This gem validates .env variables. You can configure validation rules by adding the appropriate comments to the .env.sample file.

Add the gem to your gemfile:

gem "dotenv_validator", github: "fastruby/dotenv_validator", branch: :main

Call DotenvValidator.check! in an initializer:

echo "DotenvValidator.check!" > "config/initializers/1_dotenv_validator.rb"

Note the 1_ in the name so it's executed before any other initializer, since initializers are run in alphabetical order.

You can use DotenvValidator.check without the ! to show warnings instead of raising an exception.

At the moment it is only available on Github, so you would need to run:

bundle update --source dotenv_validator

In your .env.sample file, you can add comments to tell DotenvValidator how to validate the variable:

MY_REQUIRED_VAR=value #required
THIS_IS_AN_OPTIONAL_INT=123 #format=int
THIS_IS_A_REQUIRED_EMAIL=123 #required,format=email

• int or integer
• float (note that all integers are floats too)
• str or string (accepts anything)
• email (checks value against /[\w@]+@[\w@]+\.[\w@]+/)
• url (checks value against /https?:\/\/.+/)
• any other value acts as a regexp!

If you have a complex format, you can use a regexp for validation:

MY_WEIRD_ENV_VAR=123_ABC #required,format=\d{3}_\w{3}

In the above example, \d{3}_\w{3} is converted to a regexp and the value is checked against it.

Want to make your first contribution to this project? Get started with some of our good first issues!

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

When Submitting a Pull Request:

• If your PR closes any open GitHub issues, please include Closes #XXXX in your comment

• Please include a summary of the change and which issue is fixed or which feature is introduced.

• If changes to the behavior are made, clearly describe what changes.

• If changes to the UI are made, please include screenshots of the before and after.

dotenv_validator is maintained and funded by FastRuby.io. The names and logos for FastRuby.io are trademarks of The Lean Software Boutique LLC.