Preserve exception details in console logs

Console methods now preserve exception details in your Worker's logs. When your Worker logs an exception, the corresponding log entry includes the exception name, message, and stack.

For example, your Worker can catch and log an exception:

try {
	throw new Error("Deliberately created exception");
} catch (error) {
	console.error("caught exception:", error);
}

try {
	throw new Error("Deliberately created exception");
} catch (error) {
	console.error("caught exception:", error);
}

If you use Workers Observability, your log is automatically enriched with structured error information. The following example shows how the enriched log appears in the Cloudflare dashboard:

The exception's stack trace appears directly in the log message.

If you send telemetry to a Tail Worker, the Tail Worker now receives a log entry with an errorInfo array:

{
	"message": ["Request failed:", "RangeError: Value out of range"],
	"errorInfo": [
		null,
		{
			"name": "RangeError",
			"message": "Value out of range",
			"stack": "RangeError: Value out of range\n    at ..."
		}
	],
	"level": "error",
	"timestamp": 1784851200000
}

Each errorInfo item corresponds to the console argument at the same index in message. Arguments that are not exceptions have a null entry.