What does this django error mean? JSONDecodeError at '/url-path/' Expecting value: line 1 column 1 (char 0)

I frequently encounter this problem when using Django and Python in general; it seems to occur everytime I attempt to make an api call or other similar operation.

I am trying to onboard users to PayPal in this case utilizing the PayPal “Referral API,” and after following the documentation, I came up with the following code.

def onboard_seller_view_2(request):
    # Retrieve seller's information from the request
    seller_name = request.POST.get('name')
    seller_email = request.POST.get('email')
    # Call PayPal's Partner Referral API to retrieve the redirect URL
    headers = {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer A21AAJnuaq****'
    }
    data = {
        'operation': 'API_INTEGRATION',
        'productIntentId': 'PAYMENT',
        'partnerConfiguration': {
            'partnerId': 'EUKJ***',
            'features': ['PAYMENT', 'REFERRAL'],
            'integrationMethod': 'PAYPAL'
        },
        'collectedConsent': {
            'trackingId': 'wrweijweirnemdfioweworuwer',
            'consentShared': True
        },
        'webExperience': {
            'partnerLogoUrl': 'https://img.freepik.com/free-vector/gradient-quill-pen-design-template_23-2149837194.jpg?w=2000',
            'userExperienceFlow': 'FULL',
            'returnUrl': '/vendor/vendor_payout_update/',
            'returnUrlDescription': 'Return to seller dashboard'
        },
        'partnerLogoUrl': 'https://img.freepik.com/free-vector/gradient-quill-pen-design-template_23-2149837194.jpg?w=2000',
        'flowConfig': {
            'landingPageType': 'BILLING',
            'bankTxnPendingUrl': '/vendor/vendor_payout_update/',
            'bankTxnSuccessUrl': '/vendor/vendor_payout_update/',
            'bankTxnFailedUrl': '/vendor/vendor_payout_update/'
        },
        'accountInfo': {
            'emailAddress': seller_email,
            'name': {
                'givenName': seller_name.split()[0],
                'surname': seller_name.split()[-1]
            }
        }
    }
    response = requests.post('https://api.paypal.com/v1/partner-referrals/referral/', headers=headers, json=data)
    # Redirect the seller to PayPal's onboarding flow
    
    return redirect(response.json()['links'][0]['href'])

then i have a form to get the user’s name and email

<form method="post" action="{% url 'vendor:onboard_seller_view_2' %}">
    {% csrf_token %}
    <label for="name">Name:</label>
    <input type="text" id="name" name="name">
    <label for="email">Email:</label>
    <input type="email" id="email" name="email">
    <input type="submit" value="Submit">
</form>

when i hit the submit button, i get this error

JSONDecodeError at /vendor/onboard_seller_view_2/
Expecting value: line 1 column 1 (char 0)

I am truly seeking to understand what I’m doing incorrectly, or perhaps what I’m missing, and I also want to understand what would be causing this kind of problem.

It would help if you post the complete traceback.

I’ll take a guess and say that the line throwing this error is this one:

If it is, then it’s a situation where your response isn’t what you think it is.

Your code is assuming that response is always going to return valid json data - you’re not performing any error checking or validation of that response.

This is the complete traceback

Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
May 13, 2023 - 19:50:50
Django version 3.2.18, using settings 'ecommerce_prj.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
[13/May/2023 19:53:07] "GET /vendor/vendor_payout_update/ HTTP/1.1" 200 20113
Not Found: /vendor/vendor_payout_update/css/responsive.css
[13/May/2023 19:53:07] "GET /vendor/vendor_payout_update/css/responsive.css HTTP/1.1" 404 19829
Internal Server Error: /vendor/onboard_seller_view_2/
Traceback (most recent call last):
  File "C:\Users\pcFranks\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\requests\models.py", line 971, in json
    return complexjson.loads(self.text, **kwargs)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.7_3.7.2544.0_x64__qbz5n2kfra8p0\lib\json\__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.7_3.7.2544.0_x64__qbz5n2kfra8p0\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.7_3.7.2544.0_x64__qbz5n2kfra8p0\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\pcFranks\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "C:\Users\pcFranks\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\pc/Desktop\ZeoMart_Ecommerce\vendor\views.py", line 1619, in onboard_seller_view_2
    return redirect(response.json()['links'][0]['href'])
  File "C:\Users\pcFranks\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\requests\models.py", line 975, in json
    raise RequestsJSONDecodeError(e.msg, e.doc, e.pos)
requests.exceptions.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
[13/May/2023 19:53:21] "POST /vendor/onboard_seller_view_2/ HTTP/1.1" 500 117304

please, what are the ways that i can use to perform error checks?

Things you might want to check in the response before returning

  • The http response code. It should probably be a 200. (It might be something else, the documentation for the API should tell you what it’s supposed to return.

  • That response.json() doesn’t throw an error and does return (in this case) a dict

  • That the dict returned has a key named ‘links’ and contains a list.

  • That the first element of the list returned is a dict, containing a key named ‘href’

  • That the key named ‘href’ contains a string that can be used in a redirect

Those are all things that you could check to ensure that the redirect works - but then you need to figure out what you’re going to do if any of those tests fail.

1 Like

I’m not able to see any response printed in my terminal becuase of the error, so i tried making a post request to the api using postman and i’m getting a 403 Error.
This is a screenshot

could this be what’s causing the error?
Is there a way to see responses printed to my terminal while getting the json decode error?

try:
    response = requests.post('https://api.paypal.com/v1/partner-referrals/referral/', headers=headers, json=data)
except Exception as e:
    print(e)
    # Redirect the seller to PayPal's onboarding flow

@k4ml The error is being thrown in the return redirect line, not the requests.posts line. This try/except block isn’t going to provide any useful information.

The error happened in redirect because he try to read the json response there. And he’s asking how to verify if he get the same error as he’s getting in his postman request. Ok, the request won’t throw any exception, so add another error checking then:-

try:
    response = requests.post('https://api.paypal.com/v1/partner-referrals/referral/', headers=headers, json=data)
except Exception as e:
    print(e)
    # Redirect the seller to PayPal's onboarding flow

if response.status_code != 200:
    print(response)

Or just use raise_for_status:-

try:
    response = requests.post('https://api.paypal.com/v1/partner-referrals/referral/', headers=headers, json=data)
except Exception as e:
    print(e)
    # Redirect the seller to PayPal's onboarding flow

response.raise_for_status()
return redirect(response.json()['links'][0]['href'])