What Python features does the output use?

It emits @dataclass classes with typing-module hints — Optional[T] for non-required fields with a None default, List[T] for arrays, and Literal[...] for string enums. The needed imports (dataclass plus the typing symbols used) are included at the top of the output.

How are required vs optional fields handled?

Fields in the schema's required array are mandatory. Others become Optional[T] with a default of None, and are ordered after required fields so the dataclass is valid.

Does it support nested objects?

Yes. Nested object schemas become separate dataclasses emitted in dependency order, so child classes are defined before the parent references them.

Is my schema uploaded?

No. Generation runs entirely in your browser. Nothing is sent to a server or stored.

JSON Schema → Python Dataclass

Generate Python dataclasses from JSON Schema

The JSON Schema → Python Dataclass converter turns a JSON Schema into clean @dataclass definitions with proper type hints. It is ideal for Python services that consume LLM structured output or function-calling arguments — the model’s schema becomes a typed class you can construct and validate against.

How it works

The generator walks the schema and maps JSON types to Python: string→str, integer→int, number→float, boolean→bool, array→List[T], and objects to nested dataclasses. String enums become Literal[...]. Fields not in required are wrapped in Optional[T] with a None default and ordered after required fields, because a dataclass cannot put a defaulted field before a non-defaulted one. Nested classes are emitted in dependency order so every reference resolves.

Tips and notes

The output includes the needed imports (dataclasses, typing). For LLM work, generate the dataclass for your tool’s parameters schema, then build instances from the JSON the model returns to get editor autocomplete and runtime checks. If you need stricter validation, the same shape ports cleanly to Pydantic models. Everything is computed locally — nothing you paste leaves the browser.