sessions.serializers.JSONSerializer

class serializers.JSONSerializer

A wrapper around the JSON serializer from django.core.signing. Can only serialize basic data types.

In addition, as JSON supports only string keys, note that using non-string keys in request.session won’t work as expected:

>>> # initial assignment
>>> request.session[0] = 'bar'
>>> # subsequent requests following serialization & deserialization
>>> # of session data
>>> request.session[0]  # KeyError
>>> request.session['0']
'bar'

Similarly, data that can’t be encoded in JSON, such as non-UTF8 bytes like '\xd9' (which raises UnicodeDecodeError), can’t be stored.

See the Write your own serializer section for more details on limitations of JSON serialization.