Trigger a flow when a node throws an error
Problem
You want to trigger a flow when a node throws an error.
Solution
Use the Catch node to receive the error and trigger a flow.
Example
[{"id":"2bd6810d.e22ece","type":"catch","z":"fc046f99.4be08","name":"","scope":["2c94a22c.91012e"],"uncaught":false,"x":130,"y":160,"wires":[["d16b9fac.8212a"]]},{"id":"2c94a22c.91012e","type":"function","z":"fc046f99.4be08","name":"Throw Error","func":"node.error(\"an example error\", msg); ","outputs":1,"noerr":0,"x":310,"y":100,"wires":[[]]},{"id":"d16b9fac.8212a","type":"debug","z":"fc046f99.4be08","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"error","targetType":"msg","x":300,"y":160,"wires":[]},{"id":"c5ee9670.5dbbd8","type":"inject","z":"fc046f99.4be08","name":"Trigger error","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":110,"y":100,"wires":[["2c94a22c.91012e"]]}]
Discussion
The Catch node can be configured to catch errors from
specific nodes in the flow or from any node. This allows you to create different
error handling flows for different nodes.
The Catch node sends on the message that was logged with
the error. It also sets msg.error with details of the error and which node triggered
it.
Note that this requires nodes to properly log their errors so that they can be caught.
