{"library":"pydantic","title":"Pydantic","description":"The most widely used Python data validation library. Powers OpenAI SDK, Anthropic SDK, LangChain, FastAPI, LlamaIndex, and hundreds of other libraries. V2 released June 2023 — a near-complete rewrite in Rust via pydantic-core, 4-50x faster than V1. Current version is 2.12.5 (Mar 2026). V1 security fixes ended June 2024. V3 planned roughly annually.","language":"python","status":"active","last_verified":"Tue May 19","install":{"commands":["pip install pydantic","pip install 'pydantic[email]'","pip install pydantic-settings"],"cli":null},"imports":["from pydantic import BaseModel, field_validator, model_validator\n\nclass User(BaseModel):\n    name: str\n    age: int\n\n    @field_validator('age')\n    @classmethod\n    def age_must_be_positive(cls, v):\n        if v <= 0:\n            raise ValueError('age must be positive')\n        return v","from pydantic import BaseModel, model_validator\n\nclass User(BaseModel):\n    name: str\n    age: int\n\n    @model_validator(mode='before')\n    @classmethod\n    def check_root(cls, values):\n        return values","from pydantic import BaseModel, ConfigDict\n\nclass User(BaseModel):\n    model_config = ConfigDict(from_attributes=True)\n    name: str","from pydantic_settings import BaseSettings\n\nclass Settings(BaseSettings):\n    api_key: str\n    model_config = ConfigDict(env_file='.env')"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"from pydantic import BaseModel, field_validator, ConfigDict\n\nclass User(BaseModel):\n    model_config = ConfigDict(from_attributes=True)\n\n    name: str\n    age: int\n\n    @field_validator('age')\n    @classmethod\n    def age_positive(cls, v):\n        assert v > 0, 'age must be positive'\n        return v\n\nuser = User(name='Alice', age=30)\nprint(user.model_dump())  # not .dict()\nprint(user.model_dump_json())  # not .json()","lang":"python","description":"Pydantic V2 style model with field validator and config.","tag":"verified","tag_description":"quickstart runs on critical runtimes, recently 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