API response failed its body assertion

What it usually means

The API answered with a success status, but the response body did not pass the assertion set on this monitor: a required string was missing, a JSON field was absent, or it did not hold the expected value. The endpoint is reachable; the data it returns is what changed.

What to check first

• The field or text still exists in the response: a deploy that renamed a JSON key or changed a status string is the usual cause.
• The expected value: if the assertion is "equals", compare it with what the endpoint returns now.
• Whether the endpoint returns a different shape for the monitor's request (auth, headers, method) than for your browser.

How ErrorDetector reports it

The target answered, so this is reported as a failed check, not downtime: the alert names the reason, the uptime percentage is untouched, and a recovery notice follows when the check passes again.

Caught by: api monitors. Read about the api monitoring feature.