Fiddler Syntax-Highlighting Addons 4.6

Fiddler Syntax-Highlighting Addons

Fiddler Syntax-Highlighting Addons enhance the Fiddler web debugging experience by adding syntax-aware coloring and readable formatting to request and response bodies. The addons automatically detect common content types—such as JSON, XML, HTML, JavaScript, and CSS—so you can scan payloads quickly, understand structure at a glance, and spot issues faster.

Key capabilities:

• Syntax highlighting for popular web and API formats (JSON, XML, HTML, JavaScript, CSS, plain text)
• Pretty-printing to expand minified or compact payloads for easier inspection
• Seamless integration with Fiddler’s Inspectors and Composer for viewing and editing bodies
• Ideal for API debugging, web development, QA, and troubleshooting
• Display-only formatting that does not alter the raw traffic

Prerequisite: Requires Fiddler (Classic) to be installed.

Developer: Microsoft Corporation.

Fiddler Syntax-Highlighting Addons is developed by Microsoft. The most popular versions of this product among our users are: 2.2, 2.3 and 4.4. The names of program executable files are Fiddler.exe, FSE2.exe.