Flask (web framework)

Flask
DeveloperArmin Ronacher
Release1 April 2010 (2010-04-01)
Stable release
3.1.3 Edit this on Wikidata / 19 February 2026 (19 February 2026)
Written inPython
TypeWeb framework
LicenseBSD 3-clause license
Websitepalletsprojects.com/p/flask/
Repositorygithub.com/pallets/flask

Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries. It has no database abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions. However, Flask supports extensions that can add application features as if they were implemented in Flask itself. Extensions exist for object-relational mappers, form validation, upload handling, various open authentication technologies and several common framework related tools.

Applications that use the Flask framework include Pinterest and LinkedIn.

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