---
id: types-flask
version: "1.1.6"
license: Apache-2.0 license
license_treatment: permissive
maintenance: active
---

# types-Flask — Typing stubs for Flask

License: permissive · Maintenance: active · Downloads: 1.4M/mo

## What it is and what it does

types-Flask is a PEP 561 type stub package that provides type information for the Flask web framework. It allows static type checkers like mypy and PyCharm to understand Flask's API and catch type errors in code that uses Flask. The package is sourced from the typeshed project and depends on three related type stub packages: types-Jinja2, types-Werkzeug, and types-click.

However, this package is largely superseded: Flask has included native type annotations since version 2.0, making types-Flask redundant for modern Flask installations. The package is maintained through typeshed but should only be installed if you are using Flask 1.x or need stubs for an older Flask version.

Use it for:

- Type-checking Flask 1.x applications with mypy or similar tools when native stubs are unavailable.
- Enabling IDE autocomplete and type hints in editors like PyCharm for Flask 1.x projects.
- Validating Flask route handlers and request/response types in legacy codebases before upgrading.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides PEP 561 type stubs for Flask to enable static type checking with mypy, PyCharm, pytype, and similar tools.

No for most users. If you are using Flask 2.0 or later, Flask includes native type annotations and you should not install this package. Only install types-Flask if you are maintaining Flask 1.x code and need type-checking support; otherwise, upgrade Flask and rely on its built-in stubs.

## Install

pip install types-flask
uv add types-flask
poetry add types-flask

## Installing types-Flask

Before you install: Low install friction with three lightweight type-stub runtime dependencies. Maintenance is active with regular updates from the typeshed repository, though the latest release is from 2021-11-26.

License in practice: Licensed under Apache-2.0, a permissive open-source license that allows free use, modification, and distribution with minimal restrictions.

Quickstart:

pip install types-Flask

import flask
app = flask.Flask(__name__)

Flask 2.0 and later include native type annotations; installing types-Flask alongside Flask 2.0+ is redundant and should be avoided.

Verify before relying:

- Whether this package is still actively maintained given the latest release date of 2021-11-26 and the note that Flask 2.0+ includes native stubs.
- Coverage and accuracy of type stubs relative to current Flask versions.

## Package facts

- License: Apache-2.0 license (permissive)
- Python support: unspecified
- Install friction: low
- Maintenance: active
- Downloads: 1.4M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

flask type stubs, flask type checking, mypy flask types, flask type hints, pep 561 stubs, flask static typing, type-stubs, static-typing

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