| Name | fastapi JSON |
| Version |
0.115.6
JSON |
| download |
| home_page | None |
| Summary | FastAPI framework, high performance, easy to learn, fast to code, ready for production |
| upload_time | 2024-12-03 22:46:01 |
| maintainer | None |
| docs_url | None |
| author | None |
| requires_python | >=3.8 |
| license | None |
| keywords |
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| VCS |
 |
| bugtrack_url |
|
| requirements |
No requirements were recorded.
|
| Travis-CI |
No Travis.
|
| coveralls test coverage |
No coveralls.
|
<p align="center">
<a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
<em>FastAPI framework, high performance, easy to learn, fast to code, ready for production</em>
</p>
<p align="center">
<a href="https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster" target="_blank">
<img src="https://github.com/fastapi/fastapi/workflows/Test/badge.svg?event=push&branch=master" alt="Test">
</a>
<a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/fastapi" target="_blank">
<img src="https://coverage-badge.samuelcolvin.workers.dev/fastapi/fastapi.svg" alt="Coverage">
</a>
<a href="https://pypi.org/project/fastapi" target="_blank">
<img src="https://img.shields.io/pypi/v/fastapi?color=%2334D058&label=pypi%20package" alt="Package version">
</a>
<a href="https://pypi.org/project/fastapi" target="_blank">
<img src="https://img.shields.io/pypi/pyversions/fastapi.svg?color=%2334D058" alt="Supported Python versions">
</a>
</p>
---
**Documentation**: <a href="https://fastapi.tiangolo.com" target="_blank">https://fastapi.tiangolo.com</a>
**Source Code**: <a href="https://github.com/fastapi/fastapi" target="_blank">https://github.com/fastapi/fastapi</a>
---
FastAPI is a modern, fast (high-performance), web framework for building APIs with Python based on standard Python type hints.
The key features are:
* **Fast**: Very high performance, on par with **NodeJS** and **Go** (thanks to Starlette and Pydantic). [One of the fastest Python frameworks available](#performance).
* **Fast to code**: Increase the speed to develop features by about 200% to 300%. *
* **Fewer bugs**: Reduce about 40% of human (developer) induced errors. *
* **Intuitive**: Great editor support. <abbr title="also known as auto-complete, autocompletion, IntelliSense">Completion</abbr> everywhere. Less time debugging.
* **Easy**: Designed to be easy to use and learn. Less time reading docs.
* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.
* **Robust**: Get production-ready code. With automatic interactive documentation.
* **Standards-based**: Based on (and fully compatible with) the open standards for APIs: <a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank">OpenAPI</a> (previously known as Swagger) and <a href="https://json-schema.org/" class="external-link" target="_blank">JSON Schema</a>.
<small>* estimation based on tests on an internal development team, building production applications.</small>
## Sponsors
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<a href="https://cryptapi.io/" target="_blank" title="CryptAPI: Your easy to use, secure and privacy oriented payment gateway."><img src="https://fastapi.tiangolo.com/img/sponsors/cryptapi.svg"></a>
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<a href="https://www.porter.run" target="_blank" title="Deploy FastAPI on AWS with a few clicks"><img src="https://fastapi.tiangolo.com/img/sponsors/porter.png"></a>
<a href="https://bump.sh/fastapi?utm_source=fastapi&utm_medium=referral&utm_campaign=sponsor" target="_blank" title="Automate FastAPI documentation generation with Bump.sh"><img src="https://fastapi.tiangolo.com/img/sponsors/bump-sh.svg"></a>
<a href="https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge" target="_blank" title="Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files"><img src="https://fastapi.tiangolo.com/img/sponsors/scalar.svg"></a>
<a href="https://www.propelauth.com/?utm_source=fastapi&utm_campaign=1223&utm_medium=mainbadge" target="_blank" title="Auth, user management and more for your B2B product"><img src="https://fastapi.tiangolo.com/img/sponsors/propelauth.png"></a>
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<a href="https://liblab.com?utm_source=fastapi" target="_blank" title="liblab - Generate SDKs from FastAPI"><img src="https://fastapi.tiangolo.com/img/sponsors/liblab.png"></a>
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<a href="https://github.com/deepset-ai/haystack/" target="_blank" title="Build powerful search from composable, open source building blocks"><img src="https://fastapi.tiangolo.com/img/sponsors/haystack-fastapi.svg"></a>
<a href="https://databento.com/" target="_blank" title="Pay as you go for market data"><img src="https://fastapi.tiangolo.com/img/sponsors/databento.svg"></a>
<a href="https://speakeasy.com?utm_source=fastapi+repo&utm_medium=github+sponsorship" target="_blank" title="SDKs for your API | Speakeasy"><img src="https://fastapi.tiangolo.com/img/sponsors/speakeasy.png"></a>
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<!-- /sponsors -->
<a href="https://fastapi.tiangolo.com/fastapi-people/#sponsors" class="external-link" target="_blank">Other sponsors</a>
## Opinions
"_[...] I'm using **FastAPI** a ton these days. [...] I'm actually planning to use it for all of my team's **ML services at Microsoft**. Some of them are getting integrated into the core **Windows** product and some **Office** products._"
