Glossary · Types of monitoring
Keyword monitoring checks that a web page’s response contains, or does not contain, a specific piece of text, so a page that loads but shows the wrong content counts as a failure.
A status code alone doesn’t prove a page works. Error pages, empty product lists, maintenance notices and a hacked page can all be served with HTTP 200. A keyword such as “Add to cart” that only appears when the page works, or an error text that must not appear, turns those into failures.
Pick text that is stable and specific: a button label, a product name, a line in the footer rendered by the application. Avoid text that changes with A/B tests, prices or language.
Keyword checks read the HTML the server returns. Text added later by JavaScript in the browser isn’t in it; check that with a browser-based synthetic check instead.
Uptimecheck HTTP monitors can require a keyword or require that it is absent, in the first 2 MB of the response, and the match is exact, including upper and lower case. For APIs, JSON checks such as $.status equals ok work the same way, and flows that run in a real browser can check text that JavaScript renders.
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ReadIt depends on the tool. In Uptimecheck it is: “Add to cart” doesn’t match “add to cart”.
Partly. A “must not contain” check on words an attacker would add, or a “must contain” check on your own footer text, catches a page that was replaced.
The text is probably added by JavaScript after the page loads, or differs in case, spacing or encoding in the HTML. View the page source to see what the server returns.
Set up your first monitor in under a minute, or look around the live demo first.
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