Free online JSON to Ruby class code generator. Convert JSON data to Ruby Class or Struct code instantly. Supports snake_case naming, to_json/from_json methods. Pure frontend, no server upload.
The JSON to Ruby Class Generator is a free online tool that helps Ruby developers quickly convert JSON data into Ruby Class or Struct code. No need to manually write class definitions and serialization methods — paste JSON and auto-generate complete code with snake_case naming. Pure frontend, no data uploads.
Generate Ruby classes from JSON API responses with to_json/from_json for automatic serialization.
Map JSON configs to Ruby Structs for type-safe config access.
Quickly generate Ruby class prototypes that can later migrate to ActiveRecord models.
Ruby Struct is a lightweight data container ideal for simple value objects. Class is better for objects requiring custom logic. The Ruby community recommends snake_case naming; JSON camelCase fields should be converted. Rails offers jbuilder and active_model_serializers for more powerful JSON serialization. Dry-struct is a type-safe alternative to Struct with type checking and validation.
Supports String, Integer, Float, Boolean, Array, Hash, NilClass and other Ruby native types. Nested objects map to Hash or independent classes, arrays to Array.
Yes. Choose Ruby Struct (lightweight data container) or full Class definition (with initialize, to_json, from_json methods). Struct for simple data, Class for complex logic.
Yes. Generated code follows standard Ruby syntax with necessary require statements. Copy to a .rb file and run — no extra dependencies needed (except the json library.
JSON camelCase or snake_case field names are automatically converted to Ruby's conventional snake_case style.
Completely secure. All processing runs locally in your browser. JSON data never leaves your device.
Yes. Class mode auto-generates self.from_json class method for creating instances from JSON strings. Struct mode can use JSON.parse directly.