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A port of the Django debug toolbar to Flask

Project description

Flask Debug-toolbar

This is a port of the excellent django-debug-toolbar for Flask applications.


Installing is simple with pip:

$ pip install flask-debugtoolbar


Setting up the debug toolbar is simple:

from flask import Flask
from flask_debugtoolbar import DebugToolbarExtension

app = Flask(__name__)

# the toolbar is only enabled in debug mode:
app.debug = True

# set a 'SECRET_KEY' to enable the Flask session cookies
app.config['SECRET_KEY'] = '<replace with a secret key>'

toolbar = DebugToolbarExtension(app)

The toolbar will automatically be injected into Jinja templates when debug mode is on. In production, setting app.debug = False will disable the toolbar.

See the documentation for more information.


0.9.1 (2014-11-24)


  • Fix SQL queries with byte strings on Python 3

  • Fix displaying values whose repr() contains unprintable characters

0.9.0 (2014-01-03)


  • Python 3 compatibility (#54, thanks justinmayer and jmagnusson)

  • Support .init_app() (#38)

  • New “Config” panel displaying Flask config values (#51, thanks Alexey Diyan)

  • Better PEP8-style formatting (#63, thanks Ivan Ivaschenko)


  • Fix template editor with non-ASCII templates (#46)

0.8 (2013-02-21)


  • Use itsdangerous to sign SQL queries

  • Expose the jQuery object as fldt.$ so extensions can use the toolbar’s copy of jQuery (#42)


  • Don’t intercept redirects on XHR requests (#41)

  • Fix SQL query time display as milliseconds (#36)

  • Fix functools.partial error (#35)

  • Fix werkzeug request logging with logging panel (#33)

  • Fix SQL panel unicode encoding error (#31)

0.7.1 (2012-05-18)


  • loading template editor in-place over current page

0.7 (2012-05-18)


  • Add an in-browser template editor to the template panel

  • DEBUG_TB_PROFILER_ENABLED config option to enable the profiler on all requests (normally it is user-enabled by clicking the checkmark) (2012-04-16)

New release to add missing changelog for 0.6.3

0.6.3 (2012-04-16)


  • Compatibility with Flask-SQLAlchemy 0.16 package name

0.6.2 (2012-02-18)


  • Installation issue on Windows with trailing slashes in

  • JavaScript error when using conditional comments for <html> tag (like in HTML5 Boilerplate)

0.6.1 (2012-02-15)


  • Memory leak when toolbar was enabled

  • UnicodeDecodeError when request data contained binary data (e.g. session values)


  • DEBUG_TB_ENABLED config setting to explicitly enable or disable the toolbar

  • DEBUG_TB_HOSTS config setting to enable toolbar only for specific remote hosts

  • New logo for Flask instead of Django

  • Monospaced font on table data

Thanks to kennethreitz and joeshaw for their contributions.

0.6 (2012-01-04)

Flask 0.8 or higher is required


  • Flask 0.8 compatibility

Thanks to mvantellingen

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