# Help with subflow error detection
**URL:** https://discourse.nodered.org/t/help-with-subflow-error-detection/57813
**Category:** General
**Created:** [5 February 2022 07:19 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813 "2022-02-05T07:19:03Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [5 February 2022 07:19 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/1 "2022-02-05T07:19:03Z")
Sorry folks, but I'm stuck what to do.
**Problem:**
A subflow gives an error and I can't search for which subflow made the error.
It's a given that an error will happen as the code in the subflow ONLY creates errors.
But what you see in the `debug` window (right side) doesn't help me know which subflow caused it.
Options?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [5 February 2022 11:41 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/2 "2022-02-05T11:41:48Z")
Add a Change node after the Catch node that adds something into the message that tells you which one it is.
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [5 February 2022 19:40 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/3 "2022-02-05T19:40:56Z")
Sorry how will adding a `change` node (outside the subflow) help me determine which node in the subflow is causing the error?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [5 February 2022 19:55 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/4 "2022-02-05T19:55:29Z")
You asked:
> [@Trying\_to\_learn](#):
>
> help me know which subflow caused it.
You didn't asked which node was it.
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [5 February 2022 20:00 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/5 "2022-02-05T20:00:57Z")
Yeah, ok... But still, saying I want to identify which subflow.....
How can putting the `change` node OUTSIDE the subflow work?
There are MANY subflows on many tabs. Some used on all tabs.
How would what you suggest help in this situation?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [5 February 2022 21:11 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/6 "2022-02-05T21:11:48Z")
Use different catch nodes for each subflow.
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [5 February 2022 21:16 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/7 "2022-02-05T21:16:19Z")
The error msg gives you an id .. did you search for that id ?
seems to be coming from a Function node ?
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [5 February 2022 23:04 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/8 "2022-02-05T23:04:26Z")
> [@Colin](#):
>
> Use different catch nodes for each subflow.
I didn't know you could put `catch` nodes in subflows.
(If you can, could you show me how? Where would the output of the node go?)
@UnborN
This is an example.
To re-state the problem:
I have MULTIPLE subflows on a machine.
They are used (or could be used) multiple times on several tabs.
The other day I got a message after a machine was rebooted.
Searching the `id` from the error message yielded NOTHING.
So I'm guessing the offending node is in a subflow.
WHICH ONE?
As in which subflow. The specific instance is neither here nor there.
But as is there is no way to track down the error.
Putting a `change` node in the main flow after the `catch` node would be pointless - unless I am missing something. In which case please be specific and not beating around the bush.
Luckily it isn't **Life or Death** but it is annoying.
As I don't even know WHICH subflow it is, I can't really do much.
> [@Colin](#):
>
> Use different catch nodes for each subflow.
Taking that a different way:
So you want me to put a `catch` node for every subflow?
So.... on some machines that would be..... 30 or so at least.
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [5 February 2022 23:59 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/9 "2022-02-05T23:59:45Z")
you are right .. we cant search that id
Did a quick test of a subflow (with a nested Function node that throws an error)
and the error id doesnt match of that of the Function
i thought it would .. hence my suggestion
you have an indication with the Function's name though ..
"This will throw an error" .. funny .. you toying with us ? 😉
> [@Trying\_to\_learn](#):
>
> I didn't know you could put `catch` nodes in subflows.
it doesn't need to be **in** the subflow .. but as Colin said you'll need a Catch node for each subflow
and each Catch node only to be linked to individual Subflow
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [6 February 2022 00:04 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/10 "2022-02-06T00:04:51Z")
So to catch this "one off on reboot" I have to populate my flow with ..... 70 or so `catch` nodes.
Yeah, I'll let this _go to the keeper_. Reward for time is too low.
Yes, the "This will throw an error" is a specific bit of code I use to test my error catching routine and for the sake of making the example easily detectable, I did name the node as shown.
Just to share and maybe help others, this is my routine (subflow in it) that I put on most/all tabs.
There are external things set which are used to identify the flow.
