Fiddler - Extensions

This page contains useful extensions for Fiddler.  For best results, please ensure that you're running the latest version of Fiddler2. 

You can develop your own extensions using the IFiddlerExtension interface.

neXpert Performance Report Generator

neXpert is an add-on to Fiddler which aids in performance testing web applications. Learn more...

Syntax-Highlighting Addons

Three popular addons for formatting FiddlerScript, HTML, Javascript XML, etc, in one installer (447 kb).

• The RulesTab2 extension is a powerful way to edit your Rules script directly within Fiddler2.
• The FiddlerScript Editor is a standalone text editor that helps you edit script rules for Fiddler.  It offers syntax highlighting and a Class Explorer to help you author scripts. 
• The SyntaxView Inspector offers syntax-highlighting for HTML, JScript, XML, and other web formats.

JavaScript Formatter

Watcher - Passive Security Auditor

Watcher is a runtime passive-analysis tool for HTTP-based Web applications. It complements static code analysis and manual security reviews by providing painless verification of operational and code-level issues at runtime. Watcher works seamlessly with today's complex Web 2.0 applications by running silently in the background while you drive your browser and interact with the Web-application.  Learn more...

SAZ Clipboard

The SAZClipboard is a simple extension that allows you to open a .SAZ file outside of the main Fiddler UI.  You can then drag sessions between this clipboard from the Fiddler UI. Learn more...

WebView Inspector

The WebView Inspector displays the response as it would be rendered by Internet Explorer's HTML rendering engine. Download now (42 kb).

Gallery

The Gallery extension displays thumbnails of all images found among the selected sessions.

RulesTab (sample)

The RulesTab extension is a lightweight way to tweak your Rules script directly within Fiddler2. This extension is not as powerful as the RulesTab2 extension above (no syntax highlighting or Intellisense), but it requires less memory.

Content-Blocking (sample)

The Content Blocker sample is a simple example of using IAutoTamper to block traffic based on URI.

Image-Flipper (sample)

The Image Flipper sample is a simple example of using IAutoTamper to automatically flip all downloaded images 180 degrees.

This list is provided for informational purposes only, and Microsoft makes no representations or warranties, either expressed, implied or statutory, regarding the items, manufacturers, or compatibility of the items available within. Some of the links below send you to sites that are not under the control of Microsoft. Microsoft is not responsible for the contents of any linked site or any link contained in a linked site or any changes or updates to such sites. Microsoft is providing these links to you only as a convenience, and the inclusion of any link does not imply endorsement of Microsoft.  Report a problem.

- Eyal has written two extensions:

• Custom Columns & Latency Extension  (now somewhat obsoleted by Custom Columns feature of Fiddler v2.2.0.5)
• JSON Inspector (with Source)