Welcome to Flask — Flask Documentation (3.1.x)
Flask is a lightweight WSGI 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 Werkzeug and Jinja and has become one of the most popular Python web application frameworks.
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Website Key Features
Built-in development server and debugger
Flask comes with a built-in development server and an interactive debugger, making it easier to develop and debug applications.
Integrated support for unit testing
Flask supports unit testing out of the box, allowing developers to write and run tests for their applications easily.
RESTful request dispatching
Flask supports RESTful request dispatching, making it suitable for building REST APIs.
Jinja2 templating
Flask uses Jinja2 templating, which is a modern and designer-friendly templating language for Python, modeled after Django’s templates.
Secure cookies support
Flask supports secure cookies, providing a way to store data on the client side in a secure manner.
Unicode-based
Flask is fully Unicode-based, making it suitable for internationalization and localization of web applications.
Extensive documentation
Flask has extensive documentation, including a quickstart guide, tutorial, and API reference, making it easier for developers to learn and use.
Werkzeug WSGI toolkit
Flask is based on Werkzeug, a WSGI utility library for Python, which provides a solid foundation for web application development.
Flexible configuration
Flask offers a flexible configuration system, allowing developers to configure their applications in various ways.
Extensions
Flask has a rich ecosystem of extensions that add functionality such as form validation, object-relational mapping, and authentication.
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Additional information
License
Flask is licensed under the BSD License.
Creator
Flask was created by Armin Ronacher.
Community
Flask has a large and active community, contributing to its ecosystem of extensions and providing support through various channels.
Performance
Flask is known for its simplicity and performance, making it a popular choice for small to medium web applications and APIs.
Compatibility
Flask is compatible with Python 2.7 and Python 3.5 and above.
HTTP headers
Security headers report is a very important part of user data protection. Learn more about http headers for flask.pocoo.org