Strong parameters answer only which keys may pass. A Permittable contract also says what each field should be: it casts the value to a declared type, validates bounds and formats, applies defaults, and renders every failure as a 422 that names the offending parameter. Because a contract is class-...

Create, review, and archive retrospectives from the command line with type-aware templates, task linkage, and health checks for long-running retrospective work.

Sorbet's runtime type checking component

Enums, properties, generics, structured objects and runtime type checking.

Parse a certificate signing request or an X.509 certificate and read the useful parts safely: subject, common name, Subject Alternative Names, key type and size, and public-key fingerprints. Malformed input returns nil instead of leaking raw OpenSSL exceptions. Includes CA/Browser Forum aware wea...

# mdtoc - Markdown Table of Contents Read Markdown files and output a table of contents. ## Installation Requirements: * [Ruby](https://www.ruby-lang.org/en/) (see [.ruby-version](./.ruby-version)) ```bash gem install mdtoc ``` ## Usage ```bash mdtoc --help Usage: mdtoc [options] files or ...

Chess Move Validator verifies algebraic chess notation and identifies move types including castling, captures, checks, and promotions.

Kumi is a declarative rules-and-calculation DSL for Ruby that compiles your business logic into a typed, analyzable dependency graph with vector semantics over ragged data. It does static checks at definition time, lowers to a small IR, and compiles to zero-run...

Validate, normalize, parse, convert, generate, classify, and repair securities identifiers. Auto-detect identifier type from any string. Calculate and restore checksums. Suggest confidence-ranked corrections for fat-fingered or OCR-mangled identifiers. Generate format-valid identifiers as test fi...

Password Strength checks how strong a password is. It returns a strength label and score, a breakdown of the character types used, weak-pattern detection, theoretical entropy in bits, and recommendations to improve it.

The basic_settings gem provides a way to define settings objects that define the structure of application settings, i.e. the various fields that can be set, and their types. It provides type checking, defaults inheritance, and hierarchical structure.

Language server implementation that provides Steep-equivalent type checking features using ruby-lsp's single-process multi-threaded architecture

Extracts Ruby code from view templates (ERB, etc.) for Sorbet type-checking, with LSP support

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strong_csv is a type checker for a CSV file. It lets developers declare types for each column to ensure all cells are satisfied with desired types.

Reads .trb files, checks type annotations, and generates pure Ruby.

A tiny pre-processor for ruby that adds runtime type checking to methods.

LCN (Location Condition Notation) provides a rule-agnostic format for describing location conditions in abstract strategy board games. This gem implements the LCN Specification v1.0.0 with a modern Ruby interface featuring immutable condition objects and functional programming principles. LCN ena...

A lightweight gem that validates required environment variables at application boot time, providing type checking, format validation, and helpful error messages to prevent production disasters caused by missing or invalid configuration.

EnvCheck is a lightweight Ruby gem that ensures your required and optional environment variables are present and valid before your app boots. Features smart config discovery (.env_check.yml or config/env_check.yml), comprehensive type validation with 9 built-in validators, .env loading with doten...