TTULAKITO
Developer

JSON to Pydantic Model

Convert JSON into Python Pydantic v2 model classes.

All tools

JSON

Pydantic v2

from typing import Any, List, Optional
from pydantic import BaseModel


class Profile(BaseModel):
    email: str


class Root(BaseModel):
    id: int
    name: str
    active: bool
    tags: List[str]
    profile: Profile

Frequently asked questions

What changed between Pydantic v1 and v2 models?
v2 renamed methods (dict to model_dump, parse_obj to model_validate), moved config from a Config class to model_config, and replaced @validator with @field_validator. It is also much faster thanks to a Rust core.
How are optional JSON fields typed in a Pydantic model?
Use Optional[T] or T | None with a default of None to indicate the field may be missing or null. Without a default the field is still required even if its type is Optional.
Can Pydantic validate a JSON string directly?
Yes, call Model.model_validate_json(raw_str) to parse and validate in one step instead of json.loads followed by model_validate. It is faster and surfaces JSON errors with the same error model.