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PyPI · #60 most downloaded on PyPI
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Last release 1 months ago
29 Jul 2026
Ships fairly regularly
a new release about every 2 weeks
Nearly every release is documented
notes for 60 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
8 years old
317 releases · first in 2018
Fix and test constrained large file uploads, referenced issue #2
Fix and test constrained large file uploads, referenced issue #2
```Python from typing import List
from typing import List
from fastapi import FastAPI, Query
app = FastAPI()
@app.get("/items/")
def read_items(q: List[int] = Query(None)):
return {"q": q}
With a URL of /items/?q=5&q=6, q will contain [5, 6].
To define query or header parameters as lists it is necessary to explicitly use Query or Header, otherwise, FastAPI will assume they are request bodies.
FastAPI is fully tested.
The tests cover 100% of the source code.
<a href="https://codecov.io/gh/tiangolo/fastapi" target="_blank"> <img src="https://codecov.io/gh/tiangolo/fastapi/branch/master/graph/badge.svg" alt="Coverage"> </a>
Security utils, like HTTPBasic have checks that directly return HTTP errors to the client when the scheme is invalid or doesn't contain data.
There are new models to contain the value of HTTP security utils, as HTTPBasicCredentials, that contains the decoded username and password.
Several fixes for Python 3.7. For issues that didn't show in Python 3.6.
Several new tutorials and docs.
Improvements to existing docs.
One column per quarter.
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Micro-release, with lots of docs.
Micro-release, with lots of docs.
A whole new "Tutorial - User Guide" section (almost complete).
See the docs at: https://fastapi.tiangolo.com/
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