# Alternatives, Inspiration and Comparisons

What inspired **FastAPI**, how it compares to alternatives and what it learned from them.

## Intro

**FastAPI** wouldn't exist if not for the previous work of others.

There have been many tools created before that have helped inspire its creation.

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Alternative API-Dokumentation

Gehen Sie nun auf <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

Dort sehen Sie die alternative, automatische Dokumentation (bereitgestellt durch <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

## Les avantages d'avoir une documentation basée sur une norme, et la documentation alternative.

Le schéma généré suivant la norme <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md" class="external-link" target="_blank">OpenAPI</a>,
il existe de nombreux outils compatibles.

Grâce à cela, **FastAPI** lui-même fournit une documentation alternative (utilisant ReDoc), qui peut être lue

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Alternative API docs

And now, go to <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

You will see the alternative automatic documentation (provided by <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

## Nützliche Standards. Alternative Dokumentation

Und weil das generierte Schema vom <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md" class="external-link" target="_blank">OpenAPI</a>-Standard kommt, gibt es viele kompatible Tools.

A common tool is <a href="https://openapi-generator.tech/" class="external-link" target="_blank">OpenAPI Generator</a>.

If you are building a **frontend**, a very interesting alternative is <a href="https://github.com/hey-api/openapi-ts" class="external-link" target="_blank">openapi-ts</a>.

## Client and SDK Generators - Sponsor

    "root_path": "/api/v1"
}
```

### Festlegen des `root_path` in der FastAPI-Anwendung

Falls Sie keine Möglichkeit haben, eine Kommandozeilenoption wie `--root-path` oder ähnlich zu übergeben, können Sie als Alternative beim Erstellen Ihrer FastAPI-Anwendung den Parameter `root_path` setzen:

```Python hl_lines="3"
{!../../../docs_src/behind_a_proxy/tutorial002.py!}
```

!!! warning
    This is a more advanced use case. Feel free to skip it.

By default, **FastAPI** will create a `server` in the OpenAPI schema with the URL for the `root_path`.

But you can also provide other alternative `servers`, for example if you want *the same* docs UI to interact with a staging and production environments.

    ```

=== "Python 3.8+"

    ```Python hl_lines="1  4"
    {!> ../../../docs_src/python_types/tutorial009.py!}
    ```

=== "Python 3.8+ alternative"

    ```Python hl_lines="1  4"
    {!> ../../../docs_src/python_types/tutorial009b.py!}
    ```

#### Using `Union` or `Optional`

### `ORJSONResponse`

Eine schnelle alternative JSON-Response mit <a href="https://github.com/ijl/orjson" class="external-link" target="_blank">`orjson`</a>, wie Sie oben gelesen haben.

### `UJSONResponse`

Eine alternative JSON-Response mit <a href="https://github.com/ultrajson/ultrajson" class="external-link" target="_blank">`ujson`</a>.