const data = [ id: 1, name: "Zoë", note: "Likes \"coding\", coffee." , id: 2, name: "林", note: "Simplified Chinese char." ]; const headers = Object.keys(data[0]); const csvRows = [ headers.join(','), // Header row ...data.map(row => headers.map(fieldName => value.includes('"') ).join(',')) ].join('\r\n'); downloadCSV(csvRows, "data_export.csv"); Use code with caution. 3. Common Troubleshooting Tips UTF-8 encoding issue when exporting csv file in JavaScript
When converting an array of objects to a CSV string, you must escape characters that could break the structure, such as commas, double quotes, and line breaks. Constraint Wrap the entire field in double quotes. Double quotes in data javascript download csv utf-8
The most reliable way to ensure that special characters (like accented letters or non-Latin symbols) appear correctly in applications like Excel is to include a . Without it, Excel may default to a local ANSI encoding, causing your data to look like gibberish. Vanilla JavaScript Implementation: javascript const data = [ id: 1, name: "Zoë",
Use \r\n (CRLF) for row delimiters for maximum compatibility. javascript Constraint Wrap the entire field in double quotes
To download a CSV file in JavaScript with proper encoding, you must handle two critical factors: constructing the CSV string correctly and ensuring the browser (especially Microsoft Excel) recognizes the UTF-8 format. 1. The Core Solution: Blob with UTF-8 BOM
Replace " with "" (double quotes) and wrap the field in quotes.
function downloadCSV(csvContent, fileName) // 1. Define the UTF-8 Byte Order Mark (BOM) const BOM = "\uFEFF"; // 2. Create a Blob with the BOM and the CSV string const blob = new Blob([BOM + csvContent], type: "text/csv;charset=utf-8;" ); // 3. Create a temporary download link const link = document.createElement("a"); const url = URL.createObjectURL(blob); link.setAttribute("href", url); link.setAttribute("download", fileName); link.style.visibility = 'hidden'; // 4. Trigger the download and cleanup document.body.appendChild(link); link.click(); document.body.removeChild(link); Use code with caution. 2. Converting Data to CSV String