Generate CSV Download Link From Array

gen-csv.js

const generateHeader = (header) => {
    const newHeader = header.map(key => {
        const replacement = headerMappings[key] === undefined ? key : headerMappings[key]
        return replacement
    })

    return newHeader
}

const convertArrayOfObjectsToCSV = arrayOfObjects => {
    let result = "";
    const columnDelimiter = ",";
    const lineDelimiter = "\n";

    arrayOfObjects.map(item => {
        delete item['LastUpdated']
        delete item['id']
        return item
    })

    const keys = Object.keys(arrayOfObjects[0])
    const header = generateHeader(keys)
    result += header.join(columnDelimiter)
    result += lineDelimiter;

    arrayOfObjects.forEach(item => {
        let ctr = 0;
        keys.forEach(key => {
            if (ctr > 0) result += columnDelimiter;

            result += item[key];
            ctr++;
        });
        result += lineDelimiter;
    });

    console.log(result)

    return result;
};

export const downloadCSV = (array, csvName) => {
    const link = document.createElement("a");
    if (array.length > 0) {
        let csv = convertArrayOfObjectsToCSV(array);
        if (csv == null) return

        if (!csv.match(/^data:text\/csv/i)) {
            csv = `data:text/csv;charset=utf-8,${csv}`;
        }

        // https://stackoverflow.com/questions/37740856/javascript-createelement-does-not-work-in-ie
        document.body.appendChild(link)
        link.setAttribute("href", encodeURI(csv));
        link.setAttribute("download", csvName);
        link.click()
        link.remove()
    }
    else {
        toast.error("🔥 No rows selected!", {
            autoClose: 5000
        })
    }
};

// res is string of CSV lines separated by newline
// let res = ""
// items.forEach(data => {
// res += `${data.a},${data.b},${data.c}\n`
// })

  const link = document.createElement("a");
  document.body.appendChild(link)
  link.style = "display: none"
  const blob = new Blob([res], { type: "octet/stream" })
  const downloadurl = window.URL.createObjectURL(blob)
  link.href = downloadurl
  link.download = 'export.csv'
  link.click()
  window.URL.revokeObjectURL(downloadurl)