how do I eport json to variables and access the values

how do I eport json to variables and access the values

Please see the JSON below. This is what I get in a ajax response. I am new to javascript and need some help. How do I set, for example the Fields(third line down) to it's own variable and then query the variable to show the subfield. for example fields.System.WorkItemType. As the System.WorkItemType has a dot in the middle of it does this make a different of how to get the value?


    "id": 45,
    "rev": 1,
    "fields": {
        "System.AreaPath": "H3P",
        "System.TeamProject": "H3P",
        "System.IterationPath": "H3P",
        "System.WorkItemType": "User Story",
        "System.State": "New",
        "System.Reason": "New",
        "System.CreatedDate": "2019-03-04T13:52:36.113Z",
        "System.CreatedBy": {
            "displayName": "BobOrgane",
            "url": " https://app.vssps.visualstudio.com/A7e32c6f3-e95b-44e0-ddf7-4778097d4065/_apis/Identities/a24f3e56-1c5c-4b6e-bc9e-f6293c784cc2",
            "_links": {
                "avatar": {
                    "href": " https://dev.azure.com/BobOrgane/_apis/GraphProfile/MemberAvatars/msa.YWExNTNkYfktOTY5Yy03ZfFlLThmNTEtN2Y1fjlhZDA1Ey"
                }
            },
            "id": "a20f3f56-1c5c-4b6e-bc9e-f6297c784cc1",
            "uniqueName": " BobOrgane@boborgane.com",
            "imageUrl": " https://dev.azure.com/organisation/_api/_common/identityImage?id=a20f3f56-4c5c-4b6e-bd9e-f6237c784cc1",
            "descriptor": "msa.YWExNTNkYfktOTY5Yy03ZfFlLThmNTEtN2Y1fjlhZDA1Ey"
        },
        "System.ChangedDate": "2019-03-04T13:52:36.113Z",
        "System.ChangedBy": {
            "displayName": "BobOrgane",
            "url": " https://app.vssps.visualstudio.com/A7e32c6f3-e95b-44e0-ddf7-4778097d4065/_apis/Identities/a24f3f56-1c5c-4b6e-bc9e-f629ec784cc1",
            "_links": {
                "avatar": {
                    "href": " https://dev.azure.com/organisation/_apis/GraphProfile/MemberAvatars/msa.YWExNTNsYTktOTY5ry03ZDFlLTgmNTEtN2Y1ZjlhZDA1Ey"
                }
            },
            "id": "a20f3f56-1c5c-4b6e-bc9e-f6297c784cc1",
            "uniqueName": " BobOrgane@boborgane.com",
            "imageUrl": " https://dev.azure.com/organisation/_api/_common/identityImage?id=a20f3f56-1c5c-4b6e-bc9e-f6297ce84cc2",
            "descriptor": "msa.YrExNTNkYTktOrY5Yy03ZDFlLTrmNTEtN2r1ZjlhZDA1Ey"
        },
        "System.CommentCount": 0,
        "System.Title": "test",
        "System.BoardColumn": "New",
        "System.BoardColumnDone": false,
        "Microsoft.VSTS.Common.StateChangeDate": "2019-03-04T13:52:36.113Z",
        "Microsoft.VSTS.Common.Priority": 2,
        "Microsoft.VSTS.Common.ValueArea": "Business",
        "WEF_3A37B87DC2314411B6102E16FCA9EB7F_Kanban.Column": "New",
        "WEF_3A37B87DC2314411B6102E16FCA9EB7F_Kanban.Column.Done": false,
        "System.Description": "<div>test<br></div>"
    },
    "_links": {
        "self": {
            "href": " https://dev.azure.com/organisation//ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItems/45"
        },
        "workItemUpdates": {
            "href": " https://dev.azure.com/organisation/ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItems/45/updates"
        },
        "workItemRevisions": {
            "href": " https://dev.azure.com/organisation/ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItems/45/revisions"
        },
        "workItemComments": {
            "href": " https://dev.azure.com/organisation//ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItems/45/comments"
        },
        "html": {
            "href": " https://dev.azure.com/organisation/web/wi.aspx?pcguid=fab264cc-ccbe-48c0-a543-b80d427c04bc&id=45"
        },
        "workItemType": {
            "href": " https://dev.azure.com/organisation//ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItemTypes/User%20Story"
        },
        "fields": {
            "href": " https://dev.azure.com/organisation//ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/fields"
        }
    },
    "url": " https://dev.azure.com/organisation//ad61ff7e-989f-5d25-92df-ac4cb460wedf/_apis/wit/workItems/45"
}