The Flask integration adds support for the Flask Web Framework.


Install sentry-sdk from PyPI with the flask extra:

$ pip install --upgrade 'sentry-sdk[flask]'


To configure the SDK, initialize it with the integration before or after your app has been initialized:

import sentry_sdk
from flask import Flask
from sentry_sdk.integrations.flask import FlaskIntegration


app = Flask(__name__)


Verify your Sentry installation by creating a route that triggers an error:

def trigger_error():
    division_by_zero = 1 / 0

Visiting this route will trigger an error that will be captured by Sentry.


  • The Sentry Python SDK will install the Flask integration for all of your apps. It hooks into Flaskā€™s signals, not anything on the app object.

  • All unhandled exceptions will be reported. Note that @app.errorhandler(Exception) will prevent all exceptions from being sent to Sentry while @app.errorhandler(500) will not.

  • Request data is attached to all events: HTTP method, URL, headers, form data, JSON payloads. Sentry excludes raw bodies and multipart file uploads. Sentry also excludes personally identifiable information (such as user ids, usernames, cookies, authorization headers, IP addresses) unless you set send_default_pii to True.

  • Each request has a separate scope. Changes to the scope within a view, for example setting a tag, will only apply to events sent as part of the request being handled.

  • If you use flask-login and have set send_default_pii=True in your call to init, user data is attached to the event. Apart from the user ID we will try to access the attributes email and username on your user object to capture some more data.

  • Logging with app.logger or any logger will create breadcrumbs when the Logging integration is enabled (done by default).


You can pass the following keyword arguments to FlaskIntegration():

  • transaction_style:

    def myendpoint():
        return "ok"

    In the above code, you would set the transaction to:

    • /myurl/&lt;foo&gt; if you set transaction_style="url". This matches the behavior of the old Raven SDK.
    • myendpoint if you set transaction_style="endpoint"

    The default is "endpoint".

User Feedback

You can use the user feedback feature with this integration. For more information see User Feedback.

You can edit this page on GitHub.