Check if the request.POST or request.GET contains the parameters it should have.

required_paramters.py

from functools import wraps
from django.http import HttpResponse

def json_response(dict_to_convert_to_json):
    return HttpResponse(json.dumps(dict_to_convert_to_json), mimetype="application/json")

def required_parameters(parameters=('email', 'api_key'), http_method='POST'):
    """
    Check if the required parameters are present in the request
    @param parameters: The names of the parameters that should be supplied
    @param http_method: Whether the parameters are present 'GET' or in 'POST'
    """
    def inner_decorator(fn):
        def wrapped(request, *args, **kwargs):
            # check if the user api_key matches
            for parameter in parameters:
                if parameter not in getattr(request, http_method):
                    return json_response({'success': False, 'errors': 'Please use the Web API correctly and supply the parameter: '+parameter})
            # Proceed like normally with the request
            return fn(request, *args, **kwargs)
        return wraps(fn)(wrapped)
    return inner_decorator