A gem that handles your form and query validation in an elegant way.

Provide a simple validation method and validator class for Ruby

Clean Language Validation

Providing special validation error building for has_many collection in Rails.

Validations for Non Active Record Models

ActiveModel Validation for CSS

ActiveModel validation against duplicating records.

Lightweight gem that utilizes Rails server-side model validations to display client-side error messages for Ajax form submissions.

Epic validator, wraps validation for HTML, JavaScript and CSS.

Simple way to do validations more clear :)

A runtime validation configuration DSL

Configurator for Ruby Applications with some validation and sugars.

Adds a test that validates all your Rails fixtures.

Format and validation a URL in active record

email validation

Validations, except they don't do anything.

html_pretty is yet another HTML prettifier. It purposefully does not do parsing or validation.

Hval 🐳 is hash validation gem

Custom ActiveModel::Validations to Make Your Life Easier

Provides validation and proper formatting for ISBN13 numbers.