how to parse a JSON object --JavaScript

Hello ,
  I have complex json object that I need some help to parse..

I want all the QE elements value
e.g

Id = 21,
Label =First Name,
Value = FNl
-----------------
 Id:= 22,
Label = Last Name
Value": LN

[
  {
    "CanAdd": false,
    "QG": [
      {
        "Id": 3,
        "Name": "Name",
        "Q": [
          {
            "Id": 1,
            "Name": "First Name",
            "QE": [
              {
                "Id": 21,
                "Label": "First Name",
                "Value": FN
              }
            ],
            "Version": "1",
            "Display": false
          },
          {
            "Id": 2,
            "Name": "Last Name",
            "QE": [
              {
                "Id": 22,
                "Label": "Last Name",
                "Value": LN
              }
            ],
            "Version": "1",
            "Display": false
          }
        ],
        "Version": "1",
        "Display": false
      }
    ]
  },
  {
    "CanAdd": false,
    "QG": [
      {
        "Id": 30,
        "Name": "address",
        "Q": [
          {
            "Id": 1,
            "Name": "address",
            "QE": [
              {
                "Id": 21,
                "Label": "address1",
                "Value": AD1
              }
            ],
            "Version": "1",
            "Display": false
          }
        ],
        "Version": "1",
        "Display": false
      }
    ]
  },
  {
    "CanAdd": false,
    "QG": [
      {
        "Id": 30,
        "Name": "phone",
        "Q": [
          {
            "Id": 1,
            "Name": "phone1",
            "QE": [
              {
                "Id": 21,
                "Label": "phone1",
                "Value": PH1
              }
            ],
            "Version": "1",
            "Display": false
          }
        ],
        "Version": "1",
        "Display": false
      }
    ]
  }
]

                                  

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