Custom ActiveModel::Validations to Make Your Life Easier

Json Schema Client is a Ruby client for JsonSchema with validation and hypermedia.

Validation of popular Polish codes, such as PESEL, NIP, REGON, post codes, car registration numbers, credit card numbers and anything really that can be helpful in advanced commercial application for Polish customers.

Plinko helps you create validators that collect all validation errors instead of breaking on the first failure.

Create K-fold splits from data files and assist in training and testing (useful for cross-validation in supervised machine learning)

If you want to decouple validations from model it would be probably the easiest solution

Logstash filter plugin for Auth0 JWT validation.

Handle validation, coercion, and attributes.

Tiny plugin for MongoMapper to strip whitespace from strings before validation.

Adds the association and validation macros for Rspec in the same way Shoulda does for ActiveRecord.

An ActiveModel extension that strips tags from attributes before validation using the strip-tags helper.

JSON Data Definition Format validation for Ruby

ActiveModel::Unvalidate provides a clean api for removing existing validations from models

MySQL constraints in migrations similiar to ActiveRecord validations

Generates a Dry::Struct object from Dry::Validation::Contract schemas to avoid repetition when passing DTO's to your services.

This gem covers the generation and validation of the Portuguese Fiscal Code (or NIF). It also includes a rails custom validator.

Heavily armed validation framework.

numberjack validation lib

Provides Argentine phone number parsing, validation, formatting and meta-information.

Numero: Phone number validation for Ruby/Rails