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What the workflow does
CDP is a JSON-based protocol for instrumenting and inspecting Chromium-based browsers. Its Page domain provides Page.navigate and Page.captureScreenshot, the two commands at the center of a batch capture. A reliable script adds the work around those commands: starting or connecting to Chrome, choosing when a page is ready, naming output files safely, recording failures, and cleaning up browser resources.
The protocol reference has a frequently changing tip-of-tree version as well as a stable subset, and tip-of-tree is not guaranteed to remain backwards-compatible. Check the protocol supported by the Chrome build you actually automate before depending on parameters or experimental commands. Chrome DevTools Protocol documentation
Run a multi-URL capture with raw CDP
This Node.js example connects to Chrome through chrome-remote-interface. It expects Chrome to be started separately and its remote-debugging endpoint to be available on port 9222. The script creates one tab, visits the URLs in order, waits for the load event, captures each viewport as PNG, and writes an indexed filename so duplicate paths do not overwrite each other.
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1. Start Chrome with remote debugging
Start a separate Chrome process with a remote debugging port. Use an isolated profile directory for automated work, rather than exposing a profile containing your personal signed-in sessions.
google-chrome --headless --remote-debugging-port=9222 --user-data-dir=/tmp/chrome-cdp-profileThe executable name differs by operating system and installation. Chrome documents the --remote-debugging-port=9222 option in its Headless guide; the exact launch mechanism and process cleanup are your responsibility when using this lower-level library. Chrome Headless documentation
2. Install the Node dependency
In a working directory, initialize a Node project if needed, then install chrome-remote-interface:
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npm init -y
npm install chrome-remote-interfaceSave the following as capture.mjs. It accepts URLs as command-line arguments, writes PNG screenshots to screenshots/, and reports individual navigation or capture failures without silently treating them as successful images.
import CDP from 'chrome-remote-interface';
import fs from 'node:fs/promises';
import path from 'node:path';
const urls = process.argv.slice(2);
if (urls.length === 0) {
console.error('Usage: node capture.mjs <url> [url ...]');
process.exit(2);
}
// Accept only web URLs. Add a host allowlist as well if these URLs are untrusted.
for (const value of urls) {
let parsed;
try {
parsed = new URL(value);
} catch {
throw new Error(`Invalid URL: ${value}`);
}
if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
throw new Error(`Only http and https URLs are allowed: ${value}`);
}
}
const outputDir = path.resolve('screenshots');
await fs.mkdir(outputDir, { recursive: true });
let client;
let targetId;
const failures = [];
try {
// Create a fresh tab on the already-running Chrome instance.
const target = await CDP.New('about:blank');
targetId = target.id;
client = await CDP({ target: targetId });
const { Page } = client;
await Page.enable();
for (let i = 0; i < urls.length; i++) {
const url = urls[i];
const label = String(i + 1).padStart(3, '0');
const pageUrl = new URL(url);
const slug = `${pageUrl.hostname}${pageUrl.pathname}`
.replace(/[^a-z0-9]+/gi, '-')
.replace(/^-+|-+$/g, '')
.slice(0, 70) || 'page';
const file = path.join(outputDir, `${label}-${slug}.png`);
try {
// Install the event listener before navigation to avoid missing a fast load.
const loaded = new Promise((resolve) => {
Page.loadEventFired(() => resolve());
});
await Page.navigate({ url });
await loaded;
const { data } = await Page.captureScreenshot({ format: 'png' });
await fs.writeFile(file, Buffer.from(data, 'base64'));
console.log(`Saved ${file}`);
} catch (error) {
failures.push({ url, error: error.message });
console.error(`Failed ${url}: ${error.message}`);
}
}
} finally {
if (client) await client.close();
if (targetId) {
try {
await CDP.Close({ id: targetId });
} catch {
// Chrome may already have closed the target.
}
}
}
if (failures.length) {
console.error(`${failures.length} URL(s) failed.`);
process.exitCode = 1;
}3. Run it
node capture.mjs https://example.com https://developer.chrome.com/docs/chromium/headlessEach screenshot is a viewport capture in the current page dimensions. This example uses Page.loadEventFired as its readiness rule; it does not guarantee that every image, font, animation, or client-rendered component has finished appearing. For a site whose content arrives after the load event, wait for a selector or an application-specific ready signal before calling Page.captureScreenshot.
Choose a readiness condition deliberately
Load event
Page.loadEventFired is useful when the page’s main load event is an adequate threshold. It is an event boundary, not proof that all visually relevant content has settled. The event listener should be registered before navigation so a fast-loading page cannot fire before the script starts waiting.
