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MIME::Base64::URLSafe - Perl version of Python's URL-safe base64 codec


  use MIME::Base64::URLSafe;
  $encoded = urlsafe_b64encode('Alladdin: open sesame');
  $decoded = urlsafe_b64decode($encoded);


This module is a perl version of python's URL-safe base64 encoder / decoder.

When embedding binary data in URL, it is preferable to use base64 encoding. However, two characters ('+' and '/') used in the standard base64 encoding have special meanings in URLs, often leading to re-encoding with URL-encoding, or worse, interoperability problems.

To overcome the problem, the module provides a variation of base64 codec compatible with python's urlsafe_b64encode / urlsafe_b64decode.

Modification rules from base64:

    use '-' and '_' instead of '+' and '/'
    no line feeds
    no trailing equals (=)

The following functions are provided:


If you prefer not to import these routines to your namespace, you can call them as:

    use MIME::Base64::URLSafe ();
    $encoded = MIME::Base64::URLSafe::encode($decoded);
    $decoded = MIME::Base64::URLSafe::decode($encoded);



Fore more discussion on using base64 encoding in URL applications, see:


Kazuho Oku <kazuho ___at___>

Copyright (C) 2006 Cybozu Labs, Inc.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.7 or, at your option, any later version of Perl 5 you may have available.