To refresh a webcam snapshot without reloading the page, keep one <img> element and assign it a new image URL on a timer. Add a changing query parameter, such as the current timestamp, so caches do not keep returning the old image. Use setInterval() for a simple fixed schedule; use a recursive setTimeout() loop when each request must finish before the next one begins.
Refresh only the webcam image
This example updates the image every 10 seconds. The page and its other resources stay in place. The first refresh happens after the first 10-second delay; call refreshSnapshot() before starting the timer if you want to request a fresh frame as soon as the script runs.
<img id="webcam" src="/camera/latest.jpg" alt="Latest webcam snapshot" width="640" height="480">
<script>
const image = document.getElementById('webcam');
const baseUrl = '/camera/latest.jpg';
const refreshMs = 10_000;
function refreshSnapshot() {
image.src = `${baseUrl}?t=${Date.now()}`;
}
// Uncomment this line to request a fresh frame immediately.
// refreshSnapshot();
const intervalId = setInterval(refreshSnapshot, refreshMs);
// Call clearInterval(intervalId) when this page or component no longer needs updates.
</script>Replace /camera/latest.jpg with the actual snapshot endpoint. If that URL already has query parameters, append the timestamp with &t= rather than adding a second question mark. For example, /camera/latest.jpg?view=outdoor&t=....
Choose a refresh period the camera can support
The timer controls how often the browser requests an image, not how often the camera publishes a new one. If the camera updates every 30 seconds, polling every 2 seconds mostly downloads duplicate frames. Match the interval to the camera’s publication cadence and the bandwidth you can use. A shorter interval also means more requests to the camera server, proxy, or CDN.
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setInterval() repeatedly invokes its callback after a fixed delay. The delay is not a guarantee that an image will finish downloading in that time. If a request lasts longer than the interval, another request can start while it is still pending. For a responsive endpoint and a simple page this may be acceptable; when overlap is undesirable, use the sequential pattern below.
Prevent overlapping refresh requests
A recursive setTimeout() schedules the next request only after the current fetch has completed. This makes the interval effectively “wait this long after the last request finishes,” rather than “start every fixed number of milliseconds.” It is useful when network time varies or the camera server is slow.
<img id="webcam" src="/camera/latest.jpg" alt="Latest webcam snapshot" width="640" height="480">
<p id="webcam-status" role="status">Loading latest snapshot…</p>
<script>
const image = document.getElementById('webcam');
const status = document.getElementById('webcam-status');
const baseUrl = '/camera/latest.jpg';
const refreshMs = 10_000;
let stopped = false;
let timerId;
let currentObjectUrl;
async function poll() {
try {
const url = `${baseUrl}?t=${Date.now()}`;
const response = await fetch(url, { cache: 'no-cache' });
if (!response.ok) throw new Error(`HTTP ${response.status}`);
const blob = await response.blob();
if (!blob.type.startsWith('image/')) {
throw new Error('The endpoint did not return an image');
}
const nextObjectUrl = URL.createObjectURL(blob);
image.onload = () => {
if (currentObjectUrl) URL.revokeObjectURL(currentObjectUrl);
currentObjectUrl = nextObjectUrl;
status.textContent = `Updated ${new Date().toLocaleTimeString()}`;
};
image.onerror = () => {
URL.revokeObjectURL(nextObjectUrl);
status.textContent = 'Could not display the latest snapshot; showing the previous frame.';
};
image.src = nextObjectUrl;
} catch (error) {
status.textContent = 'Could not load the latest snapshot; showing the previous frame.';
console.error('Webcam snapshot refresh failed:', error);
} finally {
if (!stopped) timerId = setTimeout(poll, refreshMs);
}
}
poll();
// Run this when tearing down the page component.
function stopPolling() {
stopped = true;
clearTimeout(timerId);
if (currentObjectUrl) URL.revokeObjectURL(currentObjectUrl);
}
</script>This pattern fetches the image as a blob and changes the displayed source only after a successful response. That lets a failed request leave the previous good frame visible. The role="status" text communicates the update or failure to assistive technology. If you use a single img.src assignment instead, browsers may replace the displayed frame with a broken-image indicator if the new URL fails.
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When direct image assignment is enough
Use the shorter setInterval() example if the endpoint reliably returns an image and occasional overlapping downloads are not a concern. It has less code and does not need JavaScript to read the response body. Use fetch() when you need to inspect HTTP status, validate the response, preserve the previous frame on failure, or report a useful status message.
