Javascript to csv export encoding issue

I need to export javascript array to excel file and download it I'm doing it in this code. data is a javascript object array. 

var csvContent = "data:text/csv;charset=utf-8,";
data.forEach(function(dataMember, index)
{
dataString = dataMember.join(",");
csvContent += index < data.length ? dataString+ "\n" : dataString;
});


var encodedUri = encodeURI(csvContent);
var link = document.createElement("a");
link.setAttribute("href", encodedUri);
link.setAttribute("download", "upload_data" + (new Date()).getTime() + ".csv");
link.click();

All this stuff works fine till I have string properties that have non-english characters, like spanish, arabic or hebrew. How can I make an export with all this non-ASCII values?

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Option 1

use iconv-lite library and encode your output to ascii before send it back to the user. Example:

var iconv = require('iconv-lite');
buf = iconv.encode(str, 'win1255'); // return buffer with windows-1255 encoding

Option 2

Write on the head of the file the BOM header of UTF-8 encoding. Example:

res.header('Content-type', 'text/csv; charset=utf-8');
res.header('Content-disposition', 'attachment; filename=excel.csv');
res.write(Buffer.from('EFBBBF', 'hex')); // BOM header


// rest of your code

Option 3

Use base64 url format like data:text/csv;base64,77u/Zm9vLGJhcg0KYWFhLGJiYg==. This method will work on client-side also (IE10+, FF, Chrome, Opera, Safari).

For example:

window.location = "data:text/csv;base64,77u/" + btoa("foo,bar\r\naaa,bbb");
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最佳答案

You should add the UTF-8 BOM at the start of the text, like:

var csvContent = "data:text/csv;charset=utf-8,%EF%BB%BF" + encodeURI(csvContent);

It worked for me with Excel 2013.

Demo Fiddle

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Excel is really bad at detecting encoding, especially Excel on OSX.

The best solution would be to encode your CSV in the default Excel encoding: windows-1252 (also called ANSI, which is basically a subset of ISO-8859-1).

I put a complete example of how to do that at: https://github.com/b4stien/js-csv-encoding.

The 2 main parts are stringencoding (to encode the content of your CSV in windows-1252) and FileSaver.js (to download the generated Blob).

It looks like:

var csvContent = 'éà; ça; 12\nà@€; çï; 13',
textEncoder = new TextEncoder('windows-1252');




var csvContentEncoded = textEncoder.encode([csvContent]);
var blob = new Blob([csvContentEncoded], {type: 'text/csv;charset=windows-1252;'});
saveAs(blob, 'some-data.csv');
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somehow found Tab-Separated-CSV with utf-16le encoding with BOM works on WIN/MAC Excel

followed b4stien's answer but make a little difference to archive:

var csvContent = 'éà; ça; 12\nà@€; çï; 13',
textEncoder = new TextEncoder('utf-16le');
var csvContentEncoded = textEncoder.encode([csvContent]);
var bom = new Uint8Array([0xFF, 0xFE]);
var out = new Uint8Array( bom.byteLength + csvContentEncoded.byteLength );
out.set( bom , 0 );
out.set( csvContentEncoded, bom.byteLength );
var blob = new Blob([out]);
saveAs(blob, 'some-data.csv');

with Linux /usr/bin/file tests:

Little-endian UTF-16 Unicode text, with very long lines, with CRLF line terminators
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B4stien, thank you to you for your answer! After testing several solutions based on charset "utf8", encoding windows-1252 is the only solution that allowed me to keep my accent in Excel 365!

Manetsus, the b4stien's answer and his link were very usefull for my case: i have to export french and german data into csv file: no solution based on "utf8" has worked... Only his solution which use an "ANSI" (window-1252) encoder...

I give his code sample, and you can download the depending encoding-indexes.js, encoding.js and FileSaver.js from the link...

    <!doctype html>
<html>


<head>
<meta charset="utf-8">
<script type="text/javascript" src="encoding-indexes.js"></script>
<script type="text/javascript" src="encoding.js"></script>
<script type="text/javascript" src="FileSaver.js"></script>
</head>


<body>
<a href="#" id="download-csv">Click me to download a valid CSV !</a>


<script type="text/javascript">
var csvContent = 'éà; ça; 12\nà@€; çï; 13',
textEncoder = new CustomTextEncoder('windows-1252', {NONSTANDARD_allowLegacyEncoding: true}),
fileName = 'some-data.csv';


var a = document.getElementById('download-csv');
a.addEventListener('click', function(e) {
var csvContentEncoded = textEncoder.encode([csvContent]);
var blob = new Blob([csvContentEncoded], {type: 'text/csv;charset=windows-1252;'});
saveAs(blob, fileName);
e.preventDefault();
});
</script>
</body>


</html>

Nevertheless, as Excel is relatively open in the support of languages and formats, I do not exclude that UTF8 is not supported in my development environment because of the way it is installed ...

Note: I test it with Firefox, Chrome and IE 11 on windows 7, with Excel 365...

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You can add the BOM at first, use this code and try

var BOM = "\uFEFF";
var csvContent = BOM + csvContent;

and then crate the file headers with the data: "text/csv;charset=utf-8"

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To export CSV containing multibyte characters and make it readable on text editor and Excel in multiple OS platforms (Windows, Linux, MacOS), the following rules should be applied:

  1. Separate the field with tab instead of comma (so that Excel on MacOS can properly display the generated CSV file)
  2. Encode the string / content with UTF-16 little endian (UTF16-LE) instead of UTF-8
  3. Add byte order mark (BOM) 0xFEFF as specified in RFC2781 section 3.2 at the beginning of the serialized stream to explicitly provide "signature" of content encoded with UTF16-LE

Further elaboration, use cases and sample code with NodeJS can be seen in this article.

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 data=`"red","मुकेश"`
var processdata = "data:text/csv;charset=utf-8,%EF%BB%BF" + encodeURIComponent(data);
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This is the solution that worked for me

Reference: Export CSV file -encoded 

var csv = 'السلام عليكم, Student name\n';
        

var hiddenElement = document.createElement('a');
//workaround to support encoding
hiddenElement.href = **'data:text/csv;charset=utf-8,%EF%BB%BF'+encodeURIComponent(csv);**


hiddenElement.download = 'Course Students Progress - ' + new Date().toLocaleString() + '.csv';
hiddenElement.click();
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It is not necessary to use the encodeURIComponent method and glue the data string snippets. Just glue the BOM character in front of the string.

const data = 'öäüÖÄÜ';
const BOM = '\uFEFF';
const blob = new Blob([BOM + data], { type: 'text/csv;charset=utf-8' });


const url = window.URL.createObjectURL(blob);
const linkElem = document.createElement('a');
linkElem.href = url;
linkElem.click();
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I've been able to solve my issue with the help of https://stackoverflow.com/a/27975629/5228251 answer

const json2csv = require('json2csv');
const csvExport = (req, res) => {
var csvContent = json2csv({ data, fields })


res.setHeader('Content-Type', 'text/csv')
// just prepend the '\ufeff' to your csv string value
return res.status(200).send('\ufeff' + csvContent)
}

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