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?
If you're building a Rails API client or a Ruby script that calls a third-party service, you're going to get JSON back. And unless you want to navigate raw hashes everywhere, you need Ruby classes with proper attribute accessors. The JSON specification is clean and simple, but Ruby needs explicit class definitions to work with typed data — this tool generates them for you automatically.
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
How do I parse JSON into a Ruby class?
Call JSON.parse(json_string) to get a Hash, then map the keys to your class attributes in the initializer. A quicker approach is to generate the Ruby class here — paste your JSON, copy the output, and add an initializer that maps hash keys to attr_accessor fields.
What is attr_accessor in Ruby?
attr_accessor creates both a getter and setter method for an instance variable. It's the Ruby equivalent of a public property. Use attr_reader for read-only or attr_writer for write-only attributes when you want to restrict access.
How do I handle JSON key naming in Ruby?
Ruby convention is snake_case, but JSON often uses camelCase. The generator converts to snake_case for you. At runtime, use JSON.parse(json_string, symbolize_names: true) or a library like HashWithIndifferentAccess in Rails to access keys flexibly.
Is my JSON sent to a server?
No. The class generation runs entirely in your browser. Your JSON never leaves your machine.
What about nested JSON objects?
Nested JSON objects become separate Ruby classes. Arrays become arrays of those class instances. You can instantiate nested classes in the parent class initializer to fully model the JSON structure.
Related Tools
For Ruby JSON, see JSON. For JSON, see the JSON specification. For Rails, see Rails.