Changing an Array format in Javascript

I have an array as below

    [
      {
        CRT_FIRST_NAME: 'Shekhar',
        CRT_MIDDLE_NAME: 'Kumar'
      },
      {
        CRT_FIRST_NAME: 'Sameer',
        CRT_MIDDLE_NAME: 'Kumar'
      },
      {
        CRT_FIRST_NAME: 'Martin',
        CRT_MIDDLE_NAME: undefined
      }
    ]

to the below format. i.e, I want to have double quotes for both keys and values. I tried JSON.stringify but it is giving me errors

 [
      {
        "CRT_FIRST_NAME": "abc",
        "CRT_MIDDLE_NAME": "Kumar"
      },
      {
        "CRT_FIRST_NAME": "pqr",
        "CRT_MIDDLE_NAME": "Kumar"
      },
      {
        "CRT_FIRST_NAME": "sample",
        "CRT_MIDDLE_NAME": "Kumar"
      }
    ]