1. Support Center
  2. BApp Store
  3. JSON Web Tokens
Professional Community

JSON Web Tokens

JSON Web Tokens (JWT4B) lets you decode and manipulate JSON web tokens on the fly, check their validity and automate common attacks.


  • Automatic recognition
  • JWT Editor
  • Resigning of JWTs
  • Signature checks
  • Automated attacks available such as "Alg None" & "CVE-2018-0114"
  • Validity checks and support for 'expires', 'not before', 'issued at' fields in the payload
  • Automatic tests for security flags in cookie transmitted JWTs
Author Oussama Zgheb & Mathias Vetsch
Version 2.2
Last updated 21 February 2022

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