AB#4498: Convert blog posts to articles

Author: AmandaAZ

support/entra/entra-id/app-integration/filter-fiddler-traffic-using-domain-name-client process.md

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+---
+title: Filter Fiddler traffic using domain names and client processes
+description: Introduces how to filter traffic that's captured by Fiddler using domain/host names and client processes owned by a Microsoft Entra tenant.
+ms.service: entra-id
+ms.topic: how-to
+ms.date: 04/01/2025
+ms.reviewer: bachoang, v-weizhu
+ms.custom: sap:Enterprise Applications
+---
+# Filter Fiddler traffic using domain names and client processes
+
+This article explains how to filter traffic that's captured by Fiddler using domain/host names and client processes owned by a Microsoft Entra tenant.
+
+## Prerequisites
+
+Before filtering, ensure that Fiddler is configured to capture traffic for all processes. At the bottom left corner of the Fiddler window, you can select **All processes** to change the selection.
+
+## Filter traffic using Fiddler's built-in filter feature
+
+To filter traffic using Fiddler's built-in filter feature, follow these steps:
+
+1. Open Fiddler and navigate to the right panel.
+2. Select the **Filters** tab, then check the **Use filters** box.
+3. Under the **Hosts** section, select **Show only the following Hosts**.
+4. Enter the host name list you want to filter on, separated by semicolons, for example, `localhost;login.microsoftonline.com;graph.microsoft.com`.
+
+    > [!NOTE]
+    > This text box will display a yellow background while editing the list, indicating unsaved changes.
+5. Select the **Actions** button to save the list. The background color will change to white, confirming the list is saved.
+
+Under the **Client Process** section, you can also select a specific process to filter on. This is particularly useful for filtering a standalone application. It might be less effective for capturing browser traffic because multiple processes with the same name can make it difficult to identify the correct one.
+
+## Filter traffic using JavaScript code in the OnBeforeRequest function
+
+> [!NOTE]
+> This option is used especially for browser-based applications.
+
+1. In Fiddler, go to **Rules** > **Customize Rules…**.
+2. Locate the **OnBeforeRequest** function in the script editor.
+3. Insert the following JavaScript code at the beginning of the function:
+
+    ```javascript
+    // begin filter
+    
+    // set this to false to disable filter and true to enable filter
+    var filterOn = true;
+    
+    if (filterOn)
+    {
+        // hide all requests by default
+        oSession["ui-hide"] = "true";
+        
+        // list of domain names to filter on
+        var host = ["localhost", "login.microsoftonline.com", "graph.microsoft.com"];
+        
+        // list of processes to filter on
+        var processlist = ["chrome", "microsoftedgecp", "iisexpress", "powershell"];
+    
+        for (var j = 0; j < processlist.length; j++)
+        {
+            if (oSession.LocalProcess.Contains(processlist[j]))
+            {
+                for (var i = 0; i < host.length; i++)
+                {
+                    if (oSession.HostnameIs(host[i]))
+                    {
+                        oSession["ui-hide"] = null;
+                    }
+                }
+            }
+        }
+    }
+    
+    // end filter
+    ```
+
+    Here are explanations for some variables in the JavaScript code:
+
+    - `filterOn`: Set it to `true` to enable the filter and `false` to disable it.
+    - `host`: Contains the list of domain names to filter on.
+    - `processlist`: Contains the list of process names to filter on.
+
+4. Save the changes to the script file.
+
+## References
+
+- [Modifying a Request or Response](http://docs.telerik.com/fiddler/KnowledgeBase/FiddlerScript/ModifyRequestOrResponse)
+- [FiddlerScript Cookbook](http://fiddlerbook.com/Fiddler/dev/ScriptSamples.asp)
+- [Understanding FiddlerScript](https://www.telerik.com/blogs/understanding-fiddlerscript)
+
+[!INCLUDE [Azure Help Support](../../../includes/azure-help-support.md)]