JSON to Python Dataclass

Bootstrap Python models from JSON with dataclass or Pydantic output.

JSON input

Python style

Generated Python

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

@dataclass
class ItemsItem:
    sku: str
    qty: int

@dataclass
class Customer:
    name: str
    email: str

@dataclass
class Root:
    order_id: int
    customer: Customer
    items: list[ItemsItem]
    paid: bool

What is this tool?

This tool infers Python type hints from JSON and emits either stdlib dataclasses or Pydantic BaseModel classes. Nested objects become nested classes and arrays become list[...] annotations. Field names are normalized to snake_case; a name that collides with a Python keyword (e.g. "class") gets a trailing underscore (class_) so the generated code is valid — note that changes what key it maps to if you serialize the field back to JSON. A field that's null in some samples and a concrete type in others is emitted as Optional[...].

How to use it

Paste JSON representing your payload shape.
Choose @dataclass or Pydantic BaseModel.
Copy the generated Python module and adjust Optional/defaults for your use case.

What is this tool?

How to use it

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