```auto
[{"id":"62be7566.4b4454","type":"subflow","name":"Error catch","info":"","category":"","in":[{"x":120,"y":250,"wires":[{"id":"1b99b8b4.ecf75f"}]}],"out":[{"x":1040,"y":280,"wires":[{"id":"a142130.032a0f","port":0}]},{"x":1040,"y":330,"wires":[{"id":"f632883f.7b7a28","port":0}]}],"env":[],"color":"#DD0000","outputLabels":["Error output","Overspeed alarm"],"icon":"node-red/alert.svg","status":{"x":1040,"y":390,"wires":[{"id":"101bf1bb.1f7d56","port":0}]}},{"id":"ab7353b2.d1b098","type":"msg-speed","z":"62be7566.4b4454","name":"Speed check","frequency":"sec","estimation":false,"ignore":false,"x":450,"y":330,"wires":[["c7fad2ac.ec77e"],[]]},{"id":"c7fad2ac.ec77e","type":"switch","z":"62be7566.4b4454","name":"> max_speed?","property":"payload","propertyType":"msg","rules":[{"t":"gt","v":"max_speed","vt":"global"}],"checkall":"true","repair":false,"outputs":1,"x":620,"y":330,"wires":[["f632883f.7b7a28"]]},{"id":"f632883f.7b7a28","type":"change","z":"62be7566.4b4454","name":"Stop","rules":[{"t":"set","p":"payload","pt":"msg","to":"stop","tot":"str"},{"t":"set","p":"topic","pt":"msg","to":"CONTROL","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":780,"y":330,"wires":[["a142130.032a0f","101bf1bb.1f7d56"]]},{"id":"a142130.032a0f","type":"gate","z":"62be7566.4b4454","name":"","controlTopic":"control","defaultState":"open","openCmd":"go","closeCmd":"stop","toggleCmd":"toggle","defaultCmd":"default","persist":false,"x":920,"y":280,"wires":[[]]},{"id":"45c23f97.247a68","type":"change","z":"62be7566.4b4454","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"error","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":620,"y":280,"wires":[["d9bab478.78eb8"]]},{"id":"1b99b8b4.ecf75f","type":"switch","z":"62be7566.4b4454","name":"RESET?","property":"topic","propertyType":"msg","rules":[{"t":"eq","v":"RESET","vt":"str"},{"t":"neq","v":"RESET","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":240,"y":250,"wires":[["7eb12133.460c6"],["ab7353b2.d1b098","30576976.5a4d76"]]},{"id":"7eb12133.460c6","type":"change","z":"62be7566.4b4454","name":"Go","rules":[{"t":"set","p":"payload","pt":"msg","to":"go","tot":"str"},{"t":"set","p":"topic","pt":"msg","to":"CONTROL","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":430,"y":190,"wires":[["a142130.032a0f","101bf1bb.1f7d56"]]},{"id":"101bf1bb.1f7d56","type":"function","z":"62be7566.4b4454","name":"","func":"if (msg.payload == \"stop\")\n{\n msg.payload = ({fill: \"red\",text:\"Overspeed\"});\n}\nif (msg.payload == \"go\")\n{\n msg.payload = ({fill: \"green\",text:\"Good\"});\n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":930,"y":390,"wires":[[]]},{"id":"dc4e7681.85bec8","type":"moment","z":"62be7566.4b4454","name":"","topic":"","input":"payload","inputType":"msg","inTz":"Australia/Sydney","adjAmount":0,"adjType":"days","adjDir":"add","format":"YYYY-MM-DD HH:mm:ss","locale":"en_AU","output":"payload","outputType":"msg","outTz":"Australia/Sydney","x":745,"y":230,"wires":[["b6239445.5a3bb"]],"l":false},{"id":"b6239445.5a3bb","type":"change","z":"62be7566.4b4454","name":"Time","rules":[{"t":"move","p":"payload","pt":"msg","to":"time","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":920,"y":230,"wires":[["b8ab3ac7.6b4788"]]},{"id":"30576976.5a4d76","type":"change","z":"62be7566.4b4454","name":"Save","rules":[{"t":"set","p":"payload","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":430,"y":230,"wires":[["372932c7.1c595e"]]},{"id":"b8ab3ac7.6b4788","type":"change","z":"62be7566.4b4454","name":"Get","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":430,"y":280,"wires":[["45c23f97.247a68"]]},{"id":"372932c7.1c595e","type":"change","z":"62be7566.4b4454","name":"TimeStamp","rules":[{"t":"set","p":"payload","pt":"msg","to":"","tot":"date"}],"action":"","property":"","from":"","to":"","reg":false,"x":610,"y":230,"wires":[["dc4e7681.85bec8"]]},{"id":"d9bab478.78eb8","type":"function","z":"62be7566.4b4454","name":"Get