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.. _extensions:
Extensions
==========
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 <pypi_>`_.
Using Extensions
----------------
Consult each extension's documentation for installation, configuration,
and usage instructions. Generally, extensions pull their own
configuration from :attr:`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__)
app.config.update(
FOO_BAR='baz',
FOO_SPAM='eggs',
)
foo.init_app(app)
Building Extensions
-------------------
While the `PyPI <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 :doc:`/extensiondev` to develop your own Flask
extension.
.. _pypi: https://pypi.org/search/?c=Framework+%3A%3A+Flask
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