Typelizer

Typelizer generates TypeScript types, route helpers, and OpenAPI schemas from your Ruby on Rails application. It keeps your backend and frontend in sync without hand-maintaining types.

• Automatic TypeScript interface generation from serializers
• Type-safe route helpers from Rails routes
• Supports Alba, ActiveModel::Serializer, Oj::Serializer, Panko::Serializer
• OpenAPI 3.0/3.1 schema generation
• Multiple output writers with layered configuration
• File watching with automatic regeneration in development

Add to your Gemfile:

gem "typelizer"

Include the DSL in your serializers:

class ApplicationResource
  include Alba::Resource
  include Typelizer::DSL
end

class PostResource < ApplicationResource
  attributes :id, :title, :body
end

Generate TypeScript types:

rails typelizer:generate

Full documentation: https://typelizer.dev

• Getting Started
• Manual Typing
• Route Helpers
• Configuration
• Type Mapping

Typelizer is inspired by types_from_serializers, js-routes, and Wayfinder.

The gem is available as open source under the terms of the MIT License.