This will solve the problem:
const json_data = {"2013-01-21":1,"2013-01-22":7};
const arr = Object.keys(json_data).map((key) => [key, json_data[key]]);
console.log(arr);
Or using Object.entries() method:
console.log(Object.entries(json_data));
In both the cases, output will be:
/* output:
[['2013-01-21', 1], ['2013-01-22', 7]]
*/