Support Center

Burp Community

See what our users are saying about Burp Suite:

How do I?

New Post View All

Feature Requests

New Post View All

Burp Extensions

New Post View All

Bug Reports

New Post View All

Burp Suite Documentation

Take a look at our Documentation section for full details about every Burp Suite tool, function and configuration option.

Full Documentation Contents Burp Projects
Suite Functions Burp Tools
Options Using Burp Suite

Burp Extender

Burp Extender lets you extend the functionality of Burp Suite in numerous ways.

Extensions can be written in Java, Python or Ruby.

API documentation Writing your first Burp Suite extension
Sample extensions View community discussions about Extensibility
  1. Support Center
  2. BApp Store
  3. Detect Dynamic JS

Detect Dynamic JS

This extension compares JavaScript files with each other to detect dynamically generated content and content that is only accessible when the user is authenticated. This occasionally contains not only code but also data with user or session information. User/session information can then be checked for potential leakage. This extension is supposed to help hunting for exploitable situations.

To trigger the extension, simply launch a passive scan of your JavaScript files that you have requested as authenticated user. Despite being a passive scan, the extension will generate one or sometimes two request per script without cookies to get the non-authenticated version of the script.

If the same script is found to contain differing content, the extension will report an issue in the Target tab.

Requires Jython 2.7 and difflib.

More information about Dynamically Generated JavaScript and hunting for related bugs can be found on the project page:

Author Veit Hailperin
Version 0.10
Last updated 17 December 2018

You can install BApps directly within Burp, via the BApp Store feature in the Burp Extender tool. You can also download them from here, for offline installation into Burp.

You can view the source code for this BApp by visiting our GitHub page.
Follow @BApp_Store on Twitter to receive notifications of all BApp releases and updates.
Download BApp

Please note that extensions are written by third party users of Burp, and PortSwigger Web Security makes no warranty about their quality or usefulness for any particular purpose.

Go back to BappStore