LHS ia a Rails-Gem, providing an ActiveRecord like interface to access HTTP-JSON-Services from Rails Applications. Special features provided by this gem are: Multiple endpoint configuration per resource, active-record-like query-chains, scopes, error handling, relations, request cycle cache, batc...

Handles application errors and model validations

Decode iTunes OS X and iOS receipts without remote server-side validation by using the Apple Inc Root Certificate.

Personnummer handles validation of Swedish personal identity numbers.

A development toolkit for Ruby with several small/cohesive abstractions (monads, enums, business logic, data validation...) to empower your development workflow - It's totally free of dependencies.

Opt-in validations for your ActiveRecord models based on your MySQL database constraints, including text field size, UTF-8 encoding issues, and NOT NULL constraints.

Keep your code DRY by inferring column validations from table properties! Automagically validate presence, length, numericality, inclusion and uniqueness of ActiveRecord backed columns.

Encapsulate form logic and validations in a simple object

Provide validation/generation for UPC/EAN/GTIN numbers

Headhunter is an HTML and CSS validation tool that injects itself into your Rails feature tests and automagically checks all your generated HTML and CSS for validity. In addition, it also looks out for unused (and therefore superfluous) CSS selectors.

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

Adds validation methods to ActiveModel for validating phone numbers.

Use Turnstile by Cloudflare to perform captcha validation in your Rails app

Token validation for distributed resource servers

Encapsulates FoxyCart SSO, datafeed, and cart validation protocols

A small and efficient validation library for Rails and anything that uses Ruby.

Validates translated attributes accessed with globalized accessors

RFC822 compatible email validation and MX record check

pure ruby PNG file manipulation & validation

When IBAN validation is not enough