Redmine

In XML everything ok.

<issues type="array">
    <issue>
        <id>3</id>
        <project name="c4" id="1"/>
        <tracker name="Unterstützung" id="3"/>
        <status name="Neu" id="1"/>
        <priority name="Dringend" id="6"/>
        <author name="User Name Admin" id="1"/>
        <assigned_to name="User Name Admin" id="1"/>
        <subject>test uuid</subject>
        <description/>
        <start_date>2010-12-24</start_date>
        <due_date>2010-12-30</due_date>
        <done_ratio>0</done_ratio>
        <estimated_hours>24.0</estimated_hours>
        <custom_fields>
            <custom_field name="issues_uuid" id="3">f0df939d-65a7-bf84-71e9-fdb54373ecfc</custom_field>
        </custom_fields>
        <created_on>Wed Dec 22 09:39:04 +0100 2010</created_on>
        <updated_on>Wed Dec 22 09:49:54 +0100 2010</updated_on>
    </issue>
</issue>

In JSON missing custom field: issues_uuid.

[{"start_date":"2010/12/24",
"estimated_hours":24.0,
"priority_id":6,
"created_on":"2010/12/22 09:39:04 +0100",
"project_id":1,
"root_id":3,
"lock_version":1,
"lft":1,
"fixed_version_id":null,
"updated_on":"2010/12/22 09:49:54 +0100",
"subject":"test uuid",
"id":3,
"done_ratio":0,
"assigned_to_id":1,
"tracker_id":3,
"category_id":null,
"parent_id":null,
"due_date":"2010/12/30",
"status_id":1,
"description":"",
"author_id":1,
"rgt":2}]