SharePoint Server Getting WorkflowInstanceID with REST API

Question

Company is using SharePoint Server 2013 and i'm trying to write a service for another application which people can track workflow status.

What i try is getting Workflow Instance ID with;

/_api/web/lists/GetByTitle('Library Name')/Items(5)?$select=WorkflowInstanceID and there is no select for list item like $select=WorkflowAssociations. And there is no $expand='workflowname' option. Because workflow is not expandable.

but WorkflowInstanceID always returns null, even i got attached multiple workflows and all of them started and completed.

My main goal is creating URL like /_layouts/15/WrkStat.aspx?List={ListGuid}&WorkflowInstanceID={WorkflowInstanceGuid} so when people click this link, they can track the workflow steps.

I've also tried to use Tasks list with /_api/web/lists/getbytitle('Tasks')/Items, but this list also doesn't return Task's associated list item's GUID or WorkflowInstanceID

Answer 1

A SharePoint list should contain an hyperlink field with your workflow name. This field can be used to get the full URL to the workflow instance.

<<site url>>/_api/web/Lists/getByTitle('<<list title>>')/Items(<<item id>>)

The above API endpoint will return all columns including workflow field with the URL value.

Try this and let me know if it works for you.