[Includes] Determining custom field IDs
There are several ways to determine the field ID of a custom field; the most straightforward is to check the URL of the custom field when editing its details through the Jira Custom fields screen. To find the ID of a custom field:
Log into Jira as an Administrator.
In the upper right corner of the window, click Settings ( ) and select Issues.
In the left-hand sidebar, click Custom fields.
Locate your custom field in the list; use the filter at the top of the list to search.
Click the action button at the far right ( ) and select Edit details.
Check the URL for the page that opens - the final argument of the URL is the field ID (Figure 1, right).
Append this value to “customfield_” to get the full ID of the field. For example,
customfield_10130
is the field ID of Projected Due Date, shown in Figure 1, right.