          value = '' if (self.value is None or self.value is False) else self.value
          return self.__class__(self._field, value, self.errors, self._prefix)
  
  
  class NestedBoundField(BoundField):
      """
      This `BoundField` additionally implements __iter__ and __getitem__
      in order to support nested bound fields. This class is the type of
      `BoundField` that is used for serializer fields.
      """
 
</s> remove     BindingDict, BoundField, NestedBoundField, ReturnDict, ReturnList
 </s> add     BindingDict, BoundField, JSONBoundField, NestedBoundField, ReturnDict,
    ReturnList
class JSONBoundField(BoundField):
    def as_form_field(self):
        value = json.dumps(self.value)
        return self.__class__(self._field, value, self.errors, self._prefix)


          value = '' if (self.value is None or self.value is False) else self.value
          return self.__class__(self._field, value, self.errors, self._prefix)
  
  
class JSONBoundField(BoundField):
    def as_form_field(self):
        value = json.dumps(self.value)
        return self.__class__(self._field, value, self.errors, self._prefix)


  class NestedBoundField(BoundField):
      """
      This `BoundField` additionally implements __iter__ and __getitem__
      in order to support nested bound fields. This class is the type of
      `BoundField` that is used for serializer fields.
      """
keep keep keep add keep keep keep keep keep keep
 PoC Add JSONBoundField to serializers (Fixes #4999)

Per issue #4999, JSONFields are not rendered properly in the DRF
browsable API HTML forms.  This patch attempts to fix that behavior by
introducing a JSONBoundField helper similar to the NestedBoundField
helper. 
rest_framework/utils/serializer_helpers.py