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

Validate custom ruby objects using validation defined in the class

CPF validation for ActiveModel and Rails

Tracks each validation error, providing an aggregate to identify UI issues

Ardm fork of dm-validations

Ruby Library for the numverify API, Global Phone Number Validation & Lookup, https://numverify.com/

Serializes ActiveRecord validations into JSON for use by rich-client apps.

Hints for validation.

Simple client side validation that keeps validation in the models

slim-template format validation.

Isolate and automate your Rails validations.

displays validation errors to fields on views

ActiveRecord uniqueness validations without raceconditions

Perform validation on your node's attributes from a Cookbook's attribute metadata definitions.

date validation

Adds active-record validations to a json format (to_arson) so that validations can be performed client side.

UseCase Gem Extention to add Rails like validations

Server side validations for ember.js framework, model agnostic

Handles rails validation errors foundation's way

Default validations for string and integer attributes