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Content Type Converter

This extension converts data submitted within requests between various common formats:

  • XML to JSON
  • Body parameters to JSON
  • Body parameters to XML

This is useful for discovering vulnerabilities that can only be found by converting the content type of a request. For example, if an original request submits data using JSON, we can attempt to convert the data to XML, to see if the application accepts data in XML form. If so, we can then look for vulnerabilities like XXE injection which would not arise in the context of the original JSON endpoint. It might also be possible to find vulnerabilities behind web application firewalls or other filters that assume the incoming data is in a specific format, while the application tolerates data in other formats.

Requires Java version 8.

Author Eric Gruber
Version 1.5
Last updated 23 January 2017

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.
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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.

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