FastAPI is a

Web framework A web framework (WF) or web application framework (WAF) is a software framework that is designed to support the development of web applications including web services, web resources, and web APIs. Web frameworks provide a standard way to build an ...

for developing RESTful

API An application programming interface (API) is a way for two or more computer programs to communicate with each other. It is a type of software interface, offering a service to other pieces of software. A document or standard that describes how ...

s in Python. FastAPI is based on Pydantic and type hints to validate,

serialize In computing, serialization (or serialisation) is the process of translating a data structure or object state into a format that can be stored (e.g. files in secondary storage devices, data buffers in primary storage devices) or transmitted (e ...

, and deserialize data, and automatically auto-generate OpenAPI documents. It fully supports

asynchronous programming Asynchrony, in computer programming, refers to the occurrence of events independent of the main program flow and ways to deal with such events. These may be "outside" events such as the arrival of signals, or actions instigated by a program that ...

and can run with

Gunicorn The Gunicorn "Green Unicorn" (pronounced jee-unicorn or gun-i-corn) is a Python Web Server Gateway Interface (WSGI) HTTP server. It is a pre-fork worker model, ported from Ruby's Unicorn project. The Gunicorn server is broadly compatible with a ...

and ASGI servers for production such a
Uvicorn
an
Hypercorn
To improve developer-friendliness, editor support was considered since the earliest days of the project.

Adoption and real-world usage

FastAPI was the third most loved web framework in Stack Overflow 2021 Developer Survey. T. Danka stressed its value for

data science Data science is an interdisciplinary field that uses scientific methods, processes, algorithms and systems to extract or extrapolate knowledge and insights from noisy, structured and unstructured data, and apply knowledge from data across a bro ...

applications. It is used by large companies like

Uber Uber Technologies, Inc. (Uber), based in San Francisco, provides mobility as a service, ride-hailing (allowing users to book a car and driver to transport them in a way similar to a taxi), food delivery ( Uber Eats and Postmates), pack ...

and

Netflix Netflix, Inc. is an American subscription video on-demand over-the-top streaming service and production company based in Los Gatos, California. Founded in 1997 by Reed Hastings and Marc Randolph in Scotts Valley, California, it offers a ...

to develop some of their applications.

Example

The following code shows a simple web application that displays "

Hello World ''Hello'' is a salutation or greeting in the English language. It is first attested in writing from 1826. Early uses ''Hello'', with that spelling, was used in publications in the U.S. as early as the 18 October 1826 edition of the '' Norwich ...

!" when visited: from fastapi import FastAPI app = FastAPI() @app.get("/") def read_root(): return

External links

References

Python (programming language) web frameworks {{web-software-stub

Adoption and real-world usage

Example

See also

External links

References