django bytesIO to base64 String & return as JSON

Question

I am using python 3 & I have this code, trying to get base64 out of stream and returnn as json – but not working.

       stream = BytesIO()
       img.save(stream,format='png')
       return base64.b64encode(stream.getvalue())

in my view, I have:

hm =mymap()
    strHM = hm.generate(data)
return HttpResponse(json.dumps({"img": strHM}),content_type="application/json"  )

getting error is not JSON serializable. base64.b64encode(stream.getvalue()) seems giving bytes

Asked By: user903772

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Answer 1

In Python 3.x, base64.b64encode accepts a bytes object and returns a bytes object.

>>> base64.b64encode(b'a')
b'YQ=='
>>> base64.b64encode(b'a').decode()
'YQ=='

You need to convert it to str object, using bytes.decode:

return base64.b64encode(stream.getvalue()).decode()

Answered By: falsetru

Answer 2

I think there is a simpler solution.

Simply get the bytes from the stream and pass them to b64encode.

b64encode(f.getvalue())

Output (also bytes)

b'c2VwYWwgbGVuZ3RoIChjbSksc2V...'

Answered By: Edward Gaere

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