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To monitor a website with both timing data and visual evidence, run the same browser check on a schedule, record a clearly defined navigation milestone and HTTP status, and save a screenshot from that run with its timestamp and test conditions. A Playwright script can collect the browser data; a separate scheduler and storage system must provide recurring runs, history, and alerting.
Decide what “response time” means for your check
There is no single browser timing that describes every kind of response. Choose the milestone that matches the question you want the check to answer, and label it in your results. Playwright’s navigation API supports three useful milestones:
commit: the browser has received the response and started loading the document. Use it when you care about the initial document response.domcontentloaded: the document’s HTML has been parsed and the DOMContentLoaded event has fired. It does not mean every image or other resource has finished loading.load: the page’s load event has fired. This is later than the other two milestones, but it still does not prove that a particular application interface is ready for a user.
These are different measurements. A result labeled “response time” without its milestone can be misleading, especially when one run measures the document response and another waits for page load. If your important outcome is specific to an application—for example, a dashboard becoming usable—define and measure that application-specific ready condition separately.
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Build a repeatable check
Choose URLs and conditions
Start with representative pages and, where relevant, a user journey that exercises the action whose response matters. Use consistent browser, viewport, location, and network conditions where practical. If any of those change, record the change: a different device or test location can change the measurement without any site regression.
For each run, save at least the run timestamp, URL, selected timing milestone and duration, HTTP status, navigation outcome, errors, and the test configuration. Treat the screenshot as part of that same run’s record, not as an unrelated image.
Install Playwright
The following example uses Node.js and Playwright’s Chromium browser. In a new project, install the package and browser:
npm init -y
npm install playwright
npx playwright install chromiumSave the script below as monitor.mjs. It takes the URL from the TARGET_URL environment variable, uses load as its declared timing milestone, writes one JSON record and one PNG screenshot per run, and returns a nonzero exit status when navigation fails or the main response is an HTTP error.
import { chromium } from 'playwright';
import { mkdir, writeFile } from 'node:fs/promises';
import { performance } from 'node:perf_hooks';
const url = process.env.TARGET_URL;
if (!url) {
throw new Error('Set TARGET_URL to the page to monitor.');
}
const waitUntil = 'load';
const timeoutMs = Number(process.env.NAVIGATION_TIMEOUT_MS || 30000);
const outputDir = process.env.OUTPUT_DIR || './runs';
await mkdir(outputDir, { recursive: true });
const runStartedAt = new Date().toISOString();
const runId = runStartedAt.replaceAll(':', '-');
const errors = [];
let browser;
let navigationMs = null;
let responseStatus = null;
let navigationError = null;
let screenshotPath = null;
try {
browser = await chromium.launch({ headless: true });
const page = await browser.newPage({ viewport: { width: 1365, height: 768 } });
page.on('pageerror', error => errors.push({ type: 'pageerror', message: error.message }));
page.on('requestfailed', request => errors.push({
type: 'requestfailed',
url: request.url(),
error: request.failure()?.errorText || 'Request failed'
}));
const started = performance.now();
try {
const response = await page.goto(url, { waitUntil, timeout: timeoutMs });
navigationMs = Math.round(performance.now() - started);
responseStatus = response?.status() ?? null;
} catch (error) {
navigationMs = Math.round(performance.now() - started);
navigationError = error.message;
}
if (!navigationError) {
screenshotPath = `${outputDir}/${runId}.png`;
await page.screenshot({ path: screenshotPath, fullPage: true });
}
} catch (error) {
navigationError ||= error.message;
} finally {
await browser?.close();
}
const record = {
runStartedAt,
url,
browser: 'Playwright Chromium',
viewport: { width: 1365, height: 768 },
timingMilestone: waitUntil,
navigationMs,
responseStatus,
navigationError,
errors,
screenshotPath
};
await writeFile(`${outputDir}/${runId}.json`, JSON.stringify(record, null, 2));
console.log(JSON.stringify(record, null, 2));
if (navigationError || (responseStatus !== null && responseStatus >= 400)) {
process.exitCode = 1;
}Run it once to confirm the browser can launch and the target is reachable:
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TARGET_URL=https://example.com node monitor.mjsThe script’s navigationMs is elapsed wall-clock time from immediately before page.goto until the selected navigation milestone resolves or times out. It is not an individual server-processing time. The value also includes effects of the browser and test environment, such as network conditions. Use the same conditions when comparing runs.
Check the HTTP status separately
A navigation call can complete for a response with a status such as 404 or 500. A fulfilled page.goto is therefore not proof that the page succeeded. The example records the main document’s response status and treats status codes of 400 or higher as failed checks. Adapt that policy if your site intentionally serves a different status for a monitored route.
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A navigation can also return no main response—for example, in some nonstandard navigation outcomes—so the script records a missing status as null. The status check should not silently turn that into a successful HTTP response.
Capture the screenshot at the right checkpoint
The example captures a full-page PNG after the selected navigation milestone completes. Playwright also supports viewport and selected-element screenshots, PNG, JPEG, and WebP output, and scaling in CSS pixels or device pixels. Choose the scope and scale that are useful for diagnosis and keep them consistent across runs.
- Viewport: useful when the question is what a user sees without scrolling, and usually produces a smaller artifact.
- Selected element: useful when monitoring a specific component rather than the entire page.
- Full page: includes the scrollable page and can help reveal missing sections or layout changes, but may create larger images and is more sensitive to page-length changes.
For a single element, use Playwright’s locator screenshot API, such as await page.locator('main').screenshot({ path: screenshotPath }), in place of the page screenshot. Use a selector that identifies the intended element reliably. If the screenshot should reflect an application-specific ready state, wait for that condition before capturing rather than assuming the load event is sufficient.