name/s","func":"//var flow_name = flow.get(\"$parent.name\");\n//return msg;\n\nvar device_name =global.get('myDeviceName');\nvar flow_name = flow.get(\"$parent.name\");\nmsg.topic =\"ERROR_REPORT/\" + device_name + \"/\" + flow_name;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":745,"y":280,"wires":[["a142130.032a0f"]],"l":false},{"id":"aa78ace9.fb58","type":"inject","z":"aa48e352.9ad2f8","name":"Reset","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"RESET","payload":"","payloadType":"date","x":3710,"y":230,"wires":[["a5b8b147.602cd"]]},{"id":"a5b8b147.602cd","type":"subflow:62be7566.4b4454","z":"aa48e352.9ad2f8","name":"","x":3910,"y":200,"wires":[["c8e77e13.fe80b","5a4619d.343b0e8"],["786991bf.44a08"]]},{"id":"786991bf.44a08","type":"link out","z":"aa48e352.9ad2f8","name":"Runaway","links":["8da8c919.68c64","71f2396c.bae758","790c18ae.de419"],"x":4090,"y":230,"wires":[],"l":true},{"id":"1d24f9c6.5e269e","type":"catch","z":"aa48e352.9ad2f8","name":"","scope":null,"x":3700,"y":180,"wires":[["a5b8b147.602cd"]]},{"id":"2959e713.3ff1a8","type":"inject","z":"aa48e352.9ad2f8","name":"RESET","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"CONTROL","payload":"reset","payloadType":"str","x":3890,"y":310,"wires":[["5a4619d.343b0e8"]],"icon":"font-awesome/fa-eject"},{"id":"b9166288.3410d8","type":"inject","z":"aa48e352.9ad2f8","name":"Next","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"CONTROL","payload":"trigger","payloadType":"str","x":3890,"y":270,"wires":[["5a4619d.343b0e8"]],"icon":"node-red/trigger.svg"},{"id":"5a4619d.343b0e8","type":"q-gate","z":"aa48e352.9ad2f8","name":"qgate","controlTopic":"CONTROL","defaultState":"queueing","openCmd":"Go","closeCmd":"Stop","toggleCmd":"toggle","queueCmd":"queue","defaultCmd":"default","triggerCmd":"trigger","flushCmd":"flush","resetCmd":"reset","peekCmd":"","dropCmd":"","statusCmd":"","maxQueueLength":"50","keepNewest":true,"qToggle":false,"persist":false,"x":4080,"y":270,"wires":[["e552f4d2.7ddcb"]]},{"id":"e552f4d2.7ddcb","type":"debug","z":"aa48e352.9ad2f8","name":"Machine health error list","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":4290,"y":270,"wires":[]}]
```
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [6 February 2022 00:15 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/11 "2022-02-06T00:15:05Z")
> [@Trying\_to\_learn](#):
>
> I did name the node as shown.
ok .. and this Function is in a Subflow
and you have 70 instances of the same Subflow ?
> [@Trying\_to\_learn](#):
>
> So to catch this "one off on reboot"
if it always happens on reboot .. maybe you could disable parts or whole Flows to cut the problem down
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [6 February 2022 00:39 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/12 "2022-02-06T00:39:26Z")
> [@UnborN](#):
>
> ok .. and this Function is in a Subflow
> and you have 70 instances of the same Subflow ?
In **THIS** example: yes.
(Where I created the error to demonstrate the problem)
**In Reality:** I don't know what node is causing the problem.
Other than it is from one of many subflows.
I'm moving on. Too much time spent on this and it isn't getting me anywhere.
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [6 February 2022 00:55 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/13 "2022-02-06T00:55:57Z")
Its an interesting problem ..
there is an alternative that i just tested ..
do the opposite .. **DONT** use Catch nodes and let it throw an error!
and hover over the Error msg (or double click it) and that will indicate what Subflow created it
.. and once you know what msg and subflow threw it .. do better handling so it doesnt happen
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [6 February 2022 01:05 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/14 "2022-02-06T01:05:05Z")
I will probably have to do that for now.
Considering I know _SFA_ about javascript and the like.....
