling reaches every relevant region, then wait for the actual image elements or site-specific ready state. A network-idle wait by itself is not an image-readiness guarantee.
- The script stops too soon: increase the per-pass pause or stable-pass count, or replace height stability with a selector/count/end marker. Slow responses and delayed loaders can make generic stability checks premature.
- The script never finishes: feeds may refresh, long-poll, or keep appending content. Keep explicit pass and time limits; do not treat “infinite” as a state with a natural end.
waitForNetworkIdletimes out: the page may maintain ongoing requests. Handle the timeout deliberately and rely on a target-specific completion condition rather than removing all waits.- Navigation times out or shows an incomplete page: inspect whether the URL is reachable from the browser, whether login or consent is required, and whether the site blocks automation. Adjust navigation waiting to the site’s actual load pattern, then verify the content before capture.
Or skip the browser setup
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