Flask Best Practices
5 min read Quiz at the end
Flask best practices: factory pattern, Blueprints, env config, JWT for APIs, Gunicorn in production.
Flask Best Practices
- Always use the Application Factory pattern
- Split app into Blueprints by feature
- Never hardcode config — use environment variables
- Use Flask-Login for session auth, JWT for API auth
- Always validate and sanitize input (WTForms, marshmallow)
- Use SQLAlchemy with parameterized queries — never raw SQL strings
- Handle errors with
@app.errorhandler - Use
@login_required on all protected routes - Run tests with pytest and Flask test client
- Use Gunicorn + Nginx in production — never
flask run
Topic Quiz · 2 questions
Test your understanding before moving on
1. Flask vs Django — main difference?
💡 Flask gives you the core and freedom; Django includes everything by default.
2. What WSGI server should you use in production?
💡 flask run built-in server is not suitable for production.