Python3, json causes TypeError but simplejson doesn't

Question

I'm running the latest Python3 (with the Anaconda distribution) and have a problem with the standard library installed json which causes the Traceback:

    Traceback (most recent call last):
      File "C:\Users\Think\Anaconda3\lib\site-packages\werkzeug\serving.py", line 193, in run_wsgi
        execute(self.server.app)
      File "C:\Users\Think\Anaconda3\lib\site-packages\werkzeug\serving.py", line 181, in execute
        application_iter = app(environ, start_response)
      File "C:\Users\Think\my_server.py", line 148, in __call__
        return self.wsgi_app(environ, start_response)
      File "C:\Users\Think\my_server.py", line 144, in wsgi_app
        response = self.dispatch_request(request)
      File "C:\Users\Think\my_server.py", line 80, in dispatch_request
        return getattr(self, 'on_' + endpoint)(request, **values)
      File "C:\Users\Think\my_server.py", line 54, in on_xapi_request
        json_data = self.load_json(request.data)
      File "C:\Users\Think\my_server.py", line 60, in load_json
        return json.loads(data)
      File "C:\Users\Think\Anaconda3\lib\json\__init__.py", line 312, in loads
        s.__class__.__name__))

TypeError: the JSON object must be str, not 'bytes'

But, simplejson doesn't cause the error.

You are only making statement. This is a Q&A site, it helps to put an interrogative sentence in your posts, so we don't have to guess what the question might be. — Anthon
– Anthon, Commented Sep 7, 2016 at 18:30

Morishiri · Accepted Answer · 2016-09-07 18:37:47Z

1

Use str.decode('utf-8') before passing to json.loads

I think this line:

return json.loads(data)

is causing the problem. Decode data before passing it to this function.

edited Sep 7, 2016 at 18:37

answered Sep 7, 2016 at 18:30

Morishiri

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2 Comments

Dartmouth Over a year ago

Just using return json.loads(data.decode("utf-8")) works too and is more concise.

Henry Thornton Over a year ago

That did it. Many thanks. It is weird that simplejson worked and json didn't. I'm guessing it's because python3 is strict about str and bytes but simplejson isn't.

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