<div style="text-align: right; margin-right: 10%;">Kabir Khan - <strong>Microsoft</strong> <a href="https://github.com/fastapi/fastapi/pull/26" target="_blank"><small>(ref)</small></a></div>
---
"_We adopted the **FastAPI** library to spawn a **REST** server that can be queried to obtain **predictions**. [for Ludwig]_"
<div style="text-align: right; margin-right: 10%;">Piero Molino, Yaroslav Dudin, and Sai Sumanth Miryala - <strong>Uber</strong> <a href="https://eng.uber.com/ludwig-v0-2/" target="_blank"><small>(ref)</small></a></div>
---
"_**Netflix** is pleased to announce the open-source release of our **crisis management** orchestration framework: **Dispatch**! [built with **FastAPI**]_"
<div style="text-align: right; margin-right: 10%;">Kevin Glisson, Marc Vilanova, Forest Monsen - <strong>Netflix</strong> <a href="https://netflixtechblog.com/introducing-dispatch-da4b8a2a8072" target="_blank"><small>(ref)</small></a></div>
---
"_I’m over the moon excited about **FastAPI**. It’s so fun!_"
<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>
---
"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"
<div style="text-align: right; margin-right: 10%;">Timothy Crosley - <strong><a href="https://github.com/hugapi/hug" target="_blank">Hug</a> creator</strong> <a href="https://news.ycombinator.com/item?id=19455465" target="_blank"><small>(ref)</small></a></div>
---
"_If you're looking to learn one **modern framework** for building REST APIs, check out **FastAPI** [...] It's fast, easy to use and easy to learn [...]_"
"_We've switched over to **FastAPI** for our **APIs** [...] I think you'll like it [...]_"
<div style="text-align: right; margin-right: 10%;">Ines Montani - Matthew Honnibal - <strong><a href="https://explosion.ai" target="_blank">Explosion AI</a> founders - <a href="https://spacy.io" target="_blank">spaCy</a> creators</strong> <a href="https://twitter.com/_inesmontani/status/1144173225322143744" target="_blank"><small>(ref)</small></a> - <a href="https://twitter.com/honnibal/status/1144031421859655680" target="_blank"><small>(ref)</small></a></div>
---
"_If anyone is looking to build a production Python API, I would highly recommend **FastAPI**. It is **beautifully designed**, **simple to use** and **highly scalable**, it has become a **key component** in our API first development strategy and is driving many automations and services such as our Virtual TAC Engineer._"
<div style="text-align: right; margin-right: 10%;">Deon Pillsbury - <strong>Cisco</strong> <a href="https://www.linkedin.com/posts/deonpillsbury_cisco-cx-python-activity-6963242628536487936-trAp/" target="_blank"><small>(ref)</small></a></div>
---
## **Typer**, the FastAPI of CLIs
<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>
If you are building a <abbr title="Command Line Interface">CLI</abbr> app to be used in the terminal instead of a web API, check out <a href="https://typer.tiangolo.com/" class="external-link" target="_blank">**Typer**</a>.
**Typer** is FastAPI's little sibling. And it's intended to be the **FastAPI of CLIs**. ⌨️ 🚀
## Requirements
FastAPI stands on the shoulders of giants:
* <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> for the web parts.
* <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> for the data parts.
## Installation
Create and activate a <a href="https://fastapi.tiangolo.com/virtual-environments/" class="external-link" target="_blank">virtual environment</a> and then install FastAPI:
<div class="termy">
```console
$ pip install "fastapi[standard]"
---> 100%
```
</div>
**Note**: Make sure you put `"fastapi[standard]"` in quotes to ensure it works in all terminals.
## Example
### Create it
* Create a file `main.py` with:
```Python
from typing import Union
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: Union[str, None] = None):
return {"item_id": item_id, "q": q}
```
<details markdown="1">
<summary>Or use <code>async def</code>...</summary>
If your code uses `async` / `await`, use `async def`:
```Python hl_lines="9 14"
from typing import Union
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
async def read_root():
return {"Hello": "World"}
@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
return {"item_id": item_id, "q": q}
```
**Note**:
If you don't know, check the _"In a hurry?"_ section about <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` and `await` in the docs</a>.
</details>
### Run it
Run the server with:
<div class="termy">
```console
$ fastapi dev main.py
╭────────── FastAPI CLI - Development mode ───────────╮
│ │
│ Serving at: http://127.0.0.1:8000 │
│ │
│ API docs: http://127.0.0.1:8000/docs │
│ │
│ Running in development mode, for production use: │
│ │
│ fastapi run │
│ │
╰─────────────────────────────────────────────────────╯
INFO: Will watch for changes in these directories: ['/home/user/code/awesomeapp']
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [2248755] using WatchFiles
INFO: Started server process [2248757]
INFO: Waiting for application startup.
INFO: Application startup complete.
```
</div>
<details markdown="1">
<summary>About the command <code>fastapi dev main.py</code>...</summary>
The command `fastapi dev` reads your `main.py` file, detects the **FastAPI** app in it, and starts a server using <a href="https://www.uvicorn.org" class="external-link" target="_blank">Uvicorn</a>.
By default, `fastapi dev` will start with auto-reload enabled for local development.
