JSON → Ruby classes

Client

Paste JSON to get attr_accessor lines with snake_case symbols and a rough type hint block—Ruby stays dynamic; refine with Sorbet or serializers for strict APIs.

Learn more: JSON and Ruby

Emit classes with `attr_accessor` and snake_case symbols—Ruby is untyped; the comment block hints at expected shapes.

Scope

For production APIs, consider Sorbet, dry-struct, or ActiveModel serializers; this page stays dependency-free and browser-side.

JSON → Ruby

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Parses JSON in your browser and emits classes inferred from the sample shape. Nested objects become nested types; arrays use the first element only to guess item shape. Nothing is uploaded.

attr_accessor is untyped; tighten with Sorbet, dry-struct, or serializers for real APIs.

Common use cases

  • Outline Ruby classes for scripts that consume JSON APIs before wiring ActiveModel or dry-struct.
  • Compare snake_case attributes with JSON keys from heterogeneous services.
  • Document sample payloads in Rails or Sidekiq job arguments.

Common mistakes to avoid

  • Expecting static typing from generated accessors alone

    Ruby remains dynamic; add Sorbet, RBS, or serializers when you need guarantees.

  • Ignoring symbol versus string key conventions

    JSON.parse uses string keys; generated symbols may need alignment with your parsing layer.

FAQ

Is Ruby generation local?

Yes. Code is produced entirely in your browser.

Does this output Hash-only helpers?

It focuses on class scaffolding. Use plain hashes or Oj if that fits your stack better.

More tools

Related utilities you can open in another tab—mostly client-side.