[Fixed]-Return a csv encoded in UTF-8 with BOM from django


Add the UTF-8 BOM to the response object before you write your data:

def render_to_csv(self, request, qs): 
  response = HttpResponse(content_type='text/csv')
  response['Content-Disposition'] = 'attachment; filename="test.csv"'

  # BOM      

  writer = csv.writer(response, delimiter=',')


StreamingHttpResponse for csv add UTF-8 BOM or \xEF\xBB\xBF

Modified from official documents

import csv
import codecs

from django.utils.six.moves import range
from django.http import StreamingHttpResponse

class Echo(object):
    def write(self, value):
        return value

def iter_csv(rows, pseudo_buffer):
    yield pseudo_buffer.write(codecs.BOM_UTF8)
    writer = csv.writer(pseudo_buffer)
    for row in rows:
        yield writer.writerow(row)

def some_streaming_csv_view(request):
    rows = (["Row {}".format(idx), str(idx)] for idx in range(65536))
    response = StreamingHttpResponse(iter_csv(rows), Echo()), content_type="text/csv")
    return response


The given answers are great but I want to give a hint how to make the official examples from the Django docs work with the UTF-8 BOM sequence of bytes at the start of the stream by only changing one line:

import itertools
import codecs 

streaming_content = itertools.chain([codecs.BOM_UTF8], (writer.writerow(row) for row in rows))
response = StreamingHttpResponse(streaming_content, content_type="text/csv")


In my case, somehow the first BOM_UTF8 character is auto removed when returned as http response. So I had to manually add TWO BOM_UTF8 characters.


I don’t know the cause of this, but maybe it will help someone, or someone who knows why may explain in the comment.

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