Welcome to FiddlerCore

Thank you for choosing Progress® Telerik® FiddlerCore!

What Is FiddlerCore and Why Do I Need It?

FiddlerCore is a .NET class library you can integrate into your .NET applications. The latest version targets .NET Standard 2.1 and can be used on Windows, Linux, Mac, and other platforms that implement .NET Standard. Support for .NET Framework 4.8 and earlier is available only in older FiddlerCore versions.

FiddlerCore allows you to capture and modify HTTP and HTTPS traffic just like Fiddler Everywhere, without any of the Fiddler user interface.

Features at a Glance

• HTTP and HTTPS traffic capture and modification.
• Powerful object model for content filtering and modification.
• Store and reload web traffic.
• Support for virtually any client application.
• Support for most devices via mobile proxy settings.

Next Steps

First steps with FiddlerCore Using API Key to get FiddlerCore from Nuget Basic FiddlerCore configuration Capturing HTTPS traffic with FiddlerCore