Cant get the 1st row from JSON Parsing array

Question

Im trying to get the participants data from API response..

                //Level 1
                Map<String, Object> MapLv1 = (Map<String, Object>) JSON.deserializeUntyped(parser);
                system.debug('MapLv1 Conversation Summary ==>'+MapLv1);

                List<Object> arrayConversationSummary = new list <Object>();
                for (Object o : (List<Object>)Maplv1.get('participants')){
                    arrayConversationSummary.add(o);
                }

As you can see, i tried to get the participants array data and store it inside list of object..

this is the response example :

{
"id": "3a8c8cce-1630-4b97-addf-ebffd22360ed",
"startTime": "2018-11-05T10:39:29.517Z",
"endTime": "2018-11-05T10:45:58.398Z",
"address": "tel:+0000",
"participants": [
    {
        "id": "3fe49839-1297-464c-bab5-2b914f9e0257",
        "startTime": "2018-11-05T10:39:29.517Z",
        "endTime": "2018-11-05T10:44:57.877Z",
        "connectedTime": "2018-11-05T10:39:29.546Z",
        "name": "Mobile",
        "queueId": "f7866f57-3522-487e-9a62-7889cd68f782",
        "queueName": "Test Queue",
        "purpose": "customer",
        "participantType": "External",
        "address": "tel:0000",
        "ani": "tel:0000",
        "aniName": "Mobile",
        "dnis": "tel:+0000",
        "wrapupRequired": false,
        "attributes": {
            "SF_WorkSpace": "https://cs5.salesforce.com/console#https%3A%2F%2Fcs5.salesforce.com%2F003O000001COyPi%3Fkey%3D081932903944|%2Fapex%2FPolicyInfoPage%3FparentId%3D1159%26contactID%3D003O000001COyPi%26sessionID%3D003O000001COyPi-005900000052HdyAAE-20181105-05e5d7f02c24c2ee31622061bca94bd4%26policyNo%3D112-01-01%26entity%3DAFI%26policyApp%30000D%26agentS00ervicingCode%3D%26agentProducingCode%3D|%2Fapex%2FClaimInfoPage%3FparentId%3D1159%26contactID%3D003O000001COyPi%26sessionID%3D003O000001COyPi-005900000052HdyAAE-20181105-05e5d7f02c24c2ee31622061bca94bd4%26policyNo%3D112-01-01%26entity%3DAFI%26policyApp000%3D%26agentServicingCode%3D%26agentProducingCode%3D|%2Fapex%2FRHSInfoPage%3FparentId%3D1159%26contactID%3D003O000001COyPi%26sessionID%3D003O000001COyPi-005900000052HdyAAE-20181105-05e5d7f02c24c2ee31622061bca94bd4%26policyNo%3D112-01-01%26entity%3DAFI%26policyApp%3D%26agentServicingCode%3D%26agentProducingCode%3D|%2Fapex%2FCHSInfoPage%3FparentId%3D1159%26contactID%3D003O000001COyPi%26sessionID%3D003O000001COyPi-005900000052HdyAAE-20181105-05e5d7f02c24c2ee31622061bca94bd4%26policyNo%3D112-01-01%26entity%3DAFI%26policyApp%3D%26agentServicingCode%3D%26agentProducingCode%3D|%2Fapex%2FInquiryInfoPage%3FparentId%3D1159%26contactID%3D003O000001COyPi%26sessionID%3D003O000001COyPi-005900000052HdyAAE-20181105-05e5d7f02c24c2ee31622061bca94bd4%26policyNo%3D112-01-01%26entity%3DAFI%26policyApp%3D%26agentServicingCode%3D%26agentProducingCode%3D",
            "SF_WorkSpaceAssociations": "{\"interactionId\":\"0000-1630-0000-addf-0000000\",\"Contacts\":{\"00000\":{\"text\":\"PureCloud 0000- Contact\",\"id\":\"00000\",\"reason\":\"Workspace Transfer\",\"select\":true}},\"Relates\":{}}",
            "CWC_allowACD": "true"
        },
        "calls": [
            {
                "state": "terminated",
                "id": "c339db69-12ac-4cad-9f71-6490c1778b46",
                "direction": "inbound",
                "recording": false,
                "recordingState": "none",
                "muted": false,
                "confined": false,
                "held": false,
                "segments": [
                    {
                        "startTime": "2018-11-05T10:39:29.520Z",
                        "endTime": "2018-11-05T10:39:29.546Z",
                        "type": "System",
                        "howEnded": "Interact"
                    },
                    {
                        "startTime": "2018-11-05T10:39:29.546Z",
                        "endTime": "2018-11-05T10:44:57.877Z",
                        "type": "Interact",
                        "howEnded": "Disconnect",
                        "disconnectType": "endpoint"
                    }
                ],
                "disconnectType": "endpoint",
                "connectedTime": "2018-11-05T10:39:29.546Z",
                "disconnectedTime": "2018-11-05T10:44:57.877Z",
                "disconnectReasons": [],
                "provider": "Edge",
                "self": {
                    "name": "Mobile",
                    "nameRaw": "",
                    "addressNormalized": "tel:000000",
                    "addressRaw": "sip:[email protected]",
                    "addressDisplayable": "unavailable"
                },
                "other": {
                    "name": "Jakarta, Indonesia",
                    "nameRaw": "",
                    "addressNormalized": "tel:+00000",
                    "addressRaw": "sip:00000@000-000:5060",
                    "addressDisplayable": "unavailable"
                }
            }
        ]

but when I check the debug, the participants data start from 'address' not from 'id', and the parsing result only get the address, ani, and aniName from the JSON response.. there`s no Id..

when I put the response to Map, the Id disappeared

Answer 1

JSON.deserializeUntyped returns an object where the keys are in ascending alphabetical order. ID is going to appear far to the right of where the log is cut off in your screenshot, but it is there. You can see the ID using something like this:

for(Object o : (List<Object>)Maplv1.get('participants')){
    Map<String, Object> keyMap = (Map<String, Object>)o;
    system.debug('participant id: '+(String)keyMap.get('id'));
    // ... //
}