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You can run a Puppeteer screenshot script in an HTTP-triggered Google Cloud function by deploying a Node.js handler with Puppeteer as a dependency, ensuring Chrome is available in the build, and setting the function’s entry point, region, trigger, memory, and timeout. This guide targets a second-generation Cloud Run function, the current Google Cloud functions experience; check the deployment and runtime documentation for current generation-specific options before deploying.
What you need to decide before deploying
- Function generation and runtime: Google’s current functions documentation uses the Cloud Run functions name, while first-generation functions and the
gcloud functionscommand remain relevant. Runtime availability changes; check Google’s runtime support table and select a supported Node.js runtime for your generation. - Screenshot delivery: This example returns a PNG in the HTTP response. For larger screenshots, repeated retrieval, or asynchronous jobs, store the result in a storage service and return a reference instead.
- Endpoint access: The sample is an HTTP function. Decide whether it should be publicly callable or restricted, and configure the trigger and access policy accordingly.
- URL safety: Do not expose an unrestricted screenshot endpoint that fetches arbitrary URLs without an SSRF and abuse-control policy. Validate destinations and restrict access as appropriate for your use case.
Prepare the project and install Puppeteer
The puppeteer package downloads a compatible Chrome for Testing browser during installation. puppeteer-core does not install Chrome; use it only when you will manage the browser executable or connection yourself. For the simplest deployment, this example uses puppeteer.
Create a project directory and add the following files. The Functions Framework supplies the HTTP handler interface expected by the deployment platform.
package.json
{
"name": "puppeteer-screenshot-function",
"version": "1.0.0",
"private": true,
"main": "index.js",
"scripts": {
"start": "functions-framework --target=screenshot"
},
"dependencies": {
"@google-cloud/functions-framework": "^3.0.0",
"puppeteer": "^24.0.0"
}
}These version ranges illustrate the dependency declarations; choose versions that meet your project’s compatibility and reproducibility requirements, and commit the lockfile your package manager generates. The Google deployment documentation is at Deploy a function.
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.puppeteerrc.js
module.exports = {
cacheDirectory: './node_modules/.puppeteer_cache'
};Puppeteer’s Cloud Functions troubleshooting guidance recommends putting the browser cache under node_modules/.puppeteer_cache. This can help when a cached node_modules build does not rerun Puppeteer’s install step. Confirm that your selected build pipeline actually installs Puppeteer’s browser or preserves this cache; a JavaScript dependency alone is not proof that Chrome is present.
Write the HTTP screenshot handler
Save this as index.js. It validates the input, opens a browser, navigates to the requested URL, captures a PNG, and closes Chrome whether the operation succeeds or fails. The deployment entry point must match the exported function name, screenshot.
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const functions = require('@google-cloud/functions-framework');
const puppeteer = require('puppeteer');
functions.http('screenshot', async (req, res) => {
const url = req.query.url || (req.body && req.body.url);
if (typeof url !== 'string' || url.length === 0) {
return res.status(400).json({ error: 'Provide a URL in the url query parameter or JSON body.' });
}
let browser;
try {
const parsed = new URL(url);
if (!['http:', 'https:'].includes(parsed.protocol)) {
return res.status(400).json({ error: 'Only http and https URLs are supported.' });
}
browser = await puppeteer.launch({ headless: true });
const page = await browser.newPage();
await page.goto(parsed.href, { waitUntil: 'networkidle2', timeout: 45000 });
const image = await page.screenshot({ type: 'png', fullPage: true });
res.set('Content-Type', 'image/png');
res.status(200).send(image);
} catch (error) {
console.error('Screenshot failed:', error);
res.status(500).json({ error: 'Screenshot capture failed.' });
} finally {
if (browser) {
await browser.close();
}
}
});networkidle2, the 45-second navigation timeout, and full-page PNG capture are example choices, not universal requirements. Some sites keep network connections open, load content after navigation, or need a selector-based wait; adjust the wait strategy and screenshot options to your script. For sensitive deployments, return a generic error to callers, as above, and keep detailed diagnostics in logs.
Deploy the function
Install and initialize the Google Cloud CLI, select the intended project, and use a supported runtime and region. The command below illustrates a second-generation HTTP function; replace the project, region, and runtime with values valid for your account and current runtime table. Google’s gcloud functions deploy reference documents the available flags and generation-specific behavior.
