Role models are important.
-- Officer Alex J. Murphy / RoboCop
RuboCop is a Ruby static code analyzer (a.k.a. linter) and code formatter. Out of the box it
will enforce many of the guidelines outlined in the community Ruby Style
Guide. Apart from reporting the problems discovered in your code,
RuboCop can also automatically fix many of them for you.
RuboCop is extremely flexible and most aspects of its behavior can be tweaked via various
configuration options.
Working on RuboCop is often fun, but it also requires a great deal of time and energy.
Please consider financially supporting its ongoing development.
Installation
RuboCop's installation is pretty standard:
gem install rubocop
If you'd rather install RuboCop using bundler, add a line for it in your
Gemfile (but set the require option to false, as it is a standalone tool):
gem 'rubocop', require: false
RuboCop is stable between minor versions, both in terms of API and cop configuration.
We aim to ease the maintenance of RuboCop extensions and the upgrades between RuboCop
releases. All big changes are reserved for major releases.
To prevent an unwanted RuboCop update you might want to use a conservative version lock
in your Gemfile:
gem 'rubocop', '~> 1.82', require: false
See our versioning policy for further details.
Quickstart
Just type rubocop in a Ruby project's folder and watch the magic happen.
cd my/cool/ruby/project
rubocop
[!TIP]
You can also use this magic in your favorite editor with RuboCop's
built-in LSP server.
Documentation
You can read a lot more about RuboCop in its official docs.
Compatibility
RuboCop officially supports the following runtime Ruby implementations:
It targets Ruby 2.0+ for code analysis.
See the compatibility documentation for further details.
Readme Badge
If you use RuboCop in your project, you can include one of these badges in your readme to let people know that your code is written following the community Ruby Style Guide.
Here are the Markdown snippets for the two badges:
[](https://github.com/rubocop/rubocop)
[](https://rubystyle.guide)
Team
Here's a list of RuboCop's core developers:
See the team page for more details.
Logo
RuboCop's logo was created by Dimiter Petrov. You can find the logo in various
formats here.
The logo is licensed under a
Creative Commons Attribution-NonCommercial 4.0 International License.
Contributors
Here's a list of
all the people who have contributed to the development of RuboCop.
I'm extremely grateful to each and every one of them!
If you'd like to contribute to RuboCop, please take the time to go
through our short
contribution guidelines.
Converting more of the Ruby Style Guide into RuboCop cops is our top
priority right now. Writing a new cop is a great way to dive into RuboCop!
Of course, bug reports and suggestions for improvements are always
welcome. GitHub pull requests are even better! :-)
Funding
While RuboCop is free software and will always be, the project would benefit immensely from some funding.
Raising a monthly budget of a couple of thousand dollars would make it possible to pay people to work on
certain complex features, fund other development related stuff (e.g. hardware, conference trips) and so on.
Raising a monthly budget of over $5000 would open the possibility of someone working full-time on the project
which would speed up the pace of development significantly.
We welcome both individual and corporate sponsors! We also offer a
wide array of funding channels to account for your preferences
(although
currently Open Collective is our
preferred funding platform).
If you're working in a company that's making significant use of RuboCop we'd
appreciate it if you suggest to your company to become a RuboCop sponsor.
You can support the development of RuboCop via
GitHub Sponsors,
Patreon,
PayPal,
Open Collective
and Tidelift
.
[!NOTE]
If doing a sponsorship in the form of donation is problematic for your company
from an accounting standpoint, we'd recommend the use of Tidelift, where you
can get a support-like subscription instead.
Open Collective for Individuals
Support us with a monthly donation and help us continue our activities. [Become a backer]
Open Collective for Organizations
Become a sponsor and get your logo on our README on GitHub with a link to your site. [Become a sponsor]
Release Notes
RuboCop's release notes are available here.
Copyright
Copyright (c) 2012-2026 Bozhidar Batsov. See LICENSE.txt for
further details.
RuboCop 是一款面向 Ruby 的静态代码分析工具（linter）兼代码格式化工具，开箱即用就能强制执行社区的 Ruby 风格指南，同时也可以配置为执行你自己的代码风格。