Convert queryset to JSON for use with javascript

queryset2js.py.js

Using the JSONEncoder from: https://github.com/bradjasper/django-jsonfield/blob/master/jsonfield/encoder.py

def get_context_data(self, **kwargs):
    ctx = super().get_context_data(**kwargs)
    tl = Model.objects.filter(year=self.kwargs['year']).values()
    ctx['jsonstring'] = json.dumps(tl, cls=JSONEncoder)
    return ctx

Then in the template:
    var json_data = {{ jsonstring|safe }};