Standalone PORO assertions and validations

Postgresql constraints in migrations similiar to ActiveRecord validations

A managing interface layer for handling the creation and validation of JWTs

pure ruby PNG file manipulation & validation

Interpol is a toolkit for working with API endpoint definition files, giving you a stub app, a schema validation middleware, and browsable documentation.

A wrapper for backbone.validation in the Rails asset pipeline

A Ruby API providing parsing, generation and validation of CAP(Common Alerting Protocol) messages.

Provides client side validations for forms with the http://formvalidation.io/ library.

DB constraints in migrations similiar to ActiveRecord validations. Core classes

ActiveModel/ActiveRecord validator that can wrap other validators to notify of errors so that new validations can be safely added to an existing model.

JSON schema validation for Rails

Adds validation methods to ActiveModel for validating dates and times. Works with multiple ORMS.

A validation library for ActiveRecord models that allows introspection (User.name_is_required?) and supports database normalization (aka "form input cleaning").

ISO Schematron Validation

A parser which converts dry-validation or dry-struct into valid swagger documentation

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.

xlsx spreadsheet generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx helps you create beautiful Office Open XML Spreadsheet documents ( Excel, Google Spreadsheets, Numbers, LibreOffice) without having to understand the entire ECMA spec...

Input Mask validation for ActiveModel

A Rails plugin that allows validation on partially completed Active Record models (useful in wizards that incrementally build a model).

RUT/RUN Chilean validator for Rails models