You can read more about it in the <a href="https://fastapi.tiangolo.com/fastapi-cli/" target="_blank">FastAPI CLI docs</a>.
</details>
### Check it
Open your browser at <a href="http://127.0.0.1:8000/items/5?q=somequery" class="external-link" target="_blank">http://127.0.0.1:8000/items/5?q=somequery</a>.
You will see the JSON response as:
```JSON
{"item_id": 5, "q": "somequery"}
```
You already created an API that:
* Receives HTTP requests in the _paths_ `/` and `/items/{item_id}`.
* Both _paths_ take `GET` <em>operations</em> (also known as HTTP _methods_).
* The _path_ `/items/{item_id}` has a _path parameter_ `item_id` that should be an `int`.
* The _path_ `/items/{item_id}` has an optional `str` _query parameter_ `q`.
### Interactive API docs
Now go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.
You will see the automatic interactive API documentation (provided by <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank">Swagger UI</a>):
### 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>):
## Example upgrade
Now modify the file `main.py` to receive a body from a `PUT` request.
Declare the body using standard Python types, thanks to Pydantic.
```Python hl_lines="4 9-12 25-27"
from typing import Union
from fastapi import FastAPI
from pydantic import BaseModel
app = FastAPI()
class Item(BaseModel):
name: str
price: float
is_offer: Union[bool, None] = None
@app.get("/")
def read_root():
return {"Hello": "World"}
@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
return {"item_id": item_id, "q": q}
@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):
return {"item_name": item.name, "item_id": item_id}
```
The `fastapi dev` server should reload automatically.
### Interactive API docs upgrade
Now go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.
* The interactive API documentation will be automatically updated, including the new body:
* Click on the button "Try it out", it allows you to fill the parameters and directly interact with the API:
* Then click on the "Execute" button, the user interface will communicate with your API, send the parameters, get the results and show them on the screen:
### Alternative API docs upgrade
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>.
* The alternative documentation will also reflect the new query parameter and body:
### Recap
In summary, you declare **once** the types of parameters, body, etc. as function parameters.
You do that with standard modern Python types.
You don't have to learn a new syntax, the methods or classes of a specific library, etc.
Just standard **Python**.
For example, for an `int`:
```Python
item_id: int
```
or for a more complex `Item` model:
```Python
item: Item
```
...and with that single declaration you get:
* Editor support, including:
* Completion.
* Type checks.
* Validation of data:
* Automatic and clear errors when the data is invalid.
* Validation even for deeply nested JSON objects.
* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of input data: coming from the network to Python data and types. Reading from:
* JSON.
* Path parameters.
* Query parameters.
* Cookies.
* Headers.
* Forms.
* Files.
* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of output data: converting from Python data and types to network data (as JSON):
* Convert Python types (`str`, `int`, `float`, `bool`, `list`, etc).
* `datetime` objects.
* `UUID` objects.
* Database models.
* ...and many more.
* Automatic interactive API documentation, including 2 alternative user interfaces:
* Swagger UI.
* ReDoc.
---
Coming back to the previous code example, **FastAPI** will:
* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
* If it is not, the client will see a useful, clear error.
* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.
* As the `q` parameter is declared with `= None`, it is optional.
* Without the `None` it would be required (as is the body in the case with `PUT`).
* For `PUT` requests to `/items/{item_id}`, read the body as JSON:
* Check that it has a required attribute `name` that should be a `str`.
* Check that it has a required attribute `price` that has to be a `float`.
* Check that it has an optional attribute `is_offer`, that should be a `bool`, if present.
* All this would also work for deeply nested JSON objects.
* Convert from and to JSON automatically.
* Document everything with OpenAPI, that can be used by:
* Interactive documentation systems.
* Automatic client code generation systems, for many languages.
* Provide 2 interactive documentation web interfaces directly.
---
We just scratched the surface, but you already get the idea of how it all works.
Try changing the line with:
```Python
return {"item_name": item.name, "item_id": item_id}
```
...from:
```Python
... "item_name": item.name ...
```
...to:
```Python
... "item_price": item.price ...
```
...and see how your editor will auto-complete the attributes and know their types:
For a more complete example including more features, see the <a href="https://fastapi.tiangolo.com/tutorial/">Tutorial - User Guide</a>.
**Spoiler alert**: the tutorial - user guide includes:
* Declaration of **parameters** from other different places as: **headers**, **cookies**, **form fields** and **files**.
* How to set **validation constraints** as `maximum_length` or `regex`.
* A very powerful and easy to use **<abbr title="also known as components, resources, providers, services, injectables">Dependency Injection</abbr>** system.
* Security and authentication, including support for **OAuth2** with **JWT tokens** and **HTTP Basic** auth.
* More advanced (but equally easy) techniques for declaring **deeply nested JSON models** (thanks to Pydantic).
* **GraphQL** integration with <a href="https://strawberry.rocks" class="external-link" target="_blank">Strawberry</a> and other libraries.
* Many extra features (thanks to Starlette) as:
* **WebSockets**
* extremely easy tests based on HTTPX and `pytest`
* **CORS**
* **Cookie Sessions**
* ...and more.
