JSON Swiss

JSON Swiss

JSON To Ruby Generator

Need to convert Ruby into JSON Schema?

Ruby → JSON Schema

JSON Input

Loading editor…

Generated Ruby

Configuration

Enter JSON data to generate Ruby classes

Elegant Ruby classes with framework support

How to convert JSON to Ruby – step-by-step guide

Use this JSON to Ruby generator to create Ruby classes/structs from JSON samples for Rails apps and Ruby services.

  1. Step 1 – Paste a JSON sample

    • Paste a representative JSON object or array into the left editor.
    • Include nested objects, arrays, and nullable fields so types are inferred correctly.
    • Use Import to load JSON from a file, URL, or sample data.

  2. Step 2 – Choose Ruby model options

    • Pick a root Class Name and decide whether you want plain classes or Struct-style objects.
    • Review how optional fields are handled (nilable values).
    • Confirm how nested objects become nested Ruby classes for clarity and reuse.

  3. Step 3 – Review the generated code

    • Check field names, types, and how arrays/objects are modeled.
    • Adjust options like Root Type Name, null handling, and frameworks if available.
    • If a field is inferred incorrectly, tweak your sample JSON and regenerate.

  4. Step 4 – Use the models in Ruby

    • Copy the generated classes into your app (for example app/models or lib).
    • Parse JSON and map hashes into your model objects.
    • Validate required keys before relying on them in business logic.

  5. Step 5 – Copy or download

    • Copy the output into your project or download it as a file.
    • Run your formatter/linter to match your code style.
    • Add JSON parsing/serialization libraries if your language requires them.

Quick tips

  • Keep initialization explicit to avoid silent nil bugs.
  • Prefer separate types for nested objects instead of untyped hashes when possible.
  • Use JSON Schema when you need shared contracts across services.
Example output (simplified)
# JSON input
{
  "id": 123,
  "name": "Maeve Winters",
  "email": "maeve@example.com",
  "active": true,
  "roles": ["admin", "editor"],
  "metadata": { "plan": "pro" },
  "createdAt": "2024-03-01T10:15:00Z",
  "score": 99.5,
  "notes": null
}

# Generated Ruby models (simplified)
class Metadata
  attr_accessor :plan
end

class Root
  attr_accessor :id, :name, :email, :active, :roles, :metadata, :createdAt, :score, :notes
end

Related JSON & Ruby tools

Explore more JSON and schema tools that work great alongside this JSON to Ruby generator.

Ruby Class to JSON & JSON Schema

Convert existing Ruby classes into JSON examples and JSON Schema for docs and validation.

JSON Schema Generator

Generate a JSON Schema from JSON samples to validate payloads and contracts.

JSON Formatter & Validator

Format and validate JSON before generating Ruby models to avoid runtime issues.

JSON to Python Generator

Generate Python models when you also maintain data services and scripts.

Frequently Asked Questions

What Ruby features are supported?

The generator creates Ruby classes with attr_accessor methods, supports ActiveModel serialization, and follows Ruby naming conventions with proper module structure.

Can I generate ActiveModel-compatible classes?

Yes! Select 'ActiveModel' as the framework to generate classes with ActiveModel::Serialization support for automatic JSON serialization in Rails applications.

How does Dry-Struct integration work?

When Dry-Struct framework is selected, the generator creates immutable struct classes with type checking and coercion using the dry-struct gem.

What about Ruby conventions and style?

Generated Ruby code follows standard conventions: snake_case for methods and variables, CamelCase for classes, and proper indentation with 2 spaces by default.

JSON to Ruby Class Generator Online | JSONSwiss