json2pytype 0.1.1

A tool to generate Python classes with type hints from JSON files

JSON to Python Class Generator

A tool that converts JSON files into Python classes with type hints, making it easier to work with structured JSON data in Python.

Features

• Converts JSON structures to Python classes with proper type annotations
• Handles nested objects and arrays
• Maintains proper naming conventions (camelCase to snake_case, etc.)
• Generates __init__ method for object initialization
• Includes __call__ method to convert back to dictionary

Installation

From Source

Clone the repository

git clone https://github.com/yourusername/json2pyclass.git
cd json2pyclass

Install with pip

pip install .

For development (includes testing dependencies)

pip install ".[dev]"

Usage

Command Line Interface

Basic usage

json2pyclass input.json -o output.py

If output path is not specified, it will use input filename with .py extension

json2pyclass data.json

As a Library

from json2pyclass import generate_type_declare_file

Generate Python classes from JSON file

generate_type_declare_file("input.json", "output.py")

Example

For a JSON file like this: { "userName": "john_doe", "age": 30, "isActive": true, "address": { "street": "123 Main St", "city": "Anytown" }, "hobbies": ["reading", "hiking"] } The tool will generate a Python file with classes: from typing import List, Dict, Any, Optional

class Address: street: str city: str

def __init__(self, data: dict):
    self.street = data.get('street')
    self.city = data.get('city')
    pass

def __call__(self) -> dict:
    result = {}
    result['street'] = self.street
    result['city'] = self.city
    return result

class User: user_name: str age: int is_active: bool address: Address hobbies: List[str]

def __init__(self, data: dict):
    self.user_name = data.get('userName')
    self.age = data.get('age')
    self.is_active = data.get('isActive')
    self.address = Address(data.get('address', {}))
    self.hobbies = data.get('hobbies', [])
    pass

def __call__(self) -> dict:
    result = {}
    result['userName'] = self.user_name
    result['age'] = self.age
    result['isActive'] = self.is_active
    result['address'] = self.address() if self.address else None
    result['hobbies'] = self.hobbies
    return result

Testing

Run the test suite with: pytest

License

This project is licensed under the MIT License - see the LICENSE file for details.