JSON to Python Converter

Writing dataclass definitions by hand to match an API response or config file is tedious and easy to get subtly wrong — especially remembering that Python requires every required field to come before any field with a default value. This tool reads a JSON sample and generates matching Python @dataclass definitions automatically — inferring str, int, float, bool, List, and Optional types, and splitting nested objects into their own named classes rather than one giant nested structure.

For example, {"name": "Alice", "address": {"city": "NYC"}} generates:

from dataclasses import dataclass


@dataclass
class Address:
    city: str


@dataclass
class Root:
    name: str
    address: Address

Paste your JSON into the input box on the left, set the Class name you want for the top-level type, and click Convert. The generated Python appears in the output box on the right, with any parse errors shown below.