Parse CSV Data in Javascript

<script type="text/javascript">

fetch("data.csv")

   .then(response => response.text())

   .then((response) => {

       function csvToArray(str, delimiter = ",") {

    let array = str.split("\\r\\n").map(function (line) {

        return line.split(delimiter);

    });

    return array;

}

console.log(csvToArray(response));

console.log(csvToArray(response)[0]);

   })

   .catch(err => console.log(err))

    </script>

(5) ['time', 'data\\n\n1673454660', '40.585\n1673490660', '43.039\n1673467660', '44.926\n\n']

(2) ['time', 'data']

time,data

1673454660,40.585

1673490660,43.039

1673467660,44.926