A credit card validation library to check offline validity of any AMEX, Discover, MasterCard, Visa cards using length and Luhn algorithm.

Hints for validation.

Validacity adds an extra layer of validation objects where all your validation logic can be moved to.

Adds soft validations (warnings) to ActiveModel

Mount to an endpoint of your application, give it forms fields, and it'll return the validations errors/success in JSON. Really usefull when you want to add on-unblur or before-submit validations.

Additional validations for Active Model

SA VAT number validation

displays validation errors to fields on views

Extends activerecord validations with helpers

Implement easily angular validation via form_for and form_tag helpers

Internal validations library used by the Fanforce codebase.

Declarative parameter definition and validation for Rails

Validate your ActiveAdmin resources through dry-validation

Encapsulates validations and business logic of class attributes. Currently compatible with ActiveModel validations.

Translates the validations of model to the jQuery Validator

Translates the validations of model to the jQuery Validator

emailvalidation.io provides an email validation & verification API. Automate email validation & verification without any user interaction.

Validation Tracker Client

Use database validations and convert ActiveRecord::StatementInvalid into ActiveRecord::RecordInvalid

log active model validation errors to get better insights in the usability of your forms