Javascript FileReader readAsText function not understaning utf-8 encoding characters like ä and ö

Question

I have tried searching this a lot and nothing helped me. I have an import from csv feature and javascript code reads the csv content line by line. The characters ä,ö etc are just not recognized. FileReader readAsText has default encoding utf-8 but in this case it is not for some reason working. Here is my code.

            reader = new FileReader()
            reader.onload = (e) =>
              result = e.target.result
              console.log result
              # file content
              fileContent = result.split("\r")

            reader.readAsText(e.target.files.item(0))

I have tried defining encoding like below and whatever I put there couldn't help me.

encoding = "UTF-8"
reader.readAsText(e.target.files.item(0), encoding)

In mac I only see an option 'Comma Separated Values (.csv) and that's how the csv is saved — underScorePassionFruit
– underScorePassionFruit, Commented May 25, 2015 at 17:20
Please provide us a raw ASCII sample of the saving with those characters. Or you can check yourself if it is valid UTF-8 encoding or not. — Mikko Ohtamaa
– Mikko Ohtamaa, Commented May 25, 2015 at 18:40
@MikkoOhtamaa if you mean the text, something like this is the output "Ymp�rist�oppi T�m�n puun rungon tyvi muuttuu vanhemmiten tummaksi ja pitkitt�isuurteiseksi, muuten kuori on valkoinen. Lehti on kolmiomainen ja pitk�k�rkinen ja sen laidat ovat kahteen kertaan sahalaitaiset. Vanhan puun oksat riippuvat ja n�ytt�vyytens� takia se on valittu Suomen kansallispuuksi." — underScorePassionFruit
– underScorePassionFruit, Commented May 25, 2015 at 18:50

Leolian · Accepted Answer · 2016-04-21 05:44:04Z

11

I got this to work by using ISO Latin 4 encoding.

reader.readAsText(e.target.files.item(0), 'ISO-8859-4');

That should work for you but remember to use this particular encoding just for some scandinavian characters.

answered Apr 21, 2016 at 5:44

Leolian

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1 Comment

Franco Dipre Over a year ago

In my case the ñ character didn't work out. I used encoding 'ISO-8859-3' and it worked.

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