FastAPI

FastAPI framework, high performance, easy to learn, fast to code, ready for production. 🚀

Web APIs with Python type hints. 🐍

By @tiangolo 🤓

[FastAPI @FastAPI]

Big news: the first-ever ✨ FastAPI Conf ✨ is coming!

📍 Amsterdam
📅 October 28

Meet the FastAPI team, connect with developers ☕️

🎟️ Join the waitlist for early ticket access: https://t.co/O0gYFWxjHJ

[FastAPI @FastAPI]

Optional parameter models in FastAPI 0.159.0 ✨

No dates? No filter.

Send either date? Both are required.

Make the whole Pydantic model optional while keeping its fields required.

Works with query parameters, headers, and cookies. 🚀

https://t.co/sen3LwL7XM

[FastAPI @FastAPI]

And now in FastAPI 0.158.0, support for multiple form models as well 📋️

https://t.co/rGIWxdBcjL

[FastAPI @FastAPI]

Pagination in one model. Filters in another. Both in the same FastAPI endpoint. ✨

FastAPI 0.157.0 lets you combine multiple query parameter models, alongside individual parameters and dependencies.

Works for headers and cookies too. 🚀

https://t.co/K0bHhRlXkz

[FastAPI @FastAPI]

Pagination in one model. Filters in another. Both in the same FastAPI endpoint. ✨

FastAPI 0.157.0 lets you combine multiple query parameter models, alongside individual parameters and dependencies.

Works for headers and cookies too. 🚀

https://t.co/K0bHhRlXkz

[FastAPI @FastAPI]

Several more small bug fix releases in a row (5 just today), the lastest is 0.156.8 🚀

https://t.co/LfpZnNfHCr

[FastAPI @FastAPI]

@abhi16_93 You can wait for a week or a month, and update to the latest version available then, you would get the same developer experience.

And everyone else can benefit from granular releases, where version X might fix something they need, but version X+1 might need more work.

[FastAPI @FastAPI]

FastAPI 0.156.0 fixes defaults when combining Pydantic Field() with Query(), Body(), and other request parameters. ✨

default_factory and validate_default now work as expected.

https://t.co/tpZrmBOuiv

[FastAPI @FastAPI]

FastAPI 0.155.0 removes deprecated extra keyword arguments from request parameters. 🔥

Typos now raise an error instead of silently becoming schema metadata.

For custom schema properties, use json_schema_extra.

https://t.co/AvB0x96twh

[FastAPI @FastAPI]

FastAPI 0.154.0 adds explicit support for Pydantic's validate_default, union_mode, and fail_fast in request parameters. ✨

More control over validation, with editor autocomplete and type checking.

https://t.co/tpZrmBOuiv

[FastAPI @FastAPI]

FastAPI 0.153.0 improves browser form handling for unions of Pydantic models. 🐛

Empty inputs, unchecked checkboxes, and unselected files now behave consistently with single form models.

https://t.co/bQprl3HvLX

[FastAPI @FastAPI]

FastAPI 0.152.0 🐛

Validation errors for header parameter models now use the HTTP header name: "save-data" instead of "save_data".

Easier to see which header is missing or invalid. ✨

https://t.co/tpZrmBOuiv

[FastAPI @FastAPI]

FastAPI 0.151.0 🐛

Individual Body parameters now distinguish JSON null from missing values.

Omit a value to use its default. Send null to get None if the type allows it, or a validation error otherwise.

https://t.co/tpZrmBNWsX

[FastAPI @FastAPI]

And one more! 🐛

FastAPI 0.150.0 treats unselected file inputs as missing.

Required fields produce validation errors. Fields with defaults use them.

Selected empty files still work. ✅

https://t.co/tpZrmBNWsX

[FastAPI @FastAPI]

How many releases can you take in a day?

FastAPI 0.149.0 has more form fixes! 🐛

Empty text inputs from browser forms now use defaults.

Required fields still produce validation errors.

JSON behavior is unchanged.

https://t.co/Lp7abFg6Cf

[FastAPI @FastAPI]

FastAPI 0.148.0 is out! 🐛

More consistent defaults for query, header, cookie, and form models:

* Factories run once
* Default fields stay unset
* Default validation is opt-in

Compatibility notes:
https://t.co/J9ASTZ5Abk

[FastAPI @FastAPI]

FastAPI 0.147.0 improves HTML checkbox handling ✅

Omitted boolean form fields now become False, even with a True or None default.

This matches how browsers handle unchecked checkboxes.

Works with form models too. JSON is unchanged.

https://t.co/gRA5GP27rG

[FastAPI @FastAPI]

Breaking change in FastAPI 0.146.0 ⛔️

The root_path parameter is now deprecated in favor of:

fastapi run --root-path /your/proxy/path

(or equivalents)

More in line with the ASGI standard 🤓

https://t.co/tO5Ey1tPdG

[FastAPI @FastAPI]

FastAPI 0.144.0 adds WebSocket support to security dependencies 🔒️

Thanks @usrbinmix ! 🙌

https://t.co/ZH1k0USk1W

[FastAPI @FastAPI]

They just released session management for the Redis SDK for FastAPI 🎉

Wanna learn about it all? Come to FastAPI Conf! Hear it all directly from the source.

https://t.co/ioc3vjSHvX

[Tihomir Mateev @tishun]

Advanced session management of your @FastAPI endpoints using @Redisinc, based on the #Starlette framework?

As easy as 𝙵𝚊𝚜𝚝𝙰𝙿𝙸𝚁𝚎𝚍𝚒𝚜(𝚊𝚙𝚙).𝚕𝚒𝚏𝚎𝚜𝚙𝚊𝚗().𝚜𝚎𝚜𝚜𝚒𝚘𝚗𝚜()

🕺🏼 Voilà! 🕺🏼

🔗 https://t.co/3THroOXsWf

[FastAPI @FastAPI]

Meet the FastAPI Conf master of ceremonies: @judy2k 🎙️

https://t.co/kAYorhRikl

[FastAPI @FastAPI]

We'll have a blast in the FastAPI Conf after party 🕹️🥳

https://t.co/FUhjua2Qct