SharePoint Developer Tools: How to Test & Debug SharePoint REST API Endpoints (GET Requests)

In this article we will understand how utilize a famous developer productivity tool called fiddler as REST API Test Client for SharePoint (though the target system could be anything with a valid REST API Endpoint)

Fiddler is primarily used as a Web Proxy that can allow you intercept REST API Request – Response Cycle. The usage of this tool has increase with shift in modern SharePoint development paradigms that favors more if Client Side Development Techniques/Strategies/Platforms rather than traditional Farm Solutions.

In this upcoming section of this article I will guide on how to use Fiddler to test REST API Call against SharePoint Data.

In this article we will explore only GET type of Requests only.

To start with this demo launch Fiddler and go to “Rules” Menu and Select “Automatically Authenticate”, this will let Fiddler to authenticate you against SharePoint based on the User Token stored once.


If this setting is not enabled you might encounter “401 UNAUTHORIZED” as shown below-


Also notice the request headers that are required to execute the SharePoint REST API Endpoint

GET Requests

http://<Host Name>/_api/<SharePoint Endpoint>

Request Headers
Accept: application/json;odata=verbose
Content-Type: application/json;odata=verbose

Get Web Object

http://<Host Name>/_api/web

  • Click on “Compose” Tab
  • Select request type as “GET” from dropdown
  • Specify the Request URL as http://<Host Name>/_api/web
  • Click on “Execute” Button


Once the request is issued using Fiddler “Composer“, we can see the request details in the left pane


When you click on the request in the left pane we can see the details breakdown in the Right Pane

For instance we can click on “Inspectors” tab and then click on “JSON” tab.

JSON Tab will display the response received from SharePoint in JSON Format.


Similarly we can execute other GET Requests as shown in upcoming Screen Shots-

Get List Object

http://<Host Name>/_api/Web/Lists



Get Lists which are not hidden and have Items

http://<Host Name>/_api/Web/Lists?$select=Title,Hidden,ItemCount&orderby=ItemCount&$filter=((Hidden eq false) and (ItemCount gt 0))

Encoded Version of Request URL

http://<Host Name>/_api/Web/Lists?$select=Title,Hidden,ItemCount&orderby=ItemCount&$filter=((Hidden%20eq%20false)%20and%20(ItemCount%20gt%200))



Get Web filtered by Title

http://<Host Name>/_api/Web/?$select=Title



Get Web and Lists using Look Properties Expanding Lists Collection

 http://<Host Name>/_api/Web/?$select=Title,Lists/Title,Lists/Hidden,Lists/ItemCount&$expand=Lists



Get Web and Lists using Look Properties Expanding Users Collection




That is all for this demo.

Hope you find it helpful.

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