const fixJsonStr=str=>str.replace(/(\s*?{\s*?|\s*?,\s*?)(['"])?([a-zA-Z0-9_]+)(['"])?:/g, '$1"$3":');

let zzzz=fixJsonStr(`{
    "kettty": "",
    asds: [], kggk:{},
    "ga": 222,
    "sad": {
        "zz": 0,
        "as": false,
        "gag": []
    },
    "zztt": false
}`);

console.log(JSON.parse(zzzz))