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Automatically generate Objective-C model classes from JSON data for iOS and macOS development.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This page reads a JSON example and generates Objective-C classes that reflect the objects and fields present in that sample. JSON is a text format for structured values: strings, numbers, booleans, null, objects, and arrays. A model class gives an app named properties for data it needs to work with. For a nested object, generated output can include a corresponding model type; arrays and scalar fields are inferred from the values supplied.
The result is a starting model for a response shape, not a schema extracted from an API contract. Apple’s Foundation documentation describes parsing JSON into Foundation objects such as dictionaries, arrays, strings, and numbers; the generated classes are a separate modeling step for application code.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use valid JSON with quoted keys and strings, balanced braces and brackets, and no trailing comma. The generator updates after the input changes. If parsing fails, correct the JSON before relying on the output.
The root type starts as Root; replace it with the model name used in your project. For Objective-C, the class prefix starts as QT and can be edited. Review the combined naming so generated type names match your project conventions.
Keep All for the full generated output, or select interface declarations only or implementation only when that is the piece you need. You can also turn explanatory comments on. These options change what appears in the result.
Inspect property names, nested classes, and types against the API contract, then copy or download the code. Add it to the right project files and compile and parse representative responses in your own project.
Use cases
See how the tool fits into real work and everyday tasks.
An iOS or macOS developer can paste a real response sample, generate a root model and nested types, and then compare the result with endpoint documentation for optional fields and alternate response states.
A team maintaining an Objective-C codebase can use a representative payload to draft repeated property and type declarations, then review names and parsing behavior as part of the code change.
When a JSON response has several levels of nesting, generated classes can make its shape easier to discuss. Treat the output as a view of that example, and check additional samples before treating a field as always present.
Q&A
Find concise answers to common questions and confusing cases.
This page’s Objective-C options generate model code in the selected scope: all output, interface only, or implementation only. Do not assume a particular parsing or serialization helper is included; inspect the generated result and add the project’s chosen parsing approach separately.
No. A sample shows only the values and shapes it contains. Compare success, error, and other relevant responses with the API contract to identify fields that may be missing or null.
Inference is based on the supplied example. Include representative elements where possible, then check the generated array element type and all variant fields against the contract. A sample cannot establish every shape the service may return.
Check that the input is syntactically valid JSON and that it is not empty. Correct quoted keys, commas, and matching braces or brackets, then wait for the result to refresh.
Notes
Review scope, result limitations, and important precautions before use.
A JSON example is evidence of one observed response, not proof that fields are required or stable. Missing keys, explicit null, values that vary between integers and decimals, and arrays with multiple object shapes can all affect the model you need. Check property naming, null handling, nested types, and any key-to-property mapping required by your application before adopting the code.
Changing the root name, Objective-C prefix, output scope, or comment option changes the generated text. Recheck the complete output after changing settings. The target project remains responsible for imports, parsing behavior, compiler settings, and tests against real responses.
Related
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