Provides subset validation for serialized arrays or sets in Active Record

UPS address validation gem

Calls and parses various maps APIs for accurate address validation and geocoding

Array validations for Rails (e.g. Postgres jsonb columns)

A gem that handles your form and query validation in an elegant way.

Object validation library

Generate attributes with strong types and validations.

Use the familiar ActiveModel::Errors pattern for controller validations

Detects issuer from a number, has ActiveModel validations and translations support.

Validations for Non Active Record Models

ActiveModel Validation for CSS

A simple library for external validations of POROs

ActiveModel validation against duplicating records.

Uses dry-validation

A simple plugin to assist ELS token validation

Lightweight gem that utilizes Rails server-side model validations to display client-side error messages for Ajax form submissions.

Epic validator, wraps validation for HTML, JavaScript and CSS.

Simple way to do validations more clear :)

A runtime validation configuration DSL

Configurator for Ruby Applications with some validation and sugars.