The DynamicSchema gem provides a elegant and expressive way to define a domain-specific language (DSL) schemas, making it effortless to build and validate complex Ruby hashes. This is particularly useful when dealing with intricate configurations or interfacing with external APIs, where data ...

Parsing, conversion, and validation for dates, phonetic names, and numbers.

Client-side HTML form validations

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

Strict Phlex validation

Pattern for writing callable service objects with contract validation and error swallowing

CommandSet is a user interface framework. Its focus is a DSL for defining commands, much like Rake or RSpec. A default readline based terminal interpreter (complete with context sensitive tab completion, and the amenities of readline: history editing, etc) is included. It could very well be ad...

This library generates credit card numbers using the Luhn algorithm, suitable for testing payment systems and form validations.

Vies is a EU service that checks EU VAT business number validation and sends back its information.

A simple set of types for validation of ruby objects.

Moderate user-generated content by adding a simple validation to block bad words in any text field. Good for applications where you need to maintain a clean and respectful environment in comments, posts, or any other user input.

Integrates into Rails, allowing you to render JSON-RPC responses and validate incoming requests according to the JSON-RPC 2.0 specification. Includes middleware for strict request validation and a custom renderer. Designed for Rails 8+.

Automatically infer and create Ruby Struct-like classes from arbitrary data sources with runtime type validation

Validate your Rails forms remotely in real time using ActionCable. Also validate client side using native HTML validations and present them in a much 'prettier' format.

Convert between ISO comment sheet DOCX and structured YAML with schema validation.

A comprehensive Ruby client for interacting with the Rospatent patent search API. Features include automatic caching, request validation, structured logging, error handling, and batch operations for efficient patent data retrieval.

Limitable scans your ActiveRecord database schema for column size limits and defines corresponding model validations so that you don't have to.

A simple and lightweight parameter validation library that leverages ActiveModel to provide a clean interface for handling parameters with real and virtual fields.

A gem that seamlessly converts JSON or hashes into Ruby objects with customizable field validation, type safety, and nested object support.

A lightweight Web Function client for Ruby. Web Function is a radical rethinking of API design: no verbs, no nested URLs, no bloat. Just function calls over HTTP. This gem lets you invoke endpoints defined in a package, with full support for argument validations, error triples, and bearer auth.