## Performance
Independent TechEmpower benchmarks show **FastAPI** applications running under Uvicorn as <a href="https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l=zijzen-7" class="external-link" target="_blank">one of the fastest Python frameworks available</a>, only below Starlette and Uvicorn themselves (used internally by FastAPI). (*)
To understand more about it, see the section <a href="https://fastapi.tiangolo.com/benchmarks/" class="internal-link" target="_blank">Benchmarks</a>.
## Dependencies
FastAPI depends on Pydantic and Starlette.
### `standard` Dependencies
When you install FastAPI with `pip install "fastapi[standard]"` it comes the `standard` group of optional dependencies:
Used by Pydantic:
* <a href="https://github.com/JoshData/python-email-validator" target="_blank"><code>email-validator</code></a> - for email validation.
Used by Starlette:
* <a href="https://www.python-httpx.org" target="_blank"><code>httpx</code></a> - Required if you want to use the `TestClient`.
* <a href="https://jinja.palletsprojects.com" target="_blank"><code>jinja2</code></a> - Required if you want to use the default template configuration.
* <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - Required if you want to support form <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>, with `request.form()`.
Used by FastAPI / Starlette:
* <a href="https://www.uvicorn.org" target="_blank"><code>uvicorn</code></a> - for the server that loads and serves your application. This includes `uvicorn[standard]`, which includes some dependencies (e.g. `uvloop`) needed for high performance serving.
* `fastapi-cli` - to provide the `fastapi` command.
### Without `standard` Dependencies
If you don't want to include the `standard` optional dependencies, you can install with `pip install fastapi` instead of `pip install "fastapi[standard]"`.
### Additional Optional Dependencies
There are some additional dependencies you might want to install.
Additional optional Pydantic dependencies:
* <a href="https://docs.pydantic.dev/latest/usage/pydantic_settings/" target="_blank"><code>pydantic-settings</code></a> - for settings management.
* <a href="https://docs.pydantic.dev/latest/usage/types/extra_types/extra_types/" target="_blank"><code>pydantic-extra-types</code></a> - for extra types to be used with Pydantic.
Additional optional FastAPI dependencies:
* <a href="https://github.com/ijl/orjson" target="_blank"><code>orjson</code></a> - Required if you want to use `ORJSONResponse`.
* <a href="https://github.com/esnme/ultrajson" target="_blank"><code>ujson</code></a> - Required if you want to use `UJSONResponse`.
## License
This project is licensed under the terms of the MIT license.
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"description": "<p align=\"center\">\n <a href=\"https://fastapi.tiangolo.com\"><img src=\"https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png\" alt=\"FastAPI\"></a>\n</p>\n<p align=\"center\">\n <em>FastAPI framework, high performance, easy to learn, fast to code, ready for production</em>\n</p>\n<p align=\"center\">\n<a href=\"https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster\" target=\"_blank\">\n <img src=\"https://github.com/fastapi/fastapi/workflows/Test/badge.svg?event=push&branch=master\" alt=\"Test\">\n</a>\n<a href=\"https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/fastapi\" target=\"_blank\">\n <img src=\"https://coverage-badge.samuelcolvin.workers.dev/fastapi/fastapi.svg\" alt=\"Coverage\">\n</a>\n<a href=\"https://pypi.org/project/fastapi\" target=\"_blank\">\n <img src=\"https://img.shields.io/pypi/v/fastapi?color=%2334D058&label=pypi%20package\" alt=\"Package version\">\n</a>\n<a href=\"https://pypi.org/project/fastapi\" target=\"_blank\">\n <img src=\"https://img.shields.io/pypi/pyversions/fastapi.svg?color=%2334D058\" alt=\"Supported Python versions\">\n</a>\n</p>\n\n---\n\n**Documentation**: <a href=\"https://fastapi.tiangolo.com\" target=\"_blank\">https://fastapi.tiangolo.com</a>\n\n**Source Code**: <a href=\"https://github.com/fastapi/fastapi\" target=\"_blank\">https://github.com/fastapi/fastapi</a>\n\n---\n\nFastAPI is a modern, fast (high-performance), web framework for building APIs with Python based on standard Python type hints.\n\nThe key features are:\n\n* **Fast**: Very high performance, on par with **NodeJS** and **Go** (thanks to Starlette and Pydantic). [One of the fastest Python frameworks available](#performance).\n* **Fast to code**: Increase the speed to develop features by about 200% to 300%. *\n* **Fewer bugs**: Reduce about 40% of human (developer) induced errors. *\n* **Intuitive**: Great editor support. <abbr title=\"also known as auto-complete, autocompletion, IntelliSense\">Completion</abbr> everywhere. Less time debugging.\n* **Easy**: Designed to be easy to use and learn. Less time reading docs.\n* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.\n* **Robust**: Get production-ready code. With automatic interactive documentation.\n* **Standards-based**: Based on (and fully compatible with) the open standards for APIs: <a href=\"https://github.com/OAI/OpenAPI-Specification\" class=\"external-link\" target=\"_blank\">OpenAPI</a> (previously known as Swagger) and <a href=\"https://json-schema.org/\" class=\"external-link\" target=\"_blank\">JSON Schema</a>.