Compare markup and send webhook alerts
Detect markup changes on a news list and an API answer and post each change and each failed page to a webhook.
Updated November 13, 2026
What this example returns
The dataset’s “Overview” view shows 14 columns: Page, Status, Change, Changed %, Title, Checked, Previous check, Last change, Checks, Changes, Screenshot, Before last change, Note, and Error. See every output field.
What each setting does
The input this example runs Website Change Monitor with. “Try this input” opens it in the console, where you can run it as-is or change any field first.
- Pages to monitor
startUrls https://news.ycombinator.com/newest, https://httpbin.org/uuid, https://scrape.ly/this-page-does-not-exist
Web pages to check. Each run compares every page with the version saved by the previous run of the same monitor and reports what changed. `url` (one address) and `urls` (a list) are accepted too.
- Compare
compareOn HTML markup
`text` compares the visible text, so restyled or re-indented markup is not a change. `html` compares the markup of the area (links, attributes, images), without scripts and comments.
Default: Visible text → this example uses HTML markup
- Monitor name
monitorName news-markup
Each monitor keeps its own history of page versions in your account. Runs with the same name continue the same history; use different names to watch the same page separately. Leave empty to use the saved task's own history (or `default` outside a task).
- Webhook URL
webhookUrl https://httpbin.org/post
Optional. Receives a JSON POST for every changed page. The body has a ready-made `text` (and `content`) summary, so a Slack, Microsoft Teams or Discord incoming webhook URL works as is, plus the added and removed lines.
- Also notify when a page cannot be checked
notifyOnErrors Yes
Send a webhook notification when a page fails to load, is blocked or the monitored area is missing.
Default: No → this example uses Yes
{
"startUrls": [
{
"url": "https://news.ycombinator.com/newest"
},
{
"url": "https://httpbin.org/uuid"
},
{
"url": "https://scrape.ly/this-page-does-not-exist"
}
],
"compareOn": "html",
"webhookUrl": "https://httpbin.org/post",
"notifyOnErrors": true,
"monitorName": "news-markup"
}What it costs
You pay for the events the actor reports, such as each result or page it produces. Platform usage is included in the event prices: compute, proxies, browser and storage cost nothing extra.
- Page checkfrom $0.0012One page loaded and compared with its previous version, whether it changed or not, also in the browser or with screenshots. Pages that cannot be checked are free.
Other ways to run Website Change Monitor
- Watch the main area of several pagesCompare the main content of pricing, docs and API pages with the last check, ignoring footers and clock times.
- Rendered pages with screenshotsLoad pages in the browser, compare their main area and keep before and after screenshots.
About Website Change Monitor
Watch any web page, or just one part of it, for changes. Every run compares each page with the previous check and returns what changed: added and removed lines, a diff, change share, before and after content and optional screenshots, with webhook alerts for Slack, Teams or Discord.
- Price:
- from $1.20 / 1,000 results
- Developer:
- Querystone
- Categories:
- Developer tools, Automation, SEO tools
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