FastAPI

FastAPI
Developer(s)	Sebastián Ramírez
Initial release	December 5, 2018; 5 years ago
Stable release	0.111.0 / 3 May 2024; 54 days ago
Repository	github.com/tiangolo/fastapi
Written in	Python
Type	Web framework
License	MIT
Website	fastapi.tiangolo.com

FastAPI is a modern web framework first released in 2018 for building RESTful APIs in Python.^[3] It is used for building APIs with Python 3.8+ based on standard Python-type hints.

FastAPI is based on Pydantic and uses type hints to validate, serialize and deserialize data. It also automatically generates OpenAPI documentation for APIs built with it.^[4]

Components

Pydantic

Pydantic is a data validation library for Python. While writing code in an IDE, Pydantic provides type hints for schema validation and serialization through type annotations.^[5]

Starlette

Starlette is a lightweight ASGI framework/toolkit, to support async functionality in Python.^[6]

Uvicorn

Uvicorn is a minimal low-level server/application web server for async frameworks, following the ASGI specification. Technically, it implements a multi-process model with one main process, which is responsible for managing a pool of worker processes and distributing incoming HTTP requests to them. The number of worker processes is pre-configured, but can also be adjusted up or down at runtime.^[7]

Example

The following code shows a simple web application that displays "Hello World!" when visited:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return "Hello World!"

External links

Official website
fastapi on GitHub

References

^ "fastapi repo". GitHub. 2018-12-05.
^ "Release 0.111.0". 3 May 2024. Retrieved 23 May 2024.
^ "FastAPI". fastapi.tiangolo.com. Retrieved 2024-04-10.
^ Lubanovic, Bill (2019-11-06). Introducing Python: Modern Computing in Simple Packages (2nd ed.). O'Reilly Media, Inc. pp. 397, 418. ISBN 9781492051367.
^ "Why use Pydantic - Pydantic". docs.pydantic.dev. Retrieved 2023-09-21.
^ "Starlette". www.starlette.io. Retrieved 2023-09-21.
^ "Restarting `uvicorn` Workers with the `SIGHUP` Signal". bugfactory.io. Retrieved 2024-06-17.

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[1] "fastapi repo". GitHub. 2018-12-05.

[wikidata-405c36f9e7d6d031807bbc9910b76ea81f6e8118-v13-2] "Release 0.111.0". 3 May 2024. Retrieved 23 May 2024.

[3] "FastAPI". fastapi.tiangolo.com. Retrieved 2024-04-10.

[4] Lubanovic, Bill (2019-11-06). Introducing Python: Modern Computing in Simple Packages (2nd ed.). O'Reilly Media, Inc. pp. 397, 418. ISBN 9781492051367.

[5] "Why use Pydantic - Pydantic". docs.pydantic.dev. Retrieved 2023-09-21.

[6] "Starlette". www.starlette.io. Retrieved 2023-09-21.

[7] "Restarting `uvicorn` Workers with the `SIGHUP` Signal". bugfactory.io. Retrieved 2024-06-17.

[3]