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Network idle
Puppeteer’s documented screenshot example uses waitUntil: 'networkidle2'. This waits for a network-activity condition, but should not be treated as a universal visual-completeness guarantee; persistent requests and late JavaScript rendering can make the condition unsuitable for some sites. Puppeteer screenshot guide
Selector or application signal
For a page where a specific component matters, wait for that component to exist or become visible, or use an application-provided signal that means the desired content is ready. This is usually more meaningful than a fixed delay. If a capture depends on lazy-loaded images, the script may also need to scroll through the page before capturing and then wait for the images to load.
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Page.captureScreenshot captures the current visible viewport by default. A long document is not automatically included in full. Full-page capture needs additional steps, and the exact protocol options should be checked against the Chrome version in use. Chrome’s Headless CLI guide likewise notes that full-page screenshots involve extra steps.
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The example combines a zero-padded index with a hostname/path slug. The index prevents collisions when two input URLs normalize to the same slug; sanitizing the slug avoids writing arbitrary URL characters directly into a filesystem path. If input URLs can be controlled by someone else, validate both the scheme and permitted hosts before visiting them: a browser automation process makes requests using the network access available to its host.
Alternative approaches
| Approach | Best fit | Trade-off |
|---|---|---|
| Raw CDP | Precise control over protocol commands, events, and browser targets | You handle connection, browser launch, readiness, result handling, and cleanup; tip-of-tree protocol details can change. |
chrome-remote-interface |
Node access close to CDP | Chrome’s guide says the library does not launch Chrome; process management is separate. |
| Puppeteer | A concise Node workflow with browser launch and screenshot helpers | It abstracts CDP details; use its current API documentation and pin compatible versions for repeatable automation. |
| Chrome Headless CLI | A one-off page capture or viewport-size example | The documented --screenshot command writes screenshot.png in the current working directory; a URL loop and distinct filenames still need scripting, and full-page capture needs extra work. |
Chrome describes Puppeteer as a JavaScript library that automates Chrome and Firefox over CDP and WebDriver BiDi. Its screenshot guide demonstrates launching a browser, navigating with a wait condition, saving a screenshot to a path, and closing the browser. Puppeteer documentation Chrome’s Headless guide also describes using chrome-remote-interface for lower-level protocol work. Chrome Headless documentation
Reliability, speed, and cost considerations
- Batch size and concurrency: the example processes URLs sequentially, which is simpler to debug and avoids creating many simultaneous page loads. If you add concurrency, bound it and monitor browser memory and target cleanup.
- Timeouts: a page may never meet the chosen readiness condition. Production scripts should add a timeout for each navigation/wait and record timed-out URLs for retry or review.
- Retries: retry transient failures selectively, not in an unbounded loop. Preserve the failed URL and error in a log so a missing screenshot cannot be mistaken for a successful capture.
- Reproducibility: pin the Node library version and run a known Chrome build; CDP protocol support depends on the browser being automated.
- Cost: local CDP does not impose a per-screenshot service fee, but it uses your compute, browser maintenance, storage, and time to handle failures. Remote hosted browser or screenshot services may price differently.
Troubleshooting common failures
- Cannot connect to Chrome: confirm Chrome started with
--remote-debugging-port=9222, that the port is reachable from the Node process, and that a conflicting process is not already using it. - Screenshot file is missing or zero bytes: check the script’s output directory permissions and whether the capture threw an error; the example prints the destination only after writing succeeds.
- Screenshot shows an incomplete page: replace the load-event wait with the condition that represents readiness for that site, such as a visible selector or application signal.
- Two captures overwrite each other: retain a unique index or another collision-proof identifier in each filename; URL paths alone may normalize to the same slug.
- Protocol method or parameter fails: compare the command against the protocol supported by the installed Chrome version rather than assuming the mutable tip-of-tree reference matches it.
- Chrome remains running after a failure: keep target closure and client disconnection in a
finallypath, and separately stop the Chrome process that your launch mechanism created.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. A single GET request can return a PNG, JPEG, WebP, or PDF. Its screenshot endpoint accepts a URL and capture options; see the API documentation.
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Frequently Asked Questions
Can I use CDP to capture a screenshot for every URL in a text file?
Yes. Read the file into a URL array and pass that array through the same navigation-and-save loop; keep filename uniqueness and per-URL error reporting.
Does a CDP screenshot include the whole page?
Not by default. The sample captures the current viewport; full-page capture requires additional handling.
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