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Automatically convert JSON data into Ruby class definitions. Generate code with properties and initialize methods for seamless integration into your Ruby projects.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Paste valid JSON and the converter produces Ruby code based on the structure and values in that sample. You can set a root type name and adjust Ruby strictness or choose type-only output. Objects, nested values, arrays, and primitive values give the generator evidence for the shape of the code; it cannot infer fields or cases that do not appear in the input.
JSON is a text format with objects and arrays as structured values, plus strings, numbers, booleans, and null. That syntax describes data, while generated Ruby types are code intended to represent a useful model. Ruby’s JSON library separately parses a JSON object into a Hash by default; see the IETF JSON specification and Ruby JSON documentation.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use quoted string keys and values, matching braces and brackets, and JSON-compatible values. Comments and trailing commas are not part of standard JSON syntax.
Choose a name that fits your application. The output regenerates as you change the input or settings.
Choose the available strictness setting and whether to generate only type definitions. The defaults can be changed to suit how you plan to use the result.
Inspect names, nesting, array element shapes, and nullable values. Copy or download the generated output, then test it against the Ruby version and conventions used by your project.
Use cases
See how the tool fits into real work and everyday tasks.
A developer can turn one representative response into an initial model sketch, then compare it with responses that contain optional fields, alternate values, or different array contents.
A team can generate types from a test fixture or configuration sample and use the result as a starting point for a hand-reviewed data model.
A learner can inspect how nested objects and arrays affect generated types, then compare those declarations with Ruby’s runtime parsing behavior.
Q&A
Find concise answers to common questions and confusing cases.
The input must parse as valid JSON before generation. Check double quotes, commas, and matching braces and brackets; JSON does not allow comments.
No. Fields absent from the sample cannot be inferred. Include representative responses for optional fields, different variants, and arrays whose elements may vary.
No. Generating type code and parsing JSON are separate tasks. Ruby’s JSON module returns ordinary Ruby values by default; adapt parsing and object construction to your application.
It changes the generated code style to output type definitions only. Review the exact result and add parsing, validation, or initialization behavior required by your application.
Notes
Review scope, result limitations, and important precautions before use.
The output reflects the supplied example, not a complete API contract or proof that the code matches production data.
Confirm naming, null handling, optional fields, and values that vary across responses. A field shown once does not reveal whether it is always present or required. The generator does not establish business validation rules, security constraints, or compatibility with a particular application architecture. Run the code in your target Ruby environment and add project-specific parsing and tests before relying on it.
A sample can contain sensitive information. Replace secrets, access tokens, personal data, and private customer records with safe representative values before using any online code tool.
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