This library provides a complete interface to CSV files and data. It offers tools to enable you to read and write to and from Strings or IO objects, as needed.


Add this line to your application's Gemfile:

gem 'csv'

And then execute:

$ bundle

Or install it yourself as:

$ gem install csv


require "csv"

CSV.foreach("path/to/file.csv") do |row|
  # use row here...


  • API: all classes, methods, and constants.
  • Recipes: specific code for specific tasks.


After checking out the repo, run ruby run-test.rb to check if your changes can pass the test.

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 rubygems.org.


Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/csv.

NOTE: About RuboCop

We don't use RuboCop because we can manage our coding style by ourselves. We want to accept small fluctuations in our coding style because we use Ruby. Please do not submit issues and PRs that aim to introduce RuboCop in this repository.


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

See LICENSE.txt for details.