![Swagger UI](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Haz click en el botón de "Try it out" que te permite llenar los parámetros e interactuar directamente con la API:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

If you want to play with JWT tokens and see how they work, check <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a>.

## Install `python-jose`

We need to install `python-jose` to generate and verify the JWT tokens in Python:

<div class="termy">

!!! tip
    In this example, the variable is called `router`, but you can name it however you want.

We are going to include this `APIRouter` in the main `FastAPI` app, but first, let's check the dependencies and another `APIRouter`.

## Dependencies

We see that we are going to need some dependencies used in several places of the application.

In this case, it will be mounted at the path `/subapi`:

```Python hl_lines="11  19"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### Check the automatic API docs

Now, run `uvicorn` with the main app, if your file is `main.py`, it would be:

<div class="termy">

```console
$ uvicorn main:app --reload

{**note.dict(), "id": last_record_id}
```

So, the final result returned would be something like:

```Python
{
    "id": 1,
    "text": "Some note",
    "completed": False,
}
```

## Check it

You can copy this code as is, and see the docs at <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

There you can see all your API documented and interact with it:

Pydantic 모델인 `User`로 `current_user`의 타입을 선언하는 것을 알아야 합니다.

이것은 모든 완료 및 타입 검사를 통해 함수 내부에서 우리를 도울 것입니다.

!!! tip "팁"
    요청 본문도 Pydantic 모델로 선언된다는 것을 기억할 것입니다.

    여기서 **FastAPI**는 `Depends`를 사용하고 있기 때문에 혼동되지 않습니다.

!!! check "확인"
    이 의존성 시스템이 설계된 방식은 모두 `User` 모델을 반환하는 다양한 의존성(다른 "의존적인")을 가질 수 있도록 합니다.

    해당 타입의 데이터를 반환할 수 있는 의존성이 하나만 있는 것으로 제한되지 않습니다.

## 다른 모델

By considering these concepts, you will be able to **evaluate and design** the best way to deploy **your own APIs**.

In the next chapters, I'll give you more **concrete recipes** to deploy FastAPI applications.

But for now, let's check these important **conceptual ideas**. These concepts also apply to any other type of web API. 💡

## Security - HTTPS

## オプショナルなパラメータ

同様に、デフォルト値を `None` とすることで、オプショナルなクエリパラメータを宣言できます:

```Python hl_lines="9"
{!../../../docs_src/query_params/tutorial002.py!}
```

この場合、関数パラメータ `q` はオプショナルとなり、デフォルトでは `None` になります。

!!! check "確認"
    パスパラメータ `item_id` はパスパラメータであり、`q` はそれとは違ってクエリパラメータであると判別できるほど**FastAPI** が賢いということにも注意してください。

## クエリパラメータの型変換

`bool` 型も宣言できます。これは以下の様に変換されます:

```Python hl_lines="9"

<img src="/img/python-types/image02.png">

With that, you can scroll, seeing the options, until you find the one that "rings a bell":

<img src="/img/python-types/image03.png">

## More motivation

Check this function, it already has type hints:

```Python hl_lines="1"
{!../../../docs_src/python_types/tutorial003.py!}
```

    * 你还可以添加[具有 `scopes` 的 `Security` 依赖项](../advanced/security/oauth2-scopes.md){.internal-link target=_blank}。

!!! tip
    在 `APIRouter`中具有 `dependencies` 可以用来，例如，对一整组的*路径操作*要求身份认证。即使这些依赖项并没有分别添加到每个路径操作中。

!!! check
    `prefix`、`tags`、`responses` 以及 `dependencies` 参数只是（和其他很多情况一样）**FastAPI** 的一个用于帮助你避免代码重复的功能。

### 导入依赖项

这些代码位于 `app.routers.items` 模块，`app/routers/items.py` 文件中。