JSON to Ruby Hash/Class Converter

You’re building a Rails API client and the endpoint returns deeply nested JSON. You could parse it with JSON.parse and navigate hashes everywhere — data["user"]["profile"]["email"] — but one typo means a silent nil instead of a helpful error. A proper Ruby class with attr_accessor gives you method-style access, IDE autocomplete, and clearer code.

What This Tool Does

Paste any JSON and get Ruby code instantly — either plain hashes with symbol keys, or full class definitions with attr_accessor, initialize, and from_json class methods. Nested objects become nested classes. Arrays of objects are typed correctly.

Everything runs in your browser. Your data never leaves your device.

When to Use This

• API integration — paste a sample response to generate Ruby models for your HTTP client
• Configuration parsing — turn a JSON config file into a typed Ruby config class
• Data migration — convert JSON exports into Ruby objects for processing
• Rails development — quickly scaffold model-like classes from API responses

Ruby Hash vs Class Output

Hash output gives you a ready-to-use Ruby hash literal with symbol keys — useful for quick scripting or test fixtures.

Class output generates full Ruby classes with:

• attr_accessor for each field
• An initialize method with keyword arguments
• A from_json class method for parsing JSON strings
• Nested classes for nested objects

FAQ

Does this send my JSON to a server?

No. All processing happens entirely in your browser using JavaScript.

How are nested objects handled?

Each nested JSON object becomes its own Ruby class, named after the parent class and the property key in PascalCase.

What about null values?

JSON null maps to Ruby nil. Fields are initialized with nil as the default when the value is null.