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pallets / flask

The Python micro framework for building web applications.

★ 75,111stars on GitHubPythonBSD-3-Clause
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Releases on GitHub (latest 3.1.3, Feb 19, 2026)

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github.com/pallets/flaskIndexed at 49943b5

What is flask?

Flask is a lightweight WSGI web application framework for building Python web applications. It is designed to make getting started quick and easy, and it can scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and is written in Python. Its code health is 7.5 out of 10 (Good), ranked #86 of 4,000+ indexed repos. The last commit to flask was on Oct 30, 2026, and 859 people have contributed.

As of commit 49943b5, indexed Nov 13, 2026. What it is comes from a model reading the README; the rest is measured from the source and git history, not from the maintainer.

For agentsflask.md

Repo facts: type, license, health, rank, contributors
flask facts
TypeCommand-line tool
LicenseBSD-3-Clause
Code health7.5 / 10 (Good)
Health rank#86 of 4,000+ indexed repos
Last commitOct 30, 2026
Contributors859
Bus factor1
Size128 files, 13,377 lines

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pallets/flask FAQ

What is Flask?

Flask is a lightweight WSGI web application framework for building Python web applications. It is designed to make getting started quick and easy and can scale up to complex applications.

How does Flask work?

Flask provides the core request and response pipeline, and you create a Flask application, define routes and view functions, then run it behind a WSGI server. It leaves the choice of other libraries and project layout to the developer.

What language is Flask written in?

Flask is written in Python. Its source code lives in the src/flask directory.

How is the Flask code organized?

The framework lives in src/flask, with app.py defining the application object and json handling JSON serialization. Tests are kept in the tests directory and examples in the examples directory.

When should I use Flask?

Flask suits building Python web applications that start small and may grow to complex applications. It leaves the choice of tools, libraries and project layout to the developer.

What license does Flask use?

Flask is released under the BSD-3-Clause license.

Code health

7.5out of 10Good

Hotspots average 4.7, the place fixes pay off most.

Full health report

On the leaderboards:#4 of 8 Python web frameworks#20 of 64 Python repos

Key features of flask

  • Lightweight WSGI web application framework designed for quick starts and scaling up to complex applications.
  • Built as a simple wrapper around Werkzeug and Jinja.
  • Does not enforce any dependencies or project layout, leaving the choice of tools and libraries to the developer.
  • Community extensions are available for adding new functionality.

How pallets/flask works

The src/flask directory holds the framework itself, including the application object, request handling, and the flask command. src/flask/app.py is the central file and defines the Flask application object, where routing and view execution are handled. src/flask/__init__.py is an entry point that exposes Flask for import, as the README example does with from flask import Flask. src/flask/__main__.py is another entry point for running the package as a module. src/flask/json is the JSON subsystem, which handles serialization and deserialization and routes helpers through the active application context when one is available. A WSGI server calls the application object, and the response it returns is sent back to the client.

The codebase has 128 files and 1,046 symbols in 5 modules, led by Python, Makefile and Shell. Code health is 7.5 out of 10, rated good.