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [6 February 2022 07:58 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/15 "2022-02-06T07:58:23Z")
same here .. learning too .. much from your posts
If you going the Javascript path then look into using a `try catch` code block
lets say you have a Function and all you know is that it "may throw an error" (jk) at some point
add its logic into a try catch block and handle the error the way you want
**Example Flow**
```auto
[{"id":"249b35248bafa4e5","type":"subflow","name":"Subflow 1","info":"","in":[{"x":60,"y":80,"wires":[{"id":"98b5654cb92a28bf"}]}],"out":[{"x":340,"y":80,"wires":[{"id":"98b5654cb92a28bf","port":0}]}]},{"id":"98b5654cb92a28bf","type":"function","z":"249b35248bafa4e5","name":"","func":"try {\n if (msg.payload === 0) {\n throw new Error(\"Division with 0\")\n }\n else {\n msg.payload = 100 / msg.payload\n return msg;\n }\n\n} catch (error) {\n node.error({\n err: error.toString(),\n path: node.path\n });\n};\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":200,"y":80,"wires":[[]]},{"id":"1e1a03c34b5cb1ea","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"2","payloadType":"num","x":370,"y":560,"wires":[["28e6cec63f859578"]]},{"id":"512bf5b8411fa155","type":"debug","z":"54efb553244c241f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":750,"y":640,"wires":[]},{"id":"28e6cec63f859578","type":"subflow:249b35248bafa4e5","z":"54efb553244c241f","name":"","x":560,"y":640,"wires":[["512bf5b8411fa155"]]},{"id":"120c580756d7c9ab","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"4","payloadType":"num","x":370,"y":640,"wires":[["28e6cec63f859578"]]},{"id":"34ea84f8f5c15d3d","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"0","payloadType":"num","x":370,"y":720,"wires":[["28e6cec63f859578"]]},{"id":"7d1a7f458ddda6f4","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"2","payloadType":"num","x":370,"y":820,"wires":[["a759eea439131a96"]]},{"id":"3c04342414aa88e4","type":"debug","z":"54efb553244c241f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":750,"y":900,"wires":[]},{"id":"a759eea439131a96","type":"subflow:249b35248bafa4e5","z":"54efb553244c241f","name":"","x":560,"y":900,"wires":[["3c04342414aa88e4"]]},{"id":"6bd8c182b52d8423","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"4","payloadType":"num","x":370,"y":900,"wires":[["a759eea439131a96"]]},{"id":"997577ae273bf091","type":"inject","z":"54efb553244c241f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"0","payloadType":"num","x":370,"y":980,"wires":[["a759eea439131a96"]]}]
```
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [6 February 2022 08:07 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/16 "2022-02-06T08:07:06Z")
I had a quick look at your code, but....
I fear we are not on the same page, sorry.
Your example is a given node that will error in a subflow.
I don't know which node will _fail_ in my subflows.
All information sent to the `catch` node is processed by my code and there is nothing to point to the offending subflow name.
Look back at my 10'th post.
It has the code I use to parse the output of the `catch` node.
Rather than posting the whole flow and subflows, etc.....
How about just post the lines of Javascript I need to use to get/gleam the desired information.
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [6 February 2022 08:59 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/17 "2022-02-06T08:59:45Z")
> [@Trying\_to\_learn](#):
>
> So to catch this "one off on reboot" I have to populate my flow with ..... 70 or so `catch` nodes
You presumably already know which flow tab it is on, from which Catch node it is. Do you have 70 subflows on one flow tab?
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [6 February 2022 18:24 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/18 "2022-02-06T18:24:21Z")
> [@Trying\_to\_learn](#):
>
> I don't know which node will _fail_ in my subflows.
ok .. back to the drawing board
Give all your functions or nodes unique names.
Use a Catch node inside the Subflow wired to output 2
The bottom output will be used for error reporting which will help identify where the error came from.
The error `name` will identify the nested node
**Modified Test flow:**
```auto
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```
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [6 February 2022 19:47 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/19 "2022-02-06T19:47:56Z")
No, but I would say the entire flow would have 70 subflows in/on it.
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [6 February 2022 21:32 UTC](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813/20 "2022-02-06T21:32:23Z")
That is irrelevant. If you already have a catch node on each tab then you know which tab it is.
[Next page](https://discourse.nodered.org/t/help-with-subflow-error-detection/57813.md?page=2)