[Answer]-How to get a name value from a foreign key of a Json object

You can use Django’s natural keys or construct the JSON object yourself. The latter is fine, in this case, since it is a small model and you don’t need to deserialize it. An example code (untested):

from json import json

def subscribed(request):
    subscribedplan = SubscribePlan.objects.filter(user=request.user)[0]
    json_obj = [{"plan": subscribedplan.plan.name }, ]

    return HttpResponse(json.dumps(json_obj))

Would recommend a more complete package like django-angular for better integration.