from typing import List

from fastapi import FastAPI
from fastapi._compat import PYDANTIC_V2
from fastapi.testclient import TestClient
from pydantic import BaseModel, ConfigDict, Field

app = FastAPI()


class Model(BaseModel):
    name: str = Field(alias="alias")


class ModelNoAlias(BaseModel):
    name: str

    if PYDANTIC_V2:
        model_config = ConfigDict(
            json_schema_extra={

* Validation de données.
* Annotations d'API et documentation automatique.

Et vous n'avez besoin de le déclarer qu'une fois.

## Client and SDK Generators - Sponsor

There are also some **company-backed** Client and SDK generators based on OpenAPI (FastAPI), in some cases they can offer you **additional features** on top of high-quality generated SDKs/clients.

from typing import Any, Callable, Dict, List, Optional, Sequence, Union

from fastapi.openapi.models import Example
from pydantic.fields import FieldInfo
from typing_extensions import Annotated, deprecated

from ._compat import PYDANTIC_V2, PYDANTIC_VERSION, Undefined

_Unset: Any = Undefined


class ParamTypes(Enum):
    query = "query"
    header = "header"
    path = "path"
    cookie = "cookie"

    Check more details in the [Deployment](deployment/index.md){.internal-link target=_blank} section.

## Benchmarks and speed

Nie wieder falsche Schlüsselnamen tippen, Hin und Herhüpfen zwischen der Dokumentation, Hoch- und Runterscrollen, um herauszufinden, ob es `username` oder `user_name` war.

### Kompakt

Es gibt für alles sensible **Defaultwerte**, mit optionaler Konfiguration überall. Alle Parameter können feinjustiert werden, damit sie tun, was Sie benötigen, und die API definieren, die Sie brauchen.

from typing import Union

import pytest
from dirty_equals import IsDict
from fastapi import Body, Cookie, FastAPI, Header, Path, Query
from fastapi._compat import PYDANTIC_V2
from fastapi.testclient import TestClient
from pydantic import BaseModel, ConfigDict


def create_app():
    app = FastAPI()

    class Item(BaseModel):
        data: str

        if PYDANTIC_V2:
            model_config = ConfigDict(

### Autres fonctions utilitaires

Toute autre fonction utilitaire que vous appelez directement peut être créée avec un classique `def` ou avec `async def` et **FastAPI** n'aura pas d'impact sur la façon dont vous l'appelez.

Contrairement aux fonctions que **FastAPI** appelle pour vous : les *fonctions de chemin* et dépendances.

            json_schema["title"] = (
                field.field_info.title or field.alias.title().replace("_", " ")
            )
        return json_schema

    def get_compat_model_name_map(fields: List[ModelField]) -> ModelNameMap:
        return {}

    def get_definitions(
        *,
        fields: List[ModelField],
        schema_generator: GenerateJsonSchema,

I love to hear about how **FastAPI** is being used, what you have liked in it, in which project/company are you using it, etc.

## Vote for FastAPI

* <a href="https://www.slant.co/options/34241/~fastapi-review" class="external-link" target="_blank">Vote for **FastAPI** in Slant</a>.