[Answer]-Why does JSON-encoded POST data appear in raw_post_data but not POST

request.POST is meant to access conventional html form data, and request.body for all other formats (xml, json, etc.). raw_post_data is deprecated in newer django versions, it’s successor is request.body. Also, you would have to deserialize the incoming json data before accessing it even through request.body , e.g.: json.loads(request.body)

More information can be found about both HttpRequest.body and HttpRequest.POST in the official documentation:
https://docs.djangoproject.com/en/dev/ref/request-response/#django.http.HttpRequest.body