DSL for variable scoping / encapsulation for readability and organisation, by means of block indents and explicit variable declarations. Useful when organising complex conditions such as procs (case-in-point: complex `... if: -> {}` Rails model validations

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

Add a validation headers filter to your rails controller.

Validate an email address using RFC 822 pattern match regex regular expressions

Basic document validation

The Wechat Validator engine handles the Wechat server validation requests. 微信验证器引擎处理微信服务器的验证请求。

A gem for id and passport validation.

Language Independent Validation Rules

A JSON schema validation tool.

add description to your classes and make your ActiveRecord validations smarter

Params validations for Ruby on Rails

Compares the differences between a structure.sql file and a database and reports the inconsistencies.

RSpec matches for Mongoid models, including association and validation matchers