Need help with flask?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

53.0K Stars 14.0K Forks BSD 3-Clause "New" or "Revised" License 4.1K Commits 21 Opened issues


The Python micro framework for building web applications.

Services available


Need anything else?

Contributors list

No Data


Flask is a lightweight

_ 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
_ and
_ 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.


Install and update using


.. code-block:: text

pip install -U Flask

A Simple Example

.. code-block:: python

from flask import Flask

app = Flask(name)

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

.. code-block:: text

$ env flask run
 * Serving Flask app "hello"
 * Running on (Press CTRL+C to quit)


For guidance on setting up a development environment and how to make a contribution to Flask, see the

contributing guidelines

.. _contributing guidelines:


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,

donate today

.. _please donate today:


  • Website:
  • Documentation:
  • Releases:
  • Code:
  • Issue tracker:
  • Test status:
  • Official chat:

.. _WSGI: .. _Werkzeug: .. _Jinja: .. _pip:

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.