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You use a form field in your model, not Django’s JSONField
model field [Django-doc]. It should be:
# models 🖟
from django.db.models import JSONField
class Area(models.model):
geojson = JSONField()
You however might be interested to work with a spatial field type [Django-doc], and take a look at django-geojson
[GitHub] for GeoJSON functionality.
Source:stackexchange.com