ActiveModel validations for domains (including TLDs), ip addresses and email addresses with fully localization support.

JSON schema validation for Rails

A library for setting up model validations, such as in ActiveRecord.

Used to validate ContentData objects.

ruby client library for the validator.nu HTML5 validation API

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

Generate jCheck code according to ActiveModel validations

Standalone PORO assertions and validations

Full-featured type system for any ruby project. Supports custom type definition, type validation, type casting and type categorizing. Provides a set of commonly used type categories and general purpose types. Has a flexible and simplest type definition toolchain.

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.

Tiny implementation of the command pattern, including input validation, using Scrivener.

Simple actions and complex forms with validations, nesting, etc.

A Rails model validation, my first gem, just a practice work