JSONDecodeError: Expecting value: line 1 column 1 (char 0)

I am getting error Expecting value: line 1 column 1 (char 0) when trying to decode JSON.

The URL I use for the API call works fine in the browser, but gives this error when done through a curl request. The following is the code I use for the curl request.

The error happens at return simplejson.loads(response_json)

        response_json = self.web_fetch(url)
        response_json = response_json.decode('utf-8')
        return json.loads(response_json)

    def web_fetch(self, url):
            buffer = StringIO()
            curl = pycurl.Curl()
            curl.setopt(curl.URL, url)
            curl.setopt(curl.TIMEOUT, self.timeout)
            curl.setopt(curl.WRITEFUNCTION, buffer.write)
            response = buffer.getvalue().strip()
            return response

Full Traceback:


    File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
      111.                         response = callback(request, *callback_args, **callback_kwargs)
    File "/Users/nab/Desktop/pricestore/pricemodels/views.py" in view_category
      620.     apicall=api.API().search_parts(category_id= str(categoryofpart.api_id), manufacturer = manufacturer, filter = filters, start=(catpage-1)*20, limit=20, sort_by='[["mpn","asc"]]')
    File "/Users/nab/Desktop/pricestore/pricemodels/api.py" in search_parts
      176.         return simplejson.loads(response_json)
    File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/__init__.py" in loads
      455.         return _default_decoder.decode(s)
    File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in decode
      374.         obj, end = self.raw_decode(s)
    File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in raw_decode
      393.         return self.scan_once(s, idx=_w(s, idx).end())

    Exception Type: JSONDecodeError at /pricemodels/2/dir/
    Exception Value: Expecting value: line 1 column 1 (char 0)

To summarize the conversation in the comments:

  • There is no need to use simplejson library, the same library is included with Python as the json module.

  • There is no need to decode a response from UTF8 to unicode, the simplejson / json .loads() method can handle UTF8 encoded data natively.

  • pycurl has a very archaic API. Unless you have a specific requirement for using it, there are better choices.

requests offers the most friendly API, including JSON support. If you can, replace your call with:

    import requests

    return requests.get(url).json()

From: stackoverflow.com/q/16573332