Category:OWASP Encoding Project

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Web applications face any number of threats; one of them is cross-site scripting and related injection attacks. 90% of all web applications contain cross-site scripting attacks because they are easy to introduce, and the proper tools are not always available to prevent them. There is no good single library that provides all the functions required by developers to incorporate a fix into there code that will stand up to the test of time and continual research in the field. The Reform library attempts to provide a solid set of functions for encoding output for the most common context targets in web applications (e.g. HTML, XML, JavaScript, etc). The library also takes a conservative view of what are allowable characters based on historical vulnerabilities, and current injection techniques.


  • Provide tools needed by developers to mitigate canonicalization issues in web technologies.
  • Provide a solution that will not need to be patched (no security patches since release in 2004, private implementations in use since 2002).

Download (stable)

The latest code is now being maintained in a Google Code repository [1]


  • Unicode support
  • Context specific functions (HTML, XML, JavaScript, etc)
  • Many supported languages
    • Java
    • .NET v1/v2
    • PHP
    • Python
    • Perl
    • JavaScript
  • Support for AJAX
  • Conservative approach
  • Solves all current XSS techniques

Future Development

  • Ruby support
  • Java framework support
  • LDAP encoding functions
  • Add documentation on resolving XPath issues


OWASP Encoding Project Adopts Reform - 10:01, 8 November 2006 (EST)

OWASP is adopting the Reform Encoding Library as an OWASP project. We are currently in the process of moving over the source, downloads, and documentation.

OWASP Encoding Project Created! - 10:01, 8 November 2006 (EST)

The Open Web Application Security Project is proud to announce the OWASP Encoding Project!

Feedback and Participation:

We hope you find the OWASP Encoding Project useful. Please contribute to the Project by volunteering for one of the tasks, sending your comments, questions, and suggestions to To join the OWASP Encoding Project mailing list or view the archives, please visit the subscription page.

Project Contributors

Michael Eddington

Project Sponsor

Leviathan Security Group, Inc.

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