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

A simple, localizable EachValidator for URL fields in ActiveRecord 3.0.

A Ruby library for talking to the HMRC Government Gateway. This provides a builder for creating classes that can generate the XML needed complete with type information and runtime validation.

Email Detected is a simple tool for verifying an email address exists. It's free and quite easy to use :smile: .Many times as developers we were putting validation statements for checking email addresses format. This gem will complete your existing setups with validator that actually connects wit...

An object that works with form_for that encapsulates validations and data management, leaving the business logic up to your testable old self.

pure ruby PNG file manipulation & validation

A library for making it extremely fast for Rails developers to set up and save ActiveRecord instances when writing test cases. It aims to: * meet all your validations automatically * only make you specify the attributes you care about * give you a rich set of features so you can specify associa...

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

Simple and composable validation and coercion of data structures inspired by clojure specs

Checks required env variables and its format using dotenv and .env.sample files. Sample files include validation documentation which is interpreted and used to validate your environment.

Standalone PORO assertions and validations

JSON schema validation for Rails

This ruby gem converts time of day to seconds (since midnight) and back. The value in seconds can be used for calculations and validations.

Define DSLs quickly and avoid the boilerplate write getters and setters. Oh, and it does validation too.

The Google Sign-In API gives OAuth2 JSON Web Tokens (JWT) as response data upon user sign-in. A necessary step for a service provider to trust such a token is validatation. Accepting the token without validation would allow a malicious client to simply assert itself in your system. ...

Gem includes validations, card brand detection method, etc.

ISO Schematron Validation

Parameter whitelisting for Sinatra. Provides validation, defaults, and post-processing.

DB constraints in migrations similiar to ActiveRecord validations. Core classes

Optout helps you write code that will call exec() and system() like functions. It allows you to map hash keys to command line arguments and define validation rules that must be met before the command line options are created.