let json = 

  {

    "123":{

      "name":"someName",

      "age":"12",

      "health":{

        "heart":"OK",

        "lungs":"Not so good"

      }

    },

    "223": {

      "name":"someName1",

      "age":"42",

      "health":{

        "heart":"Not so good",

        "lungs":"OK"

      }

    }

  }

​

let l = Object.keys(json)

console.log(l.length)

​

for(let i = 0; i < l.length; i++){

  let element = json[l[i]];

  let modulo = i % 2 === 0 ? " modulo 0 " : " modulo 1 "

  console.log(`id=${i}, ${element.name}, ${modulo}, ${element.health.lungs}`);

}

​