original.json

{"foo":"bar","num":3,"nes":{"ted":["is",1]}}

result.json

{
  "string": "{\"foo\":\"bar\",\"num\":3,\"nes\":{\"ted\":[\"is\",1]}}",
  "children": {
    "foo": {
      "string": "\"foo\":\"bar\""
    },
    "num": {
      "string": ",\"num\":3"
    },
    "nes": {
      "string": ",\"nes\":{\"ted\":[\"is\",1]}",
      "children": {
        "ted": {
          "string": "\"ted\":[\"is\",1]",
          "children": {
            "0": {
              "string": "\"is\""
            },
            "1": {
              "string": ",1"
            }
          }
        }
      }
    }
  }
}