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Removes invalid UTF-8 characters from the environment so that your app doesn't choke on them. This prevents errors like "invalid byte sequence in UTF-8".


Add this line to your application's Gemfile:

gem 'utf8-cleaner'

And then execute:

$ bundle

Or install it yourself as:

$ gem install utf8-cleaner

If you're not running Rails, you'll have to add the middleware to your config.ru:

require 'utf8-cleaner'
use UTF8Cleaner::Middleware


There's nothing to "use". It just works!


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request


Original middleware author: @phoet - https://gist.github.com/phoet/1336754