JSON parse, braces for empty fields

I have an object in the response string which has empty/null/blank fields like field2 below:

obj {
    "field1": "somevalue",
    "field2": {}
}

when JSON.parsed(obj), obj.field2 gives "{}" instead of blank.

I'd want to get a blank string instead of the braces. Any suggestions to deal with this are most welcome. Thanks in advance.

obj {
    "field1": "somevalue",
    "field2": ""
}