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Append a value to a custom field of type as an action


I'm trying to update a custom field that allows multiple object values, and I would like to add another object when the summary field is updated.

I'm have not found documentation on how to do this on automation, and when I try the following:

"update": {
"custom_XXX": [{
"add": {"key":"YYYY"}

I get an error that the field is not an array.

I guess it is needed to do some JSON manipulation.

How would be the proper way to achieve it?


1 answer

1 accepted

1 vote
Answer accepted
Sherry Goyal Atlassian Team May 31, 2021

Hello @Miguel Blasco 

Documentation is present here.

I would suggest to make some GET API calls to validate structure of object, allowed values and possible operations. Look for more details here.

Hope this helps to debug your case here.


Thanks, the field supports the following operations:


and when i try to perform the following action:


   "update": {
      "XXX": [{
         "add": "YYY"


I got the following error: 

Error editing issuesCLM-636 (data was not an array (customfield_19430))

What am i doing wrong?


Sherry Goyal Atlassian Team Jun 02, 2021


Your schema type is "any" not "array", hence you are facing this issue. Might wanna try re-creating custom field of type array and this shall work then.



Thanks for the input. But would it be possible to do something else on the update action?

This is a heavily used field and changing the type might be not possible at this point.

Thanks and best regards,


For updating Insight fields, might be good to try this:

Let me know how it goes!

yes , this documentation helped.

FYI you can still have add operations despite having a type "any". the issue was how i was adding the value:

"add": "YYY" -> "add": [{"key": "YYYk"}]

maybe for the future it would be useful to have those links on the automation documentation? Or at least made more explicit?

(It might be the first 2 were visible, but not the latter).

Thanks and best regards,


Sherry Goyal Atlassian Team Jun 03, 2021

Glad to hear that. Thanks for the update. This work in is progress to put together these docs but yes I will update our technical writer with your feedback. 



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