FastAPI framework, high performance, easy to learn, fast to code, ready for production FastAPI framework, high performance, easy to learn, fast to code, ready for production Documentation: https://fastapi.tiangolo.com[1]Source Code: https://github.com/tiangolo/fastapi[2]FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ 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[3].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. Completion 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: OpenAPI[4] (previously known as Swagger) and JSON Schema[5].* estimation based on tests on an internal development team, building production applications.Sponsors Other sponsors[6]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."Kabir Khan - Microsoft (ref)[7]---"_We adopted the **FastAPI** library to spawn a **REST** server that can be queried to obtain **predictions**. [for Ludwig]_"Piero Molino, Yaroslav Dudin, and Sai Sumanth Miryala - Uber (ref)[8]---"_**Netflix** is pleased to announce the open-source release of our **crisis management** orchestration framework: **Dispatch**! [built with **FastAPI**]_"Kevin Glisson, Marc Vilanova, Forest Monsen - Netflix (ref)[9]---"_I’m over the moon excited about **FastAPI**. It’s so fun!_"---"_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._"---"_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 [...]_"---## **Typer**, the FastAPI of CLIs If you are building a CLI app to be used in the terminal instead of a web API, check out **Typer**.**Typer** is FastAPI's little sibling. And it's intended to be the **FastAPI of CLIs**. ⌨️ 🚀## RequirementsPython 3.6+FastAPI stands on the shoulders of giants:* Starlette for the web parts.* Pydantic for the data parts.## Installation```console$ pip install fastapi---> 100%```You will also need an ASGI server, for production such as Uvicorn[13] or Hypercorn[14].```console$ pip install uvicorn[standard]---> 100%```ExampleCreate itCreate a file main.py with:```Pythonfrom typing import Optionalfrom fastapi import FastAPIapp = FastAPI()@app.get("/")def read_root(): return {"Hello": "World"}@app.get("/items/{itemid}")def readitem(itemid: int, q: Optional[str] = None): return {"itemid": item_id, "q": q}```Or use async def...If your code uses async / await, use async def:```Python hl_lines="9 14"from typing import Optionalfrom fastapi import FastAPIapp = FastAPI()@app.get("/")async def read_root(): return {"Hello": "World"}@app.get("/items/{itemid}")async def readitem(itemid: int, q: Optional[str] = None): return {"itemid": item_id, "q": q}```Note:If you don't know, check the "In a hurry?" section about async and await in the docs[15].Run itRun the server with:```console$ uvicorn main:app --reloadINFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)INFO: Started reloader process [28720]INFO: Started server process [28722]INFO: Waiting for application startup.INFO: Application startup complete.```About the command uvicorn main:app --reload...The command uvicorn main:app refers to:main: the file main.py (the Python "module").app: the object created inside of main.py with the line app = FastAPI().--reload: make the server restart after code changes. Only do this for development.Check itOpen your browser at http://127.0.0.1:8000/items/5?q=somequery[16].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 operations (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 docsNow go to http://127.0.0.1:8000/docs[17].You will see the automatic interactive API documentation (provided by Swagger UI[18]): Alternative API docsAnd now, go to http://127.0.0.1:8000/redoc[19].You will see the alternative automatic documentation (provided by ReDoc[20]): Example upgradeNow 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 Optionalfrom fastapi import FastAPIfrom pydantic import BaseModelapp = FastAPI()class Item(BaseModel): name: str price: float is_offer: Optional[bool] = Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!("/")def read_root(): return {"Hello": "World"}@app.get("/items/{itemid}")def readitem(itemid: int, q: Optional[str] = None): return {"itemid": item_id, "q": q}@app.put("/items/{itemid}")def updateitem(itemid: int, item: Item): return {"itemname": item.name, "itemid": itemid}```The server should reload automatically (because you added --reload to the uvicorn command above).Interactive API docs upgradeNow go to http://127.0.0.1:8000/docs[21].