FastAPI
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|
| FastAPI | |
|---|---|
| Developer(s) | Sebastián Ramírez |
| Initial release | December 5, 2018[1] |
| Stable release | 0.115.13[2] 
/ 17 June 2025 |
| Repository | github |
| Written in | Python |
| Type | Web framework |
| License | MIT |
| Website | fastapi |
FastAPI is a modern web framework first released in 2018 for building RESTful APIs in Python. 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.[3]
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.[4]
Starlette
Starlette is a lightweight ASGI framework/toolkit, to support async functionality in Python.[5]
Uvicorn
Uvicorn is a minimal low-level server/application web server for async frameworks, following the ASGI specification.
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!"
See also
- Django
- Flask
- Pylons project
- Web2py
- Tornado
- Comparison of web frameworks
- Representational state transfer
- Python (programming language)
External links
References
- ^ "fastapi repo". GitHub. 2018-12-05.
- ^ "Release 0.115.13". 17 June 2025. Retrieved 18 June 2025.
- ^ 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.
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