\n\n<small>* estimation based on tests on an internal development team, building production applications.</small>\n\n## Sponsors\n\n<!-- sponsors -->\n\n<a href=\"https://cryptapi.io/\" target=\"_blank\" title=\"CryptAPI: Your easy to use, secure and privacy oriented payment gateway.\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/cryptapi.svg\"></a>\n<a href=\"https://platform.sh/try-it-now/?utm_source=fastapi-signup&utm_medium=banner&utm_campaign=FastAPI-signup-June-2023\" target=\"_blank\" title=\"Build, run and scale your apps on a modern, reliable, and secure PaaS.\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/platform-sh.png\"></a>\n<a href=\"https://www.porter.run\" target=\"_blank\" title=\"Deploy FastAPI on AWS with a few clicks\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/porter.png\"></a>\n<a href=\"https://bump.sh/fastapi?utm_source=fastapi&utm_medium=referral&utm_campaign=sponsor\" target=\"_blank\" title=\"Automate FastAPI documentation generation with Bump.sh\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/bump-sh.svg\"></a>\n<a href=\"https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge\" target=\"_blank\" title=\"Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/scalar.svg\"></a>\n<a href=\"https://www.propelauth.com/?utm_source=fastapi&utm_campaign=1223&utm_medium=mainbadge\" target=\"_blank\" title=\"Auth, user management and more for your B2B product\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/propelauth.png\"></a>\n<a href=\"https://www.withcoherence.com/?utm_medium=advertising&utm_source=fastapi&utm_campaign=website\" target=\"_blank\" title=\"Coherence\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/coherence.png\"></a>\n<a href=\"https://www.mongodb.com/developer/languages/python/python-quickstart-fastapi/?utm_campaign=fastapi_framework&utm_source=fastapi_sponsorship&utm_medium=web_referral\" target=\"_blank\" title=\"Simplify Full Stack Development with FastAPI & MongoDB\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/mongodb.png\"></a>\n<a href=\"https://zuplo.link/fastapi-gh\" target=\"_blank\" title=\"Zuplo: Scale, Protect, Document, and Monetize your FastAPI\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/zuplo.png\"></a>\n<a href=\"https://liblab.com?utm_source=fastapi\" target=\"_blank\" title=\"liblab - Generate SDKs from FastAPI\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/liblab.png\"></a>\n<a href=\"https://docs.render.com/deploy-fastapi?utm_source=deploydoc&utm_medium=referral&utm_campaign=fastapi\" target=\"_blank\" title=\"Deploy & scale any full-stack web app on Render. Focus on building apps, not infra.\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/render.svg\"></a>\n<a href=\"https://github.com/deepset-ai/haystack/\" target=\"_blank\" title=\"Build powerful search from composable, open source building blocks\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/haystack-fastapi.svg\"></a>\n<a href=\"https://databento.com/\" target=\"_blank\" title=\"Pay as you go for market data\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/databento.svg\"></a>\n<a href=\"https://speakeasy.com?utm_source=fastapi+repo&utm_medium=github+sponsorship\" target=\"_blank\" title=\"SDKs for your API | Speakeasy\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/speakeasy.png\"></a>\n<a href=\"https://www.svix.com/\" target=\"_blank\" title=\"Svix - Webhooks as a service\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/svix.svg\"></a>\n<a href=\"https://www.codacy.com/?utm_source=github&utm_medium=sponsors&utm_id=pioneers\" target=\"_blank\" title=\"Take code reviews from hours to minutes\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/codacy.png\"></a>\n<a href=\"https://www.stainlessapi.com/?utm_source=fastapi&utm_medium=referral\" target=\"_blank\" title=\"Stainless | Generate best-in-class SDKs\"><img src=\"https://fastapi.tiangolo.com/img/sponsors/stainless.png\"></a>\n\n<!-- /sponsors -->\n\n<a href=\"https://fastapi.tiangolo.com/fastapi-people/#sponsors\" class=\"external-link\" target=\"_blank\">Other sponsors</a>\n\n## Opinions\n\n\"_[...] I'm using **FastAPI** a ton these days. [...] I'm actually planning to use it for all of my team's **ML services at Microsoft**. Some of them are getting integrated into the core **Windows** product and some **Office** products._\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Kabir Khan - <strong>Microsoft</strong> <a href=\"https://github.com/fastapi/fastapi/pull/26\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_We adopted the **FastAPI** library to spawn a **REST** server that can be queried to obtain **predictions**. [for Ludwig]_\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Piero Molino, Yaroslav Dudin, and Sai Sumanth Miryala - <strong>Uber</strong> <a href=\"https://eng.uber.com/ludwig-v0-2/\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_**Netflix** is pleased to announce the open-source release of our **crisis management** orchestration framework: **Dispatch**! [built with **FastAPI**]_\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Kevin Glisson, Marc Vilanova, Forest Monsen - <strong>Netflix</strong> <a href=\"https://netflixtechblog.com/introducing-dispatch-da4b8a2a8072\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_I\u2019m over the moon excited about **FastAPI**. It\u2019s so fun!