How to parse in javascript [duplicate]

i have below json data

"D3" : {
                "D3-00" : {
                    "DATETIME" : "01-11-2022 17:00:25",
                    "MECHANISM" : "",
                    "B2" : {
                        "DATETIME" : "01-11-2022 00:00:00",
                        "MECHANISM" : "Auto"
                    },
                            }
        }

How do i traverse inside D3.D3-00.DATETIME
currently i am getting error as NaN