Werkzeug

The comprehensive WSGI web application library.

werkzeug Permissive license BSD-3-Clause Active ★ 6,876 v3.1.8 released 2026-04-02

Install

werkzeug on PyPI

pip

pip install werkzeug

uv

uv add werkzeug

poetry

poetry add werkzeug

Package facts

License	BSD-3-Clause (permissive)
Python support	supports the current Python release (>=3.9)
Install friction	low — pure-Python wheel
Runtime dependencies	1 — markupsafe
Maintenance	actively maintained — 133 days since the last release
Last repo commit	2026-08-13
First released	2007-12-09
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: werkzeug-3.1.8-py3-none-any.whl

Development Status :: 5 - Production/StableEnvironment :: Web EnvironmentIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: PythonTopic :: Internet :: WWW/HTTP :: Dynamic ContentTopic :: Internet :: WWW/HTTP :: WSGITopic :: Internet :: WWW/HTTP :: WSGI :: ApplicationTopic :: Internet :: WWW/HTTP :: WSGI :: MiddlewareTopic :: Software Development :: Libraries :: Application FrameworksTyping :: Typed

About Werkzeug

from the package's own PyPI description — quoted content, verbatim

Werkzeug

werkzeug German noun: "tool". Etymology: werk ("work"), zeug ("stuff")

Werkzeug is a comprehensive [WSGI][] web application library. It began as a simple collection of various utilities for WSGI applications and has become one of the most advanced WSGI utility libraries.

It includes:

An interactive debugger that allows inspecting stack traces and source code in the browser with an interactive interpreter for any frame in the stack.
A full-featured request object with objects to interact with headers, query args, form data, files, and cookies.
A response object that can wrap other WSGI applications and handle streaming data.
A routing system for matching URLs to endpoints and generating URLs for endpoints, with an extensible system for capturing variables from URLs.
HTTP utilities to handle entity tags, cache control, dates, user agents, cookies, files, and more.
A threaded WSGI server for use while developing applications locally.
A test...

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

Werkzeug is a comprehensive WSGI web application library providing request/response objects, URL routing, an interactive debugger, HTTP utilities, a development server, and a test client for building web applications.

Low friction: pure Python wheel with only markupsafe as a runtime dependency. Actively maintained with recent releases and 6876 GitHub stars; last commit 2026-08-13 signals ongoing development.

BSD-3-Clause permissive license allows commercial and private use with minimal restrictions; suitable for most projects.

Usage

pip install werkzeug
from werkzeug.wrappers import Request, Response
from werkzeug.serving import run_simple

@Request.application
def app(request: Request) -> Response:
    return Response("Hello, World!")

if __name__ == "__main__":
    run_simple("127.0.0.1", 5000, app)

Requires Python 3.9 or later.

Verdict: Werkzeug is a mature, well-maintained WSGI foundation library with no known vulnerabilities, minimal dependencies, and permissive licensing. It is suitable for production use and widely adopted in the Python web ecosystem.

wsgi web application librarypython request response handlingurl routing wsgiweb debugging toolshttp utilities pythonwsgi development serverweb application testing client