_\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Brian Okken - <strong><a href=\"https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855\" target=\"_blank\">Python Bytes</a> podcast host</strong> <a href=\"https://twitter.com/brianokken/status/1112220079972728832\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Timothy Crosley - <strong><a href=\"https://github.com/hugapi/hug\" target=\"_blank\">Hug</a> creator</strong> <a href=\"https://news.ycombinator.com/item?id=19455465\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_If you're looking to learn one **modern framework** for building REST APIs, check out **FastAPI** [...] It's fast, easy to use and easy to learn [...]_\"\n\n\"_We've switched over to **FastAPI** for our **APIs** [...] I think you'll like it [...]_\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Ines Montani - Matthew Honnibal - <strong><a href=\"https://explosion.ai\" target=\"_blank\">Explosion AI</a> founders - <a href=\"https://spacy.io\" target=\"_blank\">spaCy</a> creators</strong> <a href=\"https://twitter.com/_inesmontani/status/1144173225322143744\" target=\"_blank\"><small>(ref)</small></a> - <a href=\"https://twitter.com/honnibal/status/1144031421859655680\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n\"_If anyone is looking to build a production Python API, I would highly recommend **FastAPI**. It is **beautifully designed**, **simple to use** and **highly scalable**, it has become a **key component** in our API first development strategy and is driving many automations and services such as our Virtual TAC Engineer._\"\n\n<div style=\"text-align: right; margin-right: 10%;\">Deon Pillsbury - <strong>Cisco</strong> <a href=\"https://www.linkedin.com/posts/deonpillsbury_cisco-cx-python-activity-6963242628536487936-trAp/\" target=\"_blank\"><small>(ref)</small></a></div>\n\n---\n\n## **Typer**, the FastAPI of CLIs\n\n<a href=\"https://typer.tiangolo.com\" target=\"_blank\"><img src=\"https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg\" style=\"width: 20%;\"></a>\n\nIf you are building a <abbr title=\"Command Line Interface\">CLI</abbr> app to be used in the terminal instead of a web API, check out <a href=\"https://typer.tiangolo.com/\" class=\"external-link\" target=\"_blank\">**Typer**</a>.\n\n**Typer** is FastAPI's little sibling. And it's intended to be the **FastAPI of CLIs**. \u2328\ufe0f \ud83d\ude80\n\n## Requirements\n\nFastAPI stands on the shoulders of giants:\n\n* <a href=\"https://www.starlette.io/\" class=\"external-link\" target=\"_blank\">Starlette</a> for the web parts.\n* <a href=\"https://docs.pydantic.dev/\" class=\"external-link\" target=\"_blank\">Pydantic</a> for the data parts.\n\n## Installation\n\nCreate and activate a <a href=\"https://fastapi.tiangolo.com/virtual-environments/\" class=\"external-link\" target=\"_blank\">virtual environment</a> and then install FastAPI:\n\n<div class=\"termy\">\n\n```console\n$ pip install \"fastapi[standard]\"\n\n---> 100%\n```\n\n</div>\n\n**Note**: Make sure you put `\"fastapi[standard]\"` in quotes to ensure it works in all terminals.\n\n## Example\n\n### Create it\n\n* Create a file `main.py` with:\n\n```Python\nfrom typing import Union\n\nfrom fastapi import FastAPI\n\napp = FastAPI()\n\n\n@app.get(\"/\")\ndef read_root():\n return {\"Hello\": \"World\"}\n\n\n@app.get(\"/items/{item_id}\")\ndef read_item(item_id: int, q: Union[str, None] = None):\n return {\"item_id\": item_id, \"q\": q}\n```\n\n<details markdown=\"1\">\n<summary>Or use <code>async def</code>...</summary>\n\nIf your code uses `async` / `await`, use `async def`:\n\n```Python hl_lines=\"9 14\"\nfrom typing import Union\n\nfrom fastapi import FastAPI\n\napp = FastAPI()\n\n\n@app.get(\"/\")\nasync def read_root():\n return {\"Hello\": \"World\"}\n\n\n@app.get(\"/items/{item_id}\")\nasync def read_item(item_id: int, q: Union[str, None] = None):\n return {\"item_id\": item_id, \"q\": q}\n```\n\n**Note**:\n\nIf you don't know, check the _\"In a hurry?\"_ section about <a href=\"https://fastapi.tiangolo.com/async/#in-a-hurry\" target=\"_blank\">`async` and `await` in the docs</a>.\n\n</details>\n\n### Run it\n\nRun the server with:\n\n<div class=\"termy\">\n\n```console\n$ fastapi dev main.py\n\n \u256d\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 FastAPI CLI - Development mode \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n \u2502 \u2502\n \u2502 Serving at: http://127.0.0.1:8000 \u2502\n \u2502 \u2502\n \u2502 API docs: http://127.0.0.1:8000/docs \u2502\n \u2502 \u2502\n \u2502 Running in development mode, for production use: \u2502\n \u2502 \u2502\n \u2502 fastapi run \u2502\n \u2502 \u2502\n \u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\nINFO: Will watch for changes in these directories: ['/home/user/code/awesomeapp']\nINFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)\nINFO: Started reloader process [2248755] using WatchFiles\nINFO: Started server process [2248757]\nINFO: Waiting for application startup.