read_root - Code Search

.github/DISCUSSION_TEMPLATE/questions.yml

      placeholder: |
        from fastapi import FastAPI

        app = FastAPI()


        @app.get("/")
        def read_root():
            return {"Hello": "World"}
      render: python
    validations:
      required: true
  - type: textarea
    id: description
    attributes:
      label: Description
      description: |

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/ja/docs/index.md

## アプリケーション例 { #example }

### 作成 { #create-it }

`main.py` ファイルを作成し、以下のコードを入力します。

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/en/docs/index.md

## Example { #example }

### Create it { #create-it }

Create a file `main.py` with:

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/es/docs/index.md

## Ejemplo { #example }

### Créalo { #create-it }

Crea un archivo `main.py` con:

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/pt/docs/index.md

## Exemplo { #example }

### Crie { #create-it }

Crie um arquivo `main.py` com:

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/fr/docs/index.md

## Exemple { #example }

### Créer { #create-it }

Créez un fichier `main.py` avec :

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

README.md

## Example

### Create it

Create a file `main.py` with:

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/zh-hant/docs/index.md

## 範例 { #example }

### 建立 { #create-it }

建立檔案 `main.py`，內容如下：

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

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github.com/tiangolo/fastapi

tests/test_response_model_as_return_annotation.py

    assert response.json() == {"foo": "bar"}


def test_invalid_response_model_field():
    app = FastAPI()
    with pytest.raises(FastAPIError) as e:

        @app.get("/")
        def read_root() -> Response | None:
            return Response(content="Foo")  # pragma: no cover

    assert "valid Pydantic field type" in e.value.args[0]
    assert "parameter response_model=None" in e.value.args[0]

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github.com/tiangolo/fastapi

docs/en/docs/deployment/docker.md

* Create an `app` directory and enter it.
* Create an empty file `__init__.py`.
* Create a `main.py` file with:

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile { #dockerfile }

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