Por defecto, **FastAPI** convertiría automáticamente ese valor devuelto a JSON usando el `jsonable_encoder` explicado en [Codificador Compatible JSON](../tutorial/encoder.md){.internal-link target=_blank}.

Luego, tras bastidores, pondría esos datos compatibles con JSON (por ejemplo, un `dict`) dentro de una `JSONResponse` que se usaría para enviar la respuesta al cliente.

    Le bon endroit est :

    * Dans la clé `content`, qui a pour valeur un autre objet JSON (`dict`) qui contient :
        * Une clé avec le type de support, par ex. `application/json`, qui contient comme valeur un autre objet JSON, qui contient :
            * Une clé `schema`, qui a pour valeur le schéma JSON du modèle, voici le bon endroit.

Ils seront convertis vers leurs valeurs correspondantes (chaînes de caractères ici) avant d'être transmis au client :

```Python hl_lines="18  21  23"
{!../../../docs_src/path_params/tutorial005.py!}
```

Le client recevra une réponse JSON comme celle-ci :

```JSON
{
  "model_name": "alexnet",
  "message": "Deep Learning FTW!"

        headers={"content-type": "application/json"},
        content="{some broken json}",
    )
    assert response.status_code == 422, response.text
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "json_invalid",
                    "loc": ["body", 1],
                    "msg": "JSON decode error",
                    "input": {},

        headers={"content-type": "application/json"},
        content="{some broken json}",
    )
    assert response.status_code == 422, response.text
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "json_invalid",
                    "loc": ["body", 1],
                    "msg": "JSON decode error",
                    "input": {},

    assert response.json() == "foo bar"


def test_query_param_query_50():
    response = client.get("/query/param?query=50")
    assert response.status_code == 200
    assert response.json() == "foo bar 50"


def test_query_param_required():
    response = client.get("/query/param-required")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {

    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "X-Token header invalid"}


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {

    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "X-Token header invalid"}


@needs_py39
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},

    assert response.status_code == 404
    assert response.json() == {"detail": "Item not found"}


def test_create_item():
    response = client.post(
        "/items/",
        headers={"X-Token": "coneofsilence"},
        json={"id": "foobar", "title": "Foo Bar", "description": "The Foo Barters"},
    )
    assert response.status_code == 200
    assert response.json() == {
        "id": "foobar",
        "title": "Foo Bar",

    response = client.post("/token", data=data)
    content = response.json()
    access_token = content.get("access_token")
    return access_token


def test_login():
    response = client.post("/token", data={"username": "johndoe", "password": "secret"})
    assert response.status_code == 200, response.text
    content = response.json()
    assert "access_token" in content
    assert content["token_type"] == "bearer"