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Convert CSV to an array of objects with with ease.

Perfect for small files of test data or small import scripts.

csv_string = "Id, Username\n 1, buren"
csv = HoneyFormat::CSV.new(csv_string)
csv.header      # => ["Id", "Username"]
user = csv.rows # => [#<struct id="1", username="buren">]
user.id         # => "1"
user.username   # => "buren"

:information_source: Supports Ruby >= 2.3, has no dependencies other than Ruby stdlib.


Add this line to your application's Gemfile:

gem 'honey_format'

And then execute:

$ bundle

Or install it yourself as:

$ gem install honey_format


By default assumes a header in the CSV file.

csv_string = "Id, Username\n 1, buren"
csv = HoneyFormat::CSV.new(csv_string)
csv.header # => ["Id", "Username"]
csv.column # => [:id, :username]

rows = csv.rows # => [#<struct id="1", username="buren">]
user = rows.first
user.id         # => "1"
user.username   # => "buren"

Custom row builder

csv_string = "Id, Username\n 1, buren"
upcase_builder = ->(o) { o.is_a?(String) ? o.upcase : o  }
csv = HoneyFormat::CSV.new(csv_string, row_builder: upcase_builder)
csv.rows # => [#<struct id="1", username="BUREN">]

Output CSV

csv_string = "Id, Username\n 1, buren"
csv = HoneyFormat::CSV.new(csv_string)
csv.rows.each { |row| row.id = nil }
csv.to_csv # => "Id, Username\n,buren\n"

Validate CSV header

csv_string = "Id, Username\n 1, buren"
# Invalid
HoneyFormat::CSV.new(csv_string, valid_columns: [:something, :username])
# => #<HoneyFormat::MissingCSVHeaderColumnError: key :id ("Id") not in [:something, :username]>

# Valid
csv = HoneyFormat::CSV.new(csv_string, valid_columns: [:id, :username])
csv.rows.first.username # => "buren"

Define header

csv_string = "1, buren"
csv = HoneyFormat::CSV.new(csv_string, header: ['Id', 'Username'])
csv.rows.first.username # => "buren"

If your header contains special chars and/or chars that can't be part of Ruby method names, things get a little awkward..

csv_string = "ÅÄÖ\nSwedish characters"
user = HoneyFormat::CSV.new(csv_string).rows.first
# Note that these chars aren't "downcased",
# "ÅÄÖ".downcase # => "ÅÄÖ"
user.ÅÄÖ # => "Swedish characters"

csv_string = "First-Name\nJacob"
user = HoneyFormat::CSV.new(csv_string).rows.first
user.public_send(:"first-name") # => "Jacob"

If you want to see more usage examples check out the spec/ directory.


Note: This gem, adds some overhead to parsing a CSV string. I've included some benchmarks below, your mileage may vary..

You can run the benchmarks yourself:

$ bin/benchmark file.csv

204KB (1k lines)

      stdlib CSV:   48.9 i/s
HoneyFormat::CSV:   34.5 i/s - 1.41x  slower

19MB (100k lines)

      stdlib CSV:   0.4 i/s
HoneyFormat::CSV:   0.3 i/s - 1.41x  slower


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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 rubygems.org.


Bug reports and pull requests are welcome on GitHub at https://github.com/buren/honey_format. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.