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 upgradeAnd now, go to http://127.0.0.1:8000/redoc[22].The alternative documentation will also reflect the new query parameter and body: RecapIn 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 3.6+.For example, for an int:Pythonitem_id: intor for a more complex Item model:Pythonitem: Item...and with that single declaration you get:Editor support, including:Validation of data:Automatic and clear errors when the data is invalid.Validation even for deeply nested JSON objects.Conversion of input data: coming from the network to Python data and types. Reading from:JSON.Path parameters.Query parameters.Cookies.Headers.Forms.Files.Conversion 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: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 Tutorial - User Guide[23].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 Dependency Injection 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).Many extra features (thanks to Starlette) as:WebSocketsGraphQLextremely easy tests based on requests and pytestCORSCookie Sessions...and more.PerformanceIndependent TechEmpower benchmarks show FastAPI applications running under Uvicorn as one of the fastest Python frameworks available[24], only below Starlette and Uvicorn themselves (used internally by FastAPI). (*)To understand more about it, see the section Benchmarks[25].Optional DependenciesUsed by Pydantic:Used by Starlette:requests[26] - Required if you want to use the TestClient.aiofiles[27] - Required if you want to use FileResponse or StaticFiles.jinja2[28] - Required if you want to use the default template configuration.python-multipart[29] - Required if you want to support form "parsing", with request.form().itsdangerous[30] - Required for SessionMiddleware support.pyyaml[31] - Required for Starlette's SchemaGenerator support (you probably don't need it with FastAPI).graphene[32] - Required for GraphQLApp support.ujson[33] - Required if you want to use UJSONResponse.Used by FastAPI / Starlette:uvicorn[34] - for the server that loads and serves your application.orjson[35] - Required if you want to use ORJSONResponse.You can install all of these with pip install fastapi[all].LicenseThis project is licensed under the terms of the MIT license. To restore the repository download the bundle wget https://archive.org/download/github.com-tiangolo-fastapi_-_2021-07-18_04-11-28/tiangolo-fastapi_-_2021-07-18_04-11-28.bundle and run: git clone tiangolo-fastapi_-_2021-07-18_04-11-28.bundle Source: https://github.com/tiangolo/fastapi[36]Uploader: tiangolo[37]Upload date: 2021-07-18 [10][11][12]References^ https://fastapi.tiangolo.com (fastapi.tiangolo.com)^ https://github.com/tiangolo/fastapi (github.com)^ One of the fastest Python frameworks available (archive.org)^ OpenAPI (github.com)^ JSON Schema (json-schema.org)^ Other sponsors (fastapi.tiangolo.com)^ (ref) (github.com)^ (ref) (eng.uber.com)^ (ref) (netflixtechblog.com)^ **Typer** (typer.tiangolo.com)^ Starlette (www.starlette.io)^ Pydantic (pydantic-docs.helpmanual.io)^ Uvicorn (www.uvicorn.org)^ Hypercorn (gitlab.com)^ async and await in the docs (fastapi.tiangolo.com)^ http://127.0.0.1:8000/items/5?q=somequery (127.0.0.1)^ http://127.0.0.1:8000/docs (127.0.0.1)^ Swagger UI (github.com)^ http://127.0.0.1:8000/redoc (127.0.0.1)^ ReDoc (github.com)^ http://127.0.0.1:8000/docs (127.0.0.1)^ http://127.0.0.1:8000/redoc (127.0.0.1)^ Tutorial - User Guide (fastapi.tiangolo.com)^ one of the fastest Python frameworks available (www.techempower.com)^ Benchmarks (fastapi.tiangolo.com)^ requests (requests.readthedocs.io)^ aiofiles (github.com)^ jinja2 (jinja.palletsprojects.com)^ python-multipart (andrew-d.github.io)^ itsdangerous (pythonhosted.org)^ pyyaml (pyyaml.org)^ graphene (graphene-python.org)^ ujson (github.com)^ uvicorn (www.uvicorn.org)^ orjson (github.com)^ https://github.com/tiangolo/fastapi (github.com)^ tiangolo (github.com)

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