The `Type` gem provides tools for type-validation and type-casting, and is useful for ensuring well-formed messages are passed to external APIs/

Takes the Instruction Input as Rule, parse the CSV files and applies the validation and returns valid and invalid units

Rails plugin that provides a validates_ip_format_of method to ActiveRecord models. IPs are validated by regexp. IP validation. Validate IP.

A simple gem for email validation.

EachValidator that adds a parent model's association's validation errors to the parent model

An ActiveModel validator utilizing the built in URI parse methods to provide a rich semantic API for URI validation

Allows one to implement object validations without writing too much code

Rails gem that implements an ActiveRecord validation helper called validates_as_phone_number which validates U.S. phone numbers

Validations for making ActiveRecord objects immutable.

The beginning of a validation library

Valvat_cache caches in a json file results of the VIES validation keeping it a couple of weeks

This gem unions a server-side ActiveModel password strength validation plugin with a client-side password strength estimation

Adds validation methods considering different country zip code formats. Currently, we can validate 130 countries.

Hecks JSON Schema Validations

It sure would be awesome if ActiveResource actually allowed us to do client-side validation of our ActiveResource objects like their documentation promises: http://apidock.com/rails/ActiveResource/Base

Rbdantic provides BaseModel-like data classes with field validation, type coercion, custom validators, JSON Schema generation, and serialization. Inspired by Python's Pydantic.

Add a validation headers filter to your rails controller.

Validate an email address using RFC 822 pattern match regex regular expressions

Basic document validation

Checksum validation for New Zealand IRD numbers. See http://www.ird.govt.nz/how-to/irdnumbers/ for details of what an IRD is.