Fiddler (software)


Fiddler is a debugging proxy server tool used to log, inspect, and alter HTTP and HTTPS traffic between a computer and the Internet. Fiddler was originally written by Eric Lawrence while a Program Manager on the Internet Explorer development team at Microsoft.
The usage of the name “Fiddler” has broadened to encompass additional tooling provided by Progress Telerik including Fiddler Everywhere, Fiddler Core, FiddlerCap, and Fiddler Jam.

Features

Fiddler captures HTTP and HTTPS traffic and logs it for the user to review. The logging is performed by implementing man-in-the-middle interception using self-signed certificates. Fiddler can be used to edit network sessions by setting breakpoints to pause the processing of requests and permitting the alteration of the request and/or response.
Related Fiddler products provide a similar set of features, addressing additional use cases:
On 6 October 2003, Eric Lawrence released the first official version of Fiddler.
On 12 September 2012, Fiddler was acquired by Telerik and the original author joined the company to work on Fiddler on a full-time basis.
On 22 December 2015, Eric Lawrence announced he was leaving Telerik and the Fiddler project.
On 3 October 2019, Progress Telerik released version 5 of Fiddler.
On 1 June 2020, Progress Telerik released a beta version of Fiddler Everywhere.