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Access SharePoint Online Data Using Postman Part 1

Admin, February 3, 2022 13412 Views

In this blog, we will show you how we can interact with SharePoint via Rest APIs and perform actions like adding, updating, deleting, and fetching data using Postman.  

We are using two operations SharePoint App Registration and Azure AD app (Graph API). 

The important factor is Authentication and Authorization while accessing SharePoint information. 

Generate ‘Client-ID’ and ‘Client-Secret’ 

 First, you need SharePoint Authentication by generating ‘Client-ID’ and ‘Client-Secret’. For that refer to “SharePoint Authentication” from the below link:

Connection to Dynamics 365 and SharePoint Authentication Using ClientId & ClientSecret: Part 2

Retrieve the Tenant ID

Now with the App registered, we are ready to access the SharePoint Online information from external system or tools.
We will retrieve the Tenant ID of SharePoint Online tenant using Postman tool. 

• Launch the Postman client. 

• Select “Get” Method for Request. 
• In the “Request URL” textbox, enter URL in this format. https://[sitename].sharepoint.com/_vti_bin/client.svc/

EXAMPLE: https://testsite.sharepoint.com/_vti_bin/client.svc/

• Navigate to the Header section. Add Key “Authorization” to send with the request and add value “Bearer”. 
• Click “Send” to submit the request. 

The response will fail with the status message “Unauthorized”. Do not worry we don’t need to fix this. From this, we just need to get “realm” and “client_id” from response header as mentioned below:

• Examine the response Header section (refer to the image below) and look for the “Authenticate” header.
• Note down below 2 values – realm and client_id
  • realm = value for the SharePoint Online Tenant Id
  • client_id = value for resource information (this value is common always)

• • Tenant ID = realm value from the previous step (highlighted in above image)
  • resource = client_id value from the previous step (highlighted in above image)

Generate the Bearer Access Token

Now we will generate the bearer access token from the Postman tool, which will be used to access the SharePoint information.

• After getting the “Tenant ID”, we will request the Access Token. To do this, use URL in the below format.

https://accounts.accesscontrol.windows.net/[Tenant ID]/tokens/OAuth/2

• Select the request as POST method.
• Apply Header configuration parameters as below.
  • Key = Content-Type
  • Value = application/x-www-form-urlencoded

• Apply Body configuration parameters as below.
  • grant_type=client_credentials
  • client_id=ClientID@TenantID
  • client_secret=ClientSecret (generated while App registration)
  • resource=resource/SiteDomain@TenantID
  • client_credentials = client_credentials (use as it, do not change)
  • ClientID@TenantID = Client ID (generated during App registration) @Tenant ID (fetched while retrieving Tenant ID) e.g. 9EDEB6D9-31AC-4354-B89C-5BEE28B33902@4D7317E1-0A2D-4274-E688-187EC0F561F2
  • ClientSecret = Client Secret generated while App registration
  • resource/SiteDomain@TenantID = 00000003-0000-0ff1-ce00-000000000000/testsite@sharepoint.com@Tenant ID (fetched while retrieving Tenant ID)            e.g., 00000003-0000-0ff1-ce00000000000000/testsite@sharepoint.com@4D7317E1-0A2D-4274-E688-187EC0F561F2

• Click “Send” to submit the request.
• Status is now shown as “200 OK” which means the connection to SharePoint online was successful using client id and client secret.
• We can now get the access token from the “Body” section from the result as shown in the below image. Copy the value of “access_token” and note for using the future steps.

Important Note – The access_token is valid only for a few hours (5 to 6 hours usually). So, you need to generate the new token regularly via clicking on the send button

Check the next part below.

Access SharePoint Online Data Using Postman Part 2

Hope this helps!

 

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