Whitelist and typecheck your parameters at the controller level

Type checking and type casting of parameters for Action Pack

Sorbet's runtime type checking component

Flags is a framework for Ruby which allows the definition of command-line flags, which are parsed in and can be accessed smartly from within your Ruby code. This framework allows for numerous different flag types, and takes care of the process of type conversion and flag validation (type and val...

MooseX is an extension of Ruby object DSL. The main goal of MooseX is to make Ruby Object Oriented programming easier, more consistent, and less tedious. With MooseX you can think more about what you want to do and less about the mechanics of OOP. It is a port of Moose/Moo from Perl to Ruby world...

A type coercion lib works with Sorbet's static type checker and type definitions; raises an error if the coercion fails.

A gem that provides DSL for serialization of plain old Ruby objects to JSON in a declarative style by defining a `schema`. It also provides a trivial type checking in the runtime before serialization.

a Rails gem that allows you to validate a URL entered in a form. It validates if the URL exists by hitting it with a HEAD request. The improved version includes retries for common patterns when the head request is refused before giving a failure notice. It also looks up a SITE_URL constant to...

This gem allows you to check the Content-Type of any HTTP-accessible asset.

Makes sure users don't accidentally create an account for the wrong e-mail address. Because 'gmial' isn't actually what they meant to type. Similarly, 'yaho.com', or the strange-but-true '.c0m'. Not even making that one up. If you're concerned about false-positives, it's super-easy to check. Ther...

Type checking for Ruby methods.

The MessageMedia Lookups API provides a number of endpoints for validating the phone numbers you’re sending to by checking their validity, type and carrier records.

Pronto runner for Sorbet, a static type checker for Ruby

Typecheck sugar for Ruby.

Ruby mixin that facilitates English-like type checking in an inheritance hierarchy via "type_name?" methods

Type check JSON objects

Only 70 lines. Add a optional type system to ruby using runtime checks and contracts . make it crash early, know exactly what a function (or method) returns and specify the 'type' of the parameters using good old ducktyping

Run-time type checker and transformer for Ruby

Library which allows you to check and sanitize you environment variables, raising exception if required variables are not configured, type-casting non-string variables and exposing them using an idiomatic API.

A dynamic type checker for gRPC methods