I'm trying to read the data from my json with below format but it results with undefined

My JSON as below

```
{
    "1": "A",
    "2": "B",
    "3": "C",
    "4": "D",
    "5": "E",
    "6": "F",
    "key":"pair"    
}

```

I'm parsing as below

```
rawdata = fs.readFileSync('data.json');
data = JSON.parse(rawdata);
console.log(data.1) //returns undefined. I tried parsing 1 to String but resulted same.
console.log(data.key) //returns pair

```