JSON to Pydantic Converter
Convert JSON objects to Python Pydantic models or Dataclasses.
About the JSON to Pydantic Converter
Our JSON to Pydantic Converter is a developer-focused tool that automates the process of creating Python data models. Instead of manually writing classes for large JSON API responses, you can simply paste the JSON, and our tool will generate the correct Pydantic models or Dataclasses for you.
The tool is smart enough to detect data types (like strings, integers, and booleans) and handle nested objects by creating separate classes for them. It also automatically adds Type Hints (like List and Optional), ensuring your code is ready for modern Python development and static type checking.
How to Use the Tool
- Paste your raw JSON data into the "Input JSON" editor.
- The tool will instantly generate the corresponding Python code in the right panel.
- Use the "Class Type" option to switch between Pydantic models (ideal for API validation) and standard Python Dataclasses.
- Click "Copy" to grab the code or "Download" to save it as a `.py` file.
Frequently Asked Questions
What is Pydantic?
Pydantic is a data validation library for Python. It uses Python type hints to validate input data. If the data matches the model you define, it works; if not, it raises an error. It is widely used in modern frameworks like FastAPI.
What is the difference between Pydantic and Dataclasses?
Standard Python Dataclasses (`@dataclass`) are great for storing data with simple type hints, while Pydantic models actively validate and parse data, making them safer for API inputs.
Does this tool handle nested JSON?
Yes, absolutely. If your JSON contains objects inside objects, this tool recursively parses them and generates a separate class for every nested object, linking them together with type hints.
Why are some fields marked as "Optional"?
If the tool detects a `null` value in your JSON, it automatically types that field as `Optional[Any]`. This prevents your code from crashing if the API returns null for that field in the future.
Is my JSON data private?
Yes. This converter runs entirely in your web browser using JavaScript. We never see, store, or transmit your JSON data to any server.