As described here, a new REST API call was introduced in JIRA 7.0 that returns the value of the property with a given key from the user identified by the key or by the id. However, it's always returning Error 404.
Returns the value of the property with a given key from the user identified by the key or by the id.
Error 404 is returned, which means user with given key or id does not exist or if the property with given key is not found.
- Add a key-value pair under properties on <instance url>/secure/admin/user/EditUserProperties.jspa?name=<user>;
- Try to list the property value of the key for this user with the below REST API call;
- Observe the response returned is code 404;
At this point, there's no workaround for obtaining users' properties using a REST API call.