The fetch version has a cross-origin constraint: if the camera is on another origin, its server must permit the browser’s cross-origin fetch. An image element can often display a cross-origin image even when JavaScript is not allowed to read its response. If you cannot configure the camera server’s cross-origin policy, route the request through your own server rather than trying to bypass the browser’s security rules.
Why a changed image URL can still show a stale frame
Browsers and intermediary caches may reuse an image response when the URL has not changed. A timestamp query parameter such as ?t=... gives each refresh a distinct URL, which is a straightforward cache-busting technique. It is especially useful when the camera endpoint always serves the newest frame from one stable path but does not provide cache behavior suitable for frequent polling.
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Cache busting has a cost: every unique URL can be treated as a new request and may reach the origin or a proxy rather than reusing a cached response. At scale, coordinate the browser code with the camera endpoint and any reverse proxy or CDN. The server can send Cache-Control: no-cache to ask caches to revalidate before reuse. Cache-Control: no-store prevents storing the response, but can increase origin traffic. Neither header can make the camera publish new frames more frequently than it actually does.
- If the frame stays stale, verify that the timestamp is changing and that the endpoint accepts query parameters.
- If a proxy or camera software ignores query strings in its cache key, configure its cache behavior or use server-side cache headers.
- If the endpoint generates a different URL for each frame, use the camera-provided URL pattern rather than inventing query parameters it does not support.
Do not use whole-page refresh for an image-only update
<meta http-equiv="refresh" content="10"> reloads the entire document after the specified delay. It may suit a deliberately kiosk-like page with no state to preserve, but it also reloads other page resources and resets page state such as form contents or expanded panels. Frequent automatic page refreshes can disorient people and may not give screen-reader users enough time to finish reading. Updating only the image is generally the more considerate approach.
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- Describe the image. Use meaningful alt text, such as “Latest snapshot of the north entrance camera.” Do not describe it as live video if it is a still image.
- Set dimensions. Explicit
widthandheightreserve space and prevent layout shifts when new frames load. - Show freshness when it matters. A visible last-updated time helps a visitor distinguish a new frame from a stalled camera. Update it only after an image has loaded successfully.
- Stop work that is no longer needed. Call
clearInterval()for an interval timer or clear the pending timeout and mark the poller stopped. Framework components should do this during teardown; pages can also stop polling when the relevant view is hidden. - Keep failures visible but calm. Preserve the last good image and show a concise status rather than replacing it with an error frame or silently suggesting it is current.
- Respect the endpoint. Poll no faster than the actual publication cadence calls for, and account for the number of visitors who may open the page at once.
Troubleshooting common problems
The image never changes
Check the browser’s Network panel to see whether a new request is sent at each interval and whether the request URL has a changing timestamp. If no request appears, confirm the script runs after the image exists and check the browser console for JavaScript errors. If requests appear but the bytes or frame remain identical, the camera may not have published a new snapshot, or a proxy may be ignoring the query string.
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The image breaks after the first refresh
Confirm that the new URL returns an image rather than an HTML error page, login screen, or redirect destination. In the fetch pattern, inspect the HTTP status and response content type; a successful HTTP response is not necessarily an image. Keep the old frame until a valid new image has loaded.
Fetch reports a cross-origin error
The camera server must allow the page’s origin to make a cross-origin fetch. Configure the endpoint’s CORS response if you control it. Otherwise, have a server you control request the snapshot and serve it to the page. Do not add permissive settings to the browser as a workaround; browser security protections are intentional.
The server gets too many requests
Increase the interval, stop polling when the image is off-screen or the page is hidden, and consider serving a cached snapshot through a proxy with an expiration aligned to the camera’s update cadence. Remember that a unique timestamp URL is designed to avoid reuse of a cached image; that can increase traffic if each visitor polls independently.
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Requests pile up or frames arrive out of order
Use the recursive timeout approach so the next request starts after the previous fetch completes. A fixed interval can initiate another request before the prior one finishes, particularly on a slow connection. Also avoid setting the interval shorter than the server’s typical response time unless concurrent requests are deliberate.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server, not a webcam streaming service. It can capture a webpage that displays a snapshot; to keep a page’s image current, the page still needs to obtain updated frames from its camera endpoint. For an on-demand page capture, make one request to the API; see the ScreenshotNeo API documentation for options.
Quick Recap
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);Replace the example target with your page URL. ScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are not billed. Its MCP server lets AI agents take screenshots, and the free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Visit ScreenshotNeo or sign up free.
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