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• License Expression: BSD-3-Clause
  SPDX License Expression
• Maintainer: Pallets
• Requires: Python >=3.9
• Provides-Extra: async , dotenv

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• Development Status
  • 5 - Production/Stable
• Environment
  • Web Environment
• Framework
  • Flask
• Intended Audience
  • Developers
• Operating System
  • OS Independent
• Programming Language
  • Python
• Topic
  • Internet :: WWW/HTTP :: Dynamic Content
  • Internet :: WWW/HTTP :: WSGI
  • Internet :: WWW/HTTP :: WSGI :: Application
  • Software Development :: Libraries :: Application Frameworks
• Typing
  • Typed

Flask

Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja, and has become one of the most popular Python web application frameworks.

Flask offers suggestions, but doesn't enforce any dependencies or project layout. It is up to the developer to choose the tools and libraries they want to use. There are many extensions provided by the community that make adding new functionality easy.

A Simple Example

# save this as app.py
fromflaskimport Flask

app = Flask(__name__)

@app.route("/")
defhello():
 return "Hello, World!"

$ flask run
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Donate

The Pallets organization develops and supports Flask and the libraries it uses. In order to grow the community of contributors and users, and allow the maintainers to devote more time to the projects, please donate today.

Contributing

See our detailed contributing documentation for many ways to contribute, including reporting issues, requesting features, asking or answering questions, and making PRs.

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• Pallets Projects

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• Download URL: flask-3.1.3.tar.gz
• Upload date: Feb 19, 2026
• Size: 759.0 kB
• Tags: Source
• Uploaded using Trusted Publishing? Yes
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• Download URL: flask-3.1.3-py3-none-any.whl
• Upload date: Feb 19, 2026
• Size: 103.4 kB
• Tags: Python 3
• Uploaded using Trusted Publishing? Yes
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