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gcloud functions deploy screenshot
--gen2
--runtime=nodejs22
--source=.
--entry-point=screenshot
--region=us-central1
--trigger-http
--memory=1GiB
--timeout=120sThe runtime value shown is an example, not a timeless recommendation. Google’s runtime support list retrieved on October 3, 2026 included Node.js 24 for Cloud Run functions and Node.js 22 for both first-generation and Cloud Run functions; check that live table before deploying. The trigger flag makes the function HTTP-triggered; configure public invocation or authentication deliberately rather than assuming a particular access policy.
Set memory and timeout for the workload
Google’s deploy reference states that the default timeout for a new function is 60 seconds and that first-generation functions have a maximum timeout of 540 seconds. Browser startup, navigation, page scripts, and image creation all consume invocation time. Set a timeout that fits representative pages and the selected generation. No single memory minimum is established for Puppeteer screenshots; test the pages and capture dimensions you expect, then adjust resources if the function runs out of memory or fails to start.
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Call the deployed function and handle its output
Once deployment completes, use the URL reported by the CLI. If the function requires authentication, include an authorized identity token; do not make it public solely to simplify a test.
curl -L "FUNCTION_URL?url=https%3A%2F%2Fexample.com" -o screenshot.pngA successful response from this handler has the image/png content type and image bytes in its body. The function does not save a copy elsewhere. For large full-page captures or work that may outlast a synchronous request, persist the image and return a storage reference instead of sending all bytes directly to the caller.
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Troubleshoot deployment and runtime failures
“Could not find Chrome” or browser launch fails
- Inspect build logs to confirm that the
puppeteerdependency installed and its browser download completed. - Check that the project-root
.puppeteerrc.jsis included in the deployed source and that the build process retains the configured cache path. - If your pipeline caches
node_modules, verify that it did not skip Puppeteer’s install step while leaving the browser cache empty. Rebuild with the install step enabled or use a build configuration that preserves the browser download. - If you chose
puppeteer-core, provide and maintain a compatible Chrome executable or supported browser connection yourself.
Build succeeds but the function does not become ready
- Check Cloud Build logs for dependency, packaging, and browser installation errors first.
- Then inspect Cloud Logging for startup health-check errors. Confirm that
--entry-point=screenshotmatches the exported handler. - Look for exceptions, crashes, or long-running work in global scope. Google identifies initialization exceptions, crashes, and timeouts as causes of startup readiness failures; keep browser work inside the request handler.
- If logs indicate resource exhaustion during startup, test with more resources or a longer timeout. The suitable values depend on the workload.
Navigation times out or captures an incomplete page
- Check whether the site is reachable from the function and whether it blocks automated traffic or depends on authentication, cookies, or geolocation.
- Try a wait condition suited to the page: network-idle waits may not finish on sites with persistent connections, while a selector or a deliberate delay may better represent readiness.
- Test the same target with the same viewport and page conditions locally, then compare logs and invocation duration in the deployed function.
The caller receives an error or cannot invoke the function
- A 400 response means the request did not contain a non-empty
urlvalue or used an unsupported protocol. - A 500 response means capture raised an error; inspect Cloud Logging for the underlying detail.
- An authorization failure usually means the caller lacks permission under the function’s access policy. Grant the required identity access or deliberately change the policy after considering exposure risks.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. Instead of packaging Chrome and maintaining a function, send one GET request; the parameter names used by other screenshot APIs also work. See the ScreenshotNeo API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, failed loads, timeouts, and cache hits are not billed. Its MCP server lets AI agents use screenshot tools, and the free plan includes 1,000 screenshots a month without a card; paid plans start at $5 for 3,000 screenshots. Sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Can Google Cloud Functions run headless Chrome?
Yes. Puppeteer’s guidance says the Node.js runtime of Google Cloud Functions has the system packages needed to run Headless Chrome; the browser binary still needs to be installed or managed as described above.
Should I use puppeteer or puppeteer-core?
Use puppeteer when you want its installation process to download a compatible Chrome for Testing browser. Choose puppeteer-core when you will supply or connect to a browser yourself.
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The deployed build may have installed the Node package without running or preserving Puppeteer’s browser installation. Check the build logs, cache directory, and whether your build pipeline skips install scripts.
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