Are nested objects turned into separate dataclasses?

Yes, each nested object generates its own dataclass named after the field.

How are arrays typed?

Arrays become typing.List[...] annotations based on their first element's type.

What imports are included?

The output includes dataclasses.dataclass and typing.Any/List/Optional imports as needed.

JSON to Python Dataclass

Generate Python dataclasses from JSON data.

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JSON input

Root class name

Python dataclass

from dataclasses import dataclass
from typing import Any, List, Optional


@dataclass
class Root:
    id: int
    name: str
    active: bool

About the JSON to Python Dataclass

Paste a JSON object or array and generate matching Python @dataclass definitions with type hints, including nested dataclasses for embedded objects and typing imports.

Examples

Simple object

{ "id": 1, "name": "Ada" }

Output

@dataclass
class Root:
    id: int
    name: str

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-07 · Runs entirely in your browser