Flask helps prevent Cross-Site Scripting (XSS) with output escaping in Jinja2: using {{ }} auto-escapes user input to block injected scripts, while the safe filter disables escaping and should be used sparingly. The article explains examples and best practices: prefer auto-escaping, validate input server- and client-side, limit safe, and keep dependencies updated to reduce XSS risk.
Step-by-step guide to generating PDFs in a Flask app with ReportLab: prepare Python 3, install Flask/ReportLab, create a basic canvas-based PDF (text and image) saved as example.pdf, expose a /pdf route that calls the generator and returns the file with send_file, then add customization and dynamic data using Jinja2 templates—perfect for invoices, receipts, and multi-page reports.
A practical guide to mastering Flask templates with Jinja2: learn how templating separates presentation from business logic, improves reusability, and powers dynamic pages with placeholders, loops, conditionals, and functions. Walk through setting up the templates folder, using render_template, and iterating over data to build scalable, maintainable Python web apps with confidence.
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