\nINFO: Application startup complete.\n```\n\n</div>\n\n<details markdown=\"1\">\n<summary>About the command <code>fastapi dev main.py</code>...</summary>\n\nThe command `fastapi dev` reads your `main.py` file, detects the **FastAPI** app in it, and starts a server using <a href=\"https://www.uvicorn.org\" class=\"external-link\" target=\"_blank\">Uvicorn</a>.\n\nBy default, `fastapi dev` will start with auto-reload enabled for local development.\n\nYou can read more about it in the <a href=\"https://fastapi.tiangolo.com/fastapi-cli/\" target=\"_blank\">FastAPI CLI docs</a>.\n\n</details>\n\n### Check it\n\nOpen your browser at <a href=\"http://127.0.0.1:8000/items/5?q=somequery\" class=\"external-link\" target=\"_blank\">http://127.0.0.1:8000/items/5?q=somequery</a>.\n\nYou will see the JSON response as:\n\n```JSON\n{\"item_id\": 5, \"q\": \"somequery\"}\n```\n\nYou already created an API that:\n\n* Receives HTTP requests in the _paths_ `/` and `/items/{item_id}`.\n* Both _paths_ take `GET` <em>operations</em> (also known as HTTP _methods_).\n* The _path_ `/items/{item_id}` has a _path parameter_ `item_id` that should be an `int`.\n* The _path_ `/items/{item_id}` has an optional `str` _query parameter_ `q`.\n\n### Interactive API docs\n\nNow go to <a href=\"http://127.0.0.1:8000/docs\" class=\"external-link\" target=\"_blank\">http://127.0.0.1:8000/docs</a>.\n\nYou will see the automatic interactive API documentation (provided by <a href=\"https://github.com/swagger-api/swagger-ui\" class=\"external-link\" target=\"_blank\">Swagger UI</a>):\n\n\n\n### Alternative API docs\n\nAnd 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>.\n\nYou will see the alternative automatic documentation (provided by <a href=\"https://github.com/Rebilly/ReDoc\" class=\"external-link\" target=\"_blank\">ReDoc</a>):\n\n\n\n## Example upgrade\n\nNow modify the file `main.py` to receive a body from a `PUT` request.\n\nDeclare the body using standard Python types, thanks to Pydantic.\n\n```Python hl_lines=\"4 9-12 25-27\"\nfrom typing import Union\n\nfrom fastapi import FastAPI\nfrom pydantic import BaseModel\n\napp = FastAPI()\n\n\nclass Item(BaseModel):\n name: str\n price: float\n is_offer: Union[bool, None] = None\n\n\n@app.get(\"/\")\ndef read_root():\n return {\"Hello\": \"World\"}\n\n\n@app.get(\"/items/{item_id}\")\ndef read_item(item_id: int, q: Union[str, None] = None):\n return {\"item_id\": item_id, \"q\": q}\n\n\n@app.put(\"/items/{item_id}\")\ndef update_item(item_id: int, item: Item):\n return {\"item_name\": item.name, \"item_id\": item_id}\n```\n\nThe `fastapi dev` server should reload automatically.\n\n### Interactive API docs upgrade\n\nNow go to <a href=\"http://127.0.0.1:8000/docs\" class=\"external-link\" target=\"_blank\">http://127.0.0.1:8000/docs</a>.\n\n* The interactive API documentation will be automatically updated, including the new body:\n\n\n\n* Click on the button \"Try it out\", it allows you to fill the parameters and directly interact with the API:\n\n\n\n* Then click on the \"Execute\" button, the user interface will communicate with your API, send the parameters, get the results and show them on the screen:\n\n\n\n### Alternative API docs upgrade\n\nAnd 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>.\n\n* The alternative documentation will also reflect the new query parameter and body:\n\n\n\n### Recap\n\nIn summary, you declare **once** the types of parameters, body, etc. as function parameters.\n\nYou do that with standard modern Python types.\n\nYou don't have to learn a new syntax, the methods or classes of a specific library, etc.\n\nJust standard **Python**.\n\nFor example, for an `int`:\n\n```Python\nitem_id: int\n```\n\nor for a more complex `Item` model:\n\n```Python\nitem: Item\n```\n\n...and with that single declaration you get:\n\n* Editor support, including:\n * Completion.\n * Type checks.\n* Validation of data:\n * Automatic and clear errors when the data is invalid.\n * Validation even for deeply nested JSON objects.\n* <abbr title=\"also known as: serialization, parsing, marshalling\">Conversion</abbr> of input data: coming from the network to Python data and types. Reading from:\n * JSON.\n * Path parameters.\n * Query parameters.\n * Cookies.\n * Headers.\n * Forms.\n * Files.\n* <abbr title=\"also known as: serialization, parsing, marshalling\">Conversion</abbr> of output data: converting from Python data and types to network data (as JSON):\n * Convert Python types (`str`, `int`, `float`, `bool`, `list`, etc).\n * `datetime` objects.\n * `UUID` objects.\n * Database models.\n * ...and many more.\n* Automatic interactive API documentation, including 2 alternative user interfaces:\n * Swagger UI.\n * ReDoc.\n\n---\n\nComing back to the previous code example, **FastAPI** will:\n\n* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.\n* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.\n * If it is not, the client will see a useful, clear error.\n* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.\n * As the `q` parameter is declared with `= None`, it is optional.