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If the goal is visual regression testing rather than just keeping a screenshot with each timing result, Playwright Test’s toHaveScreenshot assertion waits for two consecutive screenshots to match before comparing with its expectation. It also has controls for animation and dynamic content. That assertion belongs to the Playwright test runner; it does not by itself schedule checks, retain a time series, or alert on monitoring failures.
Schedule runs and keep the evidence together
Playwright supplies browser automation and capture APIs, not a continuous monitoring service. You must arrange the recurring run, preserve its output, and decide how failures reach your team.
- Run on a schedule. Use a scheduler or CI system you already operate. For example, a Unix cron entry can run the script every five minutes:
*/5 * * * * cd /opt/site-check && TARGET_URL=https://example.com /usr/bin/node monitor.mjs. Confirm the actual Node.js path, working directory, environment variables, and output permissions on your host before relying on the job. - Prevent overlapping checks. If a run can last longer than the schedule interval, the scheduler may start another run before the first finishes. Configure a lock or choose an interval that accommodates the expected duration.
- Retain related artifacts. Keep each JSON record and screenshot under a shared run identifier or otherwise store a stable link between them. Store them somewhere that survives the runner’s cleanup and is accessible to whoever investigates an alert.
- Compare like with like. Group results by URL, milestone, browser, viewport, and location/configuration. Annotate intentional test-environment changes so they are not mistaken for a site performance regression.
- Define failure and notification rules. Decide which conditions matter—such as navigation timeout, a particular HTTP status, or a sustained timing change—and how your scheduler or monitoring stack will notify someone. The browser APIs do not prescribe a universal alert threshold or storage scheme.
Resource timing is not navigation timing
Playwright’s Request.timing() exposes timing data for an individual resource request. Most values become available when the response arrives; responseEnd is available when that request finishes. These fields can help diagnose a slow image, script, or API request, but they are not interchangeable with the total elapsed time for a page navigation. Record which quantity a graph or alert represents.
Choose between a script and a hosted check
The right choice depends on whether you need to own the browser run or want a managed synthetic check. A screenshot API can handle image capture, but it is not automatically a timing history or scheduler.
| Option | What it can do | What you still need to verify or provide |
|---|---|---|
| ScreenshotNeo screenshot API | Capture a website screenshot or PDF with one GET request. It can remove known consent banners, newsletter popups, and chat widgets before capture; it reports page verdict and billing information in response headers. An MCP server offers screenshot tools to AI agents. | Use a separate timing measurement and schedule/history system if you need recurring response-time monitoring. See ScreenshotNeo. |
| DIY Playwright script | Navigate pages, inspect the main response, collect request timing, and capture screenshots. | You operate the scheduler, browser environment, artifact storage, history, and failure notifications. |
| AWS CloudWatch Synthetics | AWS documents canaries using headless browser frameworks including Playwright, Puppeteer, or Selenium; canaries check availability and latency and can store load-time data and UI screenshots. | Check which runtime and browser behavior are available in your account and region, and verify current pricing, retention, and configuration limits. |
| New Relic Synthetic Monitoring | New Relic documents monitor results with timing details. A scripted browser monitor can take a screenshot on every check when its script calls the screenshot function. | Check which monitor type fits, and how screenshots are enabled, retained, and accessed under your current plan. |
For any hosted monitoring option, compare the timing definition, browser and device control, test locations, schedule, screenshot retention, history, alerting, setup effort, and current cost. Feature fit alone does not establish present-day plan limits or regional availability.
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Or skip the browser setup
If you need the screenshot capture without installing and running a browser yourself, make a GET request to ScreenshotNeo. For a recurring monitor, pair this capture with your own timing measurement and scheduler; the screenshot API is not a time-series monitoring system.
cURL example, with the API options documented at ScreenshotNeo docs:
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The script times out
Check whether the page is genuinely slow, the runner has network access, or the timeout is too short for the selected milestone. A timeout means that the chosen navigation condition did not complete in time; retain it as a failed run rather than recording it as a successful timing. Increasing the timeout can reduce false failures for a slow page, but it also delays detection.
The status is 404 or 500 even though navigation completed
Inspect the recorded HTTP status. A valid HTTP response with an error status is not necessarily a navigation exception. Decide explicitly which status codes count as success for the monitored URL.
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The screenshot is blank or missing
First check whether navigation failed or timed out before the screenshot step. If navigation completed, determine whether the chosen milestone occurs before the content you need is rendered. Wait for a meaningful selector or application-ready condition before capture when necessary, and check page errors and failed requests saved in the run record.
Results vary between runs
Compare the run metadata before attributing a change to the website. Browser, viewport, location, network, and the tested journey can all affect the outcome. Also check whether dynamic page content makes screenshots differ even when the site is operating normally.
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Runs overlap or artifacts disappear
Long runs can outlast the schedule interval, while temporary runner directories may be cleaned up. Use a lock or longer interval to avoid overlapping jobs, and send the JSON and image to storage that persists beyond the run.
Frequently Asked Questions
Should I use the load event as my only measure of website speed?
Only if it matches the question you are trying to answer. A document response, DOM readiness, page load, and an application-specific ready state describe different checkpoints, so name the one you measure.
Can a screenshot prove that a page was fast?
No. The image documents appearance at a checkpoint; it does not measure elapsed time. Keep the screenshot linked to the timing record and its test conditions.
Does Playwright alone provide continuous monitoring and alerts?
No. It provides browser automation and capture capabilities. Recurring execution, retained history, and alert delivery require a scheduler or monitoring system.
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