API call using python to Azure DevOps to get list of users in an organization

Question

I am trying to make a simple api call using Python to Azure DevOps to get list of users. URL is providing results via browser but getting error while scripting as below. I need to further proceed with the json response. Can some one help please? Python version: 3.8.3

Script

import requests
import json
response = requests.get('https://vssps.dev.azure.com/siva*****/_apis/graph/users')
print(response)
print(response.json())

**Output:**
<Response [203]>
Traceback (most recent call last):
  File "c:/Users/HP/OneDrive/Documents/github/terraform/azure-aks-kubernetes-masterclass/25-Azure-DevOps-Terraform-Azure-AKS/test.py", line 5, in <module>
    print(response.json())
  File "C:\Users\HP\AppData\Local\Programs\Python\Python38-32\lib\site-packages\requests\models.py", line 900, in json      
    return complexjson.loads(self.text, **kwargs)
  File "C:\Users\HP\AppData\Local\Programs\Python\Python38-32\lib\json\__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "C:\Users\HP\AppData\Local\Programs\Python\Python38-32\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\HP\AppData\Local\Programs\Python\Python38-32\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 3 column 1 (char 4)

This seems like an authentication issue. You haven't authenticated so the URL will redirect to a login page. That is just HTML. What does line 4 print? — JarroVGIT
– JarroVGIT, Commented Feb 6, 2021 at 9:04
@JarroVGIT Thank you. as you pointed out, authentication is the issue. It is solved now.. — Sivakumar Kayaroganam
– Sivakumar Kayaroganam, Commented Feb 7, 2021 at 4:09

Kevin Lu · Accepted Answer · 2021-02-08 01:43:18Z

2

The 203 error is Authentication error when you running the Rest API.

You could use PAT(Personal Access Token) as the Authentication method.

You could grant Graph Read scope to the PAT.

Here is the Python example:

import requests
import base64

pat = 'PAT'
authorization = str(base64.b64encode(bytes(':'+pat, 'ascii')), 'ascii')

headers = {
    'Accept': 'application/json',
    'Authorization': 'Basic '+authorization
}

response = requests.get(
    url="https://vssps.dev.azure.com/{Organization}/_apis/graph/users?api-version=6.0-preview.1", headers=headers)
print(response)

answered Feb 8, 2021 at 1:43

Kevin Lu

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1 Comment

Sivakumar Kayaroganam Over a year ago

Thank you Kevin. I have accepted the given answer

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