\n * Without the `None` it would be required (as is the body in the case with `PUT`).\n* For `PUT` requests to `/items/{item_id}`, read the body as JSON:\n * Check that it has a required attribute `name` that should be a `str`.\n * Check that it has a required attribute `price` that has to be a `float`.\n * Check that it has an optional attribute `is_offer`, that should be a `bool`, if present.\n * All this would also work for deeply nested JSON objects.\n* Convert from and to JSON automatically.\n* Document everything with OpenAPI, that can be used by:\n * Interactive documentation systems.\n * Automatic client code generation systems, for many languages.\n* Provide 2 interactive documentation web interfaces directly.\n\n---\n\nWe just scratched the surface, but you already get the idea of how it all works.\n\nTry changing the line with:\n\n```Python\n return {\"item_name\": item.name, \"item_id\": item_id}\n```\n\n...from:\n\n```Python\n ... \"item_name\": item.name ...\n```\n\n...to:\n\n```Python\n ... \"item_price\": item.price ...\n```\n\n...and see how your editor will auto-complete the attributes and know their types:\n\n\n\nFor a more complete example including more features, see the <a href=\"https://fastapi.tiangolo.com/tutorial/\">Tutorial - User Guide</a>.\n\n**Spoiler alert**: the tutorial - user guide includes:\n\n* Declaration of **parameters** from other different places as: **headers**, **cookies**, **form fields** and **files**.\n* How to set **validation constraints** as `maximum_length` or `regex`.\n* A very powerful and easy to use **<abbr title=\"also known as components, resources, providers, services, injectables\">Dependency Injection</abbr>** system.\n* Security and authentication, including support for **OAuth2** with **JWT tokens** and **HTTP Basic** auth.\n* More advanced (but equally easy) techniques for declaring **deeply nested JSON models** (thanks to Pydantic).\n* **GraphQL** integration with <a href=\"https://strawberry.rocks\" class=\"external-link\" target=\"_blank\">Strawberry</a> and other libraries.\n* Many extra features (thanks to Starlette) as:\n * **WebSockets**\n * extremely easy tests based on HTTPX and `pytest`\n * **CORS**\n * **Cookie Sessions**\n * ...and more.\n\n## Performance\n\nIndependent TechEmpower benchmarks show **FastAPI** applications running under Uvicorn as <a href=\"https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l=zijzen-7\" class=\"external-link\" target=\"_blank\">one of the fastest Python frameworks available</a>, only below Starlette and Uvicorn themselves (used internally by FastAPI). (*)\n\nTo understand more about it, see the section <a href=\"https://fastapi.tiangolo.com/benchmarks/\" class=\"internal-link\" target=\"_blank\">Benchmarks</a>.\n\n## Dependencies\n\nFastAPI depends on Pydantic and Starlette.\n\n### `standard` Dependencies\n\nWhen you install FastAPI with `pip install \"fastapi[standard]\"` it comes the `standard` group of optional dependencies:\n\nUsed by Pydantic:\n\n* <a href=\"https://github.com/JoshData/python-email-validator\" target=\"_blank\"><code>email-validator</code></a> - for email validation.\n\nUsed by Starlette:\n\n* <a href=\"https://www.python-httpx.org\" target=\"_blank\"><code>httpx</code></a> - Required if you want to use the `TestClient`.\n* <a href=\"https://jinja.palletsprojects.com\" target=\"_blank\"><code>jinja2</code></a> - Required if you want to use the default template configuration.\n* <a href=\"https://github.com/Kludex/python-multipart\" target=\"_blank\"><code>python-multipart</code></a> - Required if you want to support form <abbr title=\"converting the string that comes from an HTTP request into Python data\">\"parsing\"</abbr>, with `request.form()`.\n\nUsed by FastAPI / Starlette:\n\n* <a href=\"https://www.uvicorn.org\" target=\"_blank\"><code>uvicorn</code></a> - for the server that loads and serves your application. This includes `uvicorn[standard]`, which includes some dependencies (e.g. `uvloop`) needed for high performance serving.\n* `fastapi-cli` - to provide the `fastapi` command.\n\n### Without `standard` Dependencies\n\nIf you don't want to include the `standard` optional dependencies, you can install with `pip install fastapi` instead of `pip install \"fastapi[standard]\"`.\n\n### Additional Optional Dependencies\n\nThere are some additional dependencies you might want to install.\n\nAdditional optional Pydantic dependencies:\n\n* <a href=\"https://docs.pydantic.dev/latest/usage/pydantic_settings/\" target=\"_blank\"><code>pydantic-settings</code></a> - for settings management.\n* <a href=\"https://docs.pydantic.dev/latest/usage/types/extra_types/extra_types/\" target=\"_blank\"><code>pydantic-extra-types</code></a> - for extra types to be used with Pydantic.\n\nAdditional optional FastAPI dependencies:\n\n* <a href=\"https://github.com/ijl/orjson\" target=\"_blank\"><code>orjson</code></a> - Required if you want to use `ORJSONResponse`.\n* <a href=\"https://github.com/esnme/ultrajson\" target=\"_blank\"><code>ujson</code></a> - Required if you want to use `UJSONResponse`.\n\n## License\n\nThis project is licensed under the terms of the MIT license.\n",
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