- Paste or upload your raw JSON data into the input editor.
- Enter a 'Root Class Name' for the top-level object (e.g., User, ApiResponse).
- (Optional) Provide a 'Module Namespace' to wrap your generated classes (e.g., Stripe::Responses).
- Select your preferred 'Ruby class structure' from the dropdown options (e.g., Standard Class with attr_accessor, ActiveModel::Model, or Struct).
- Click the 'Generate' button to process the JSON.
- Copy the generated Ruby code and paste it directly into your project.
JSON to Ruby Classes
JSON to Ruby Classes tool on AzWebTools.
Result
Fill inputs and click run.
How to Use This Tool
Learn More About JSON to Ruby Classes
Integrating JSON with Ruby
Ruby's standard library includes the json module, making it incredibly easy to parse JSON strings into Ruby Hashes using JSON.parse(string). However, working with raw Hashes in a large Ruby codebase or Ruby on Rails application can lead to scattered logic, typos, and a lack of clear object interfaces. Converting JSON payloads into dedicated Ruby classes provides necessary encapsulation, behavior abstraction, and improved code readability.
Popular Ruby Data Structures for JSON
- Standard Classes (`attr_accessor`): This generates a basic Ruby class with read and write accessors for each JSON key. It is excellent for simple, mutable data objects.
- Struct:
Structis a built-in Ruby core class generator that bundles a number of attributes together. UsingStruct.newwithkeyword_init: trueallows you to easily initialize objects directly from parsed JSON Hashes. - ActiveModel::Model: Highly prevalent in the Ruby on Rails ecosystem. By including
ActiveModel::Model, plain Ruby classes gain powerful Rails features like validations, initialization with a hash of attributes, and standard lifecycle callbacks.
Why Automate the Conversion?
Manually typing out attr_accessor definitions or ActiveModel initializers for deeply nested JSON payloads from a third-party API is tedious and prone to human error. Using an automated generator allows developers to instantly traverse the JSON tree, recursively building the necessary parent and child classes, and mapping out arrays and nested objects accurately in seconds.
The Intersect of JSON and Ruby
JSON (JavaScript Object Notation) was popularized in the early 2000s by Douglas Crockford as a lightweight data-interchange format. Ruby, designed by Yukihiro "Matz" Matsumoto in the mid-1990s, is a dynamic, open-source programming language focused on simplicity and developer productivity. The rapid rise of the Ruby on Rails framework closely intersected with the growing adoption of JSON for RESTful web APIs.
Ruby's elegant syntax combined with JSON's straightforward structure makes parsing data and generating objects a seamless experience for modern web developers.
- Ruby Creator
- Yukihiro Matsumoto
- JSON Standard
- RFC 8259
Examples
Rails API Response (ActiveModel)
Runtime-verified example for json-to-ruby-classes
Input
{"jsonInput":"{\"status\":\"success\", \"user\":{\"id\":1, \"email\":\"[email protected]\"}, \"tags\":[{\"id\":10, \"name\":\"ruby\"}]}","rootClassName":"ApiResponse","moduleNamespace":"Api::V1","classFormat":"ActiveModel::Model"}Output
{
"jsonInput": "{\"status\":\"success\", \"user\":{\"id\":1, \"email\":\"[email protected]\"}, \"tags\":[{\"id\":10, \"name\":\"ruby\"}]}",
"rootClassName": "ApiResponse",
"moduleNamespace": "Api::V1",
"classFormat": "ActiveModel::Model"
}Ruby 3.2 Immutable Data
Runtime-verified example for json-to-ruby-classes
Input
{"jsonInput":"{\"id\": 1, \"name\": \"Project X\", \"active\": true}","rootClassName":"Project","moduleNamespace":"","classFormat":"Data.define (Ruby 3.2+)"}Output
{
"jsonInput": "{\"id\": 1, \"name\": \"Project X\", \"active\": true}",
"rootClassName": "Project",
"moduleNamespace": "",
"classFormat": "Data.define (Ruby 3.2+)"
}Sample Scenario
Runtime-verified example for json-to-ruby-classes
Input
{"jsonInput":"{\n \"id\": 123,\n \"title\": \"Sample Post\",\n \"author\": {\n \"name\": \"Jane Doe\",\n \"verified\": true\n },\n \"comments\": [\n {\n \"id\": 1,\n \"body\": \"Great post!\"\n }\n ]\n}","rootClassName":"Post","moduleNamespace":"Responses","classFormat":"ActiveModel::Model"}Output
{
"jsonInput": "{\n \"id\": 123,\n \"title\": \"Sample Post\",\n \"author\": {\n \"name\": \"Jane Doe\",\n \"verified\": true\n },\n \"comments\": [\n {\n \"id\": 1,\n \"body\": \"Great post!\"\n }\n ]\n}",
"rootClassName": "Post",
"moduleNamespace": "Responses",
"classFormat": "ActiveModel::Model"
}Use Cases
- Generating Data Transfer Objects (DTOs) for incoming webhooks or API payloads.
- Creating API wrappers and SDK clients quickly in Ruby.
- Bootstrapping ActiveModel classes for form objects in a Ruby on Rails application.
- Defining lightweight Ruby Structs for parsed JSON configuration files.