DavyJonesLocker / client_side_validations

Client Side Validations made easy for Ruby on Rails

adzap / validates_timeliness

Date and time validation plugin for ActiveModel and Rails. Supports multiple ORMs and allows custom date/time formats.

dry-rb / dry-validation

Validation library with type-safe schemas and rules

truemail-rb / truemail

🚀 Configurable framework agnostic plain Ruby 📨 email validator/verifier. Verify email via Regex, DNS, SMTP and even more. Be sure that email address valid and exists.

igorkasyanchuk / active_storage_validations

Do it like => validates :photos, attached: true, content_type: ['image/png', 'image/jpg', 'image/jpeg'], size: { less_than: 500.kilobytes }, limit: { min: 1, max: 3 }, aspect_ratio: :landscape, dimension: { width: { in: 800..1600 }

daddyz / phonelib

Ruby gem for phone validation and formatting using google libphonenumber library data

caxlsx / caxlsx

xlsx generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx excels at helping you generate beautiful Office Open XML Spreadsheet documents without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.