JSON to Ruby Converter
Convert JSON to Ruby classes online. Generate Ruby classes with attr_accessor for Rails and Ruby projects. Free, runs in your browser.
JSON Input
Ruby Output
What Is JSON to Ruby?
Ruby uses classes and objects for structured data. When you consume JSON in Rails or Ruby apps, you need matching classes with the right attribute names. The JSON specification defines objects, arrays, strings, numbers, and booleans—but Ruby needs explicit class definitions.
This tool generates Ruby classes from your JSON. Enable attr_accessor for getter/setter methods. The output uses snake_case for attribute names, following Ruby conventions.
Conversion runs entirely in your browser. Your JSON is never sent to a server.
When JSON to Ruby Helps
When building Rails or Ruby apps that consume REST APIs, you need typed classes. Paste a sample response here to generate matching classes.
How to Use This Tool
Paste or Upload JSON
Copy your JSON and paste it into the left editor. You can also click Upload to load a file. Use the Sample button for example data. Set the class name and options in the config panel.
Review the Generated Classes
The right panel shows the generated Ruby classes. Nested objects become separate classes. If your JSON has invalid syntax, fix it first using the JSON Formatter or JSON Validator.
Copy or Download
Use Copy or Download to get the code. Paste into your Rails or Ruby project.
JSON to Ruby Examples
Here is an example of generating Ruby classes from a JSON object.
Example: Subscriber record
JSON input:
Generated Ruby output:
When JSON to Ruby Helps
Most developers need this when integrating with REST APIs. Pasting it here gives you Ruby classes you can use with JSON.parse.
If you need to merge two JSON files first, there's a separate JSON Merge tool for that.
API responses, config files, or data exports are often JSON. Running them through here helps you generate Ruby classes.
Frequently Asked Questions
attr_accessor vs attr_reader/attr_writer?
attr_accessor creates both getter and setter. Use attr_reader for read-only or attr_writer for write-only when needed.
What about JSON key naming?
The generator uses snake_case for Ruby attribute names. Use JSON.parse with symbol keys or configure your JSON library for key mapping.
Is my data sent anywhere?
No. Generation runs entirely in your browser. No data is sent to any server.
Can I use this with Rails?
Yes. The generated classes work with Rails APIs. You can add ActiveModel::Serializers::JSON or use with JSON.parse.
What about nested objects?
Nested JSON objects become separate Ruby classes. Arrays become arrays of those class instances.
Related Tools
For Ruby JSON, see JSON. For JSON, see the JSON specification. For Rails, see Rails.