Flask DebugToolbar

Flask DebugToolbar is a debugging toolbar extension for Flask. It provides useful information on request/response cycle, database queries, template rendering, and more. With Flask DebugToolbar, developers can quickly identify and fix common issues in Flask applications.

Installation

Flask DebugToolbar can be installed via pip:

pip install Flask-DebugToolbar

Setup

To use Flask DebugToolbar, simply create an instance of DebugToolbarExtension in your Flask application:

from flask import Flask
from flask_debugtoolbar import DebugToolbarExtension

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key_here'
toolbar = DebugToolbarExtension(app)

Then, add debug_toolbar.middleware.DebugToolbarMiddleware to your application middleware:

if app.debug:
    from debug_toolbar.middleware import DebugToolbarMiddleware
    app.wsgi_app = DebugToolbarMiddleware(app.wsgi_app, toolbar)

Features

Flask DebugToolbar provides many useful features for debugging Flask applications:

Request/Response Cycle

Flask DebugToolbar shows detailed information on the request/response cycle, including:

• Request method and URL
• Request headers
• Request form data
• Request JSON data
• Response headers
• Response body

This information can be very helpful in identifying issues with Flask applications.

Database Queries

Flask DebugToolbar shows all database queries made during a request/response cycle, including:

• Query SQL
• Query parameters
• Query duration

This information can be used to optimize database performance and identify slow queries.

Template Rendering

Flask DebugToolbar shows all template rendering during a request/response cycle, including:

• Template name and path
• Template context variables
• Template rendering duration

This information can be used to optimize template rendering and identify slow templates.

Logs

Flask DebugToolbar shows application logs during a request/response cycle, including:

• Log messages
• Log levels
• Log durations

This information can be used to debug application issues and identify log performance issues.

Conclusion

Flask DebugToolbar is a powerful debugging tool for Flask applications. With its many features, developers can quickly identify and fix common issues in Flask applications. To learn more about Flask DebugToolbar, check out the official documentation.