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Welcome to Flask

Flask: web development, one drop at a time

Welcome to Flask’s documentation. Get started with Installation and then get an overview with the Quickstart. There is also a more detailed Tutorial that shows how to create a small but complete application with Flask. Common patterns are described in the Patterns for Flask section. The rest of the docs desribe each component of Flask in detail, with a full reference in the API section.

Flask depends on the Jinja template engine and the Werkzeug WSGI toolkit. The documentation for these libraries can be found at:

or from

User’s Guide

This part of the documentation, which is mostly prose, begins with some background information about Flask, then focuses on step-by-step instructions for web development with Flask.

API Reference

If you are looking for information on a specific function, class or method, this part of the documentation is for you.

Additional Notes

Design notes, legal information and changelog are here for the interested.