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Pseudo IO class from/to String.

This library is based on MoonWolf version written in Ruby. Thanks a lot.

Differences to IO

  • fileno raises NotImplementedError.
  • encoding conversion is not implemented, and ignored silently.


Add this line to your application's Gemfile:

gem 'stringio'

And then execute:

$ bundle

Or install it yourself as:

$ gem install stringio


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the 2-Clause BSD License.