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Wait for an application-owned readiness signal that fires after the React UI state you need is hydrated and ready, then take the screenshot with Puppeteer. A navigation condition such as networkidle2 can help with page loading, but it is not proof that React hydration or later app work is finished.
Why a screenshot can be too early
With server-rendered React, the browser can display HTML before React has attached client-side behavior. That visible page is not necessarily the final interactive state you intend to capture. Data loading, rendering, or other app-specific work may also continue after navigation appears quiet.
React’s hydrateRoot API does not document a general-purpose hydration-completion promise. React describes hydration as attaching component logic to server-generated HTML, and warns that calling root.render before hydration finishes can clear the existing server HTML and switch the root to client rendering. See the React hydrateRoot reference.
Use an app-owned readiness marker
Have the app or test harness expose a marker only after the particular hydrated UI state required by the screenshot is ready. The marker name and the point when it is set are choices for your application; React does not provide a standard marker.
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For example, the app might set window.__APP_HYDRATED__ = true after hydration and any required data or rendering work. Puppeteer can then wait for that exact condition. Tie it to the real lifecycle you need to test: a marker set after an initial render may still be too early if the screenshot depends on later data.
Capture the page with Puppeteer
- Install and launch Puppeteer. The
puppeteerpackage downloads a compatible Chrome during installation. If your environment manages its own browser,puppeteer-coreis the library-only alternative; see the Puppeteer site. - Navigate using a suitable condition. Puppeteer’s screenshot guide demonstrates
page.goto(url, { waitUntil: 'networkidle2' }). Treat this as a navigation condition, not as a React readiness guarantee. - Wait for your app’s signal. Use
page.waitForFunctionto wait until the marker is true. Choose a timeout that makes sense for your app and test environment. - Take the screenshot. Use
page.screenshot()for the page, selecting full-page or viewport capture as appropriate.
Runnable ES module example, assuming the application sets the marker at the correct point:
import puppeteer from 'puppeteer';
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.goto('http://localhost:3000', { waitUntil: 'networkidle2' });
// The app or test harness must set this marker at the real readiness point.
await page.waitForFunction(() => window.__APP_HYDRATED__ === true);
await page.screenshot({ path: 'capture.png', fullPage: true });
} finally {
await browser.close();
}The example assumes your app supplies the marker; it will not become true automatically. Puppeteer documents options including fullPage, clip, type, path, and omitBackground. See the Puppeteer screenshot guide.
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Choose the right wait for the artifact
Whole application state
For a screenshot that depends on several parts of the interface, wait for an app-owned signal that represents the required state. Network quieting alone cannot establish that React has hydrated or that the app has completed its own work.
One component or element
If only one component matters, a locator or selector wait can establish that the target exists and is in a useful state. Puppeteer’s locator guidance includes visibility and stable-bounding-box checks for relevant operations. Those are checks on the element, not proof that the whole app has hydrated. See the page interactions guide.
For the screenshot itself, use an element screenshot rather than capturing the whole page. Puppeteer may scroll an element into view; an element that becomes detached can cause the capture to fail. Make sure the target remains mounted through the screenshot.
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Navigation and network activity
networkidle2 is useful when it fits the page’s loading behavior, but it describes navigation/network activity rather than an application lifecycle contract. A page with ongoing requests may not reach the condition as expected, while a quiet network does not prove that the interface is in the precise state you want. Combine a navigation condition with the app’s readiness signal when both are needed.
Set the screenshot options deliberately
- Full page: Set
fullPage: trueto capture the full document rather than only the current viewport. - Specific region: Use
clipwhen you need a defined rectangle, or capture a specific element when the target is a component. - Format and destination: Choose
typeandpathto match the required output. Puppeteer’s screenshot documentation lists the supported options for the installed version. - Transparent background: Use
omitBackgroundwhen the desired artifact should omit the default page background.
Troubleshoot early, missing, or failed captures
The screenshot shows server HTML before the final interface
The capture likely happened before the app reached its required hydrated state. Do not rely on a shorter fixed delay as a guarantee. Set the readiness marker from the app or test harness at the actual point the desired UI is ready, then wait for it.
The readiness wait never resolves
Check that the page really sets the marker, that it sets it on window in the page context, and that it becomes true on the route being captured. If app work can fail, ensure the test reports that failure rather than waiting indefinitely; configure a timeout appropriate to the environment.
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The target element is not found or is not useful yet
Confirm the selector matches the rendered page and wait for the target’s relevant state. Element presence or visibility helps when the deliverable is that element, but it does not replace a whole-app readiness signal when other content also matters.
The element screenshot fails after the wait
The app may have removed or replaced the element between the wait and capture. Keep the target mounted through the screenshot, and reacquire it if the app rerenders. Puppeteer documents that a detached element causes an error.
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Use puppeteer when its installation-managed Chrome suits the environment. Use puppeteer-core when you manage the browser yourself, and ensure the browser executable and Puppeteer setup are compatible. Puppeteer controls Chrome or Firefox and runs headless by default.
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