Data structures, validation, coercion and processing toolkit for Ruby

A Ruby library for credit card BIN validation and brand identification

Valcro is a validation library for arbitrary ruby objects. I's primary goal is to remain as simple as possible so that it can be useful to a large surface of use cases remaining easily extensible.

Provides client side validations for forms with the http://formvalidation.io/ library.

Interface to the W3C Feed Validation online service http://validator.w3.org/feed/

Custom Ruby on Rails form builder that generates GOV.UK elements styled markup for form inputs, including error validation messages.

This gem allows you to conditionally validate your models, based on where in a multi-step process the user is.

Standalone PORO assertions and validations

Token validation for distributed resource servers

An object that works with form_for that encapsulates validations and data management, leaving the business logic up to your testable old self.

It validates request params outside your controller logic in order to get a clean and nice code, and also helping with the documentation of the operations.

FlowChat is a Rails framework for building sophisticated conversational interfaces across USSD and WhatsApp platforms. Create interactive flows with menus, prompts, validation, media support, and session management. Features include multi-tenancy, background job processing, built-in simulator f...

Rack parameter validation and type coercion.

This gem can parse values, validations, documentation, types, groups and conditions of parameters from your puppet modules

A Ruby library for talking to the HMRC Government Gateway. This provides a builder for creating classes that can generate the XML needed complete with type information and runtime validation.

A small and efficient validation library for Rails and anything that uses Ruby.

Validates translated attributes accessed with globalized accessors

Rails Devs For Data Integrity catches unique key and foreign key violations coming from the MySQLdatabase and converts them into an error on the ActiveRecord object similar to validation errors

AddressValidate is a ruby wrapper for integrating with the USPS address validation api.

Optout helps you write code that will call exec() and system() like functions. It allows you to map hash keys to command line arguments and define validation rules that must be met before the command line options are created.