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Extensions are extra packages that add functionality to a Flask application. For example, an extension might add support for sending email or connecting to a database. Some extensions add entire new frameworks to help build certain types of applications, like a REST API.

Finding Extensions

Flask extensions are usually named "Flask-Foo" or "Foo-Flask". You can search PyPI for packages tagged with Framework :: Flask.

Using Extensions

Consult each extension's documentation for installation, configuration, and usage instructions. Generally, extensions pull their own configuration from app.config <flask.Flask.config> and are passed an application instance during initialization. For example, an extension called "Flask-Foo" might be used like this:

from flask_foo import Foo

foo = Foo()

app = Flask(__name__)


Building Extensions

While the PyPI contains many Flask extensions, you may not find an extension that fits your need. If this is the case, you can create your own. Read /extensiondev to develop your own Flask extension.