If youre looking for manual way to look it up rather than a programatic way...
Fastest way i've found is to just start typing it in the advanced issue search. When the autocomplete popup displays, it will list the field appended with "- [cf#####] the #### part is the field ID.
@Randy You've found the easiest process - just to outline it in 2020 on Jira Server:
1. go to Issues > Search,
I'm on Jira Server 8.5
@Simen Eriksen Oh no! I see that too and it's too bad because it was so convenient to use as a lookup.
Alternate route to get to it is now:
Please share if you've found a faster way to locate.
If you are an admin, you can go Administration > Custom Field and hover over the Edit operation to find the id of the field in the url. Or right click and open the Edit url to open it in a new tab. That way you can see the field id in the browser.
You can also get the id from Database if you have access to the DB tables.
If none of that is an option, use the JIRA REST API to retrieve the fields available for a given project and issue type like this:
If you have "Jira Cloud for Sheets" add-on w/ Google Sheets, you can search issue fields which will show the customID. In case you have many similarly names fields, you may want to search a specific project key and select all possible fields and see which returns the result you are searching for.
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