Javascript csvToJson jsonToCsv

csv.js

const jsonToCsv = (array, separator) => {
    let result = '';
    for (const key in array[0]) {
        result.length === 0 ? result += key : result += `${separator}${key}`;
    }
    result += '\r\n';
    array.forEach(line => {
        let lineStr = '';
        for (const value in line) {
            lineStr.length === 0 ? lineStr += line[value] : lineStr += `${separator}${line[value]}`;
        }
        result += `${lineStr}\r\n`;
    });
    return result;
}

const csvToJson = (data, separator) => {
    const csvArray = data.split('\r\n').filter(Boolean);
    const keyNames = csvArray[0].split(separator);
    const dataArray = csvArray.slice(1, csvArray.length - 1);
    const result = [];
    dataArray.forEach(d => {
        let jsonEntryResult = {};
        const entries = d.split(separator);
        keyNames.forEach((keyName, idx) => {
            jsonEntryResult[keyName] = entries[idx];
        });
        result.push(jsonEntryResult);
    })
    return result;
};