JSON to Python (dataclass)

You got a config file or an API payload as JSON and you would rather not sprinkle cfg.get('db').get('host') across the codebase. Typing the equivalent dataclass by hand is repetitive and it is easy to miss a nested field. Paste the JSON here, name the root class, and you get the code with @dataclass, the typing imports and the annotations ready to drop into your module.

Each nested object becomes its own class, named after the key in PascalCase, and it is written above the class that uses it. That ordering matters more than it looks: the file works read top to bottom, with no string annotations and no from __future__ import annotations. In lists only the first element is inspected, and the item class gets an Item suffix, so items becomes ItemsItem. A null value becomes Optional[Any].

The input has to be an object at the top level. An array or a bare value returns the message Esperado objeto, so wrap the list in a key first. Field names are copied verbatim, so keys like user-name or class produce invalid Python: rename them and map on read, or move to Pydantic with Field(alias=...). There is no copy button, select the box and hit Ctrl+C. It all runs in the browser.