JSON to Python

Convert JSON data to Python type definitions using quicktype engine. Supports type inference and nested type generation.

Root Type Name

Python Version

Just Types (class definitions only)

Pydantic BaseModel base class

Pythonic property names

JSON Input

Python Output

Usage

Features

Based on quicktype engine, this tool automatically converts JSON data to Python type definitions with type inference and nested type generation.

Steps

Enter or paste JSON data in the left text box, set the root type name and Python version, check rendering options as needed. Python code will be generated in real time.

Options

Python version: 3.5 no type annotations, no dataclasses; 3.6 uses typing annotations; 3.7 uses annotations + dataclasses.
Just Types: only generates class definitions, no from_json/to_json serialization methods.
Pydantic BaseModel: classes inherit from pydantic.BaseModel with runtime validation.
Property names: converts JSON field names to snake_case. Enabled by default.

Notes

Number types are automatically inferred as int or float. null values become None. Arrays become List.