Flask Vibe Tutorials
Learn Flask + PostgreSQL + Vanilla JS through practical examples
In-Depth Guides
Long-form field guides drawn from real production experience.
Flask Memory Leaks You Will Hit
Streaming proxies, connection pool traps, unbounded caches, Flask-Limiter pitfalls — and how to diagnose them.
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Flask Security Model
SQL injection, CSRF, session management — how Flask's explicit approach makes security verifiable.
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Deploying Flask to Production
Gunicorn, gevent, nginx, Railway, Render, Fly.io — the full production deployment stack explained.
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Flask in Production: Real Companies
Instagram, Pinterest, Airbnb, Netflix — real deployments, real scale, real architectural lessons.
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Flask vs Next.js Benchmark
Methodology, results, and what the numbers actually mean for your production app.
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WordPress to Static Site with AI
How to migrate a WordPress site to a static Flask-generated site using AI assistance.
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Filters
Modular Vanilla JS That Outperforms Frameworks
In 2026, properly modularised vanilla JavaScript — paired with AI tooling and native browser APIs — matches framework productivity while delivering smaller bundles, zero abstractions, and 100/100 Lighthouse scores. This tutorial shows you the full architecture: reactive state, component pattern, client-side router, and lazy loading.
Pagination: OFFSET and Cursor-Based
Add page-by-page navigation to any Flask listing with LIMIT/OFFSET, then level up to cursor-based pagination for high-performance lists that never slow down.
Deploying Flask to Railway
Take your Flask + PostgreSQL app from localhost to a live Railway deployment. Covers Procfile, gunicorn, managed database setup, and environment variables.
Full-Text Search with PostgreSQL
Add powerful search to your Flask app using PostgreSQL's built-in tsvector and tsquery — no Elasticsearch, no extra service, no extra cost.
Testing Flask Routes with pytest
Write reliable tests for your Flask routes using pytest and Flask's built-in test client. Covers fixtures, test databases, JSON assertions, and mocking external APIs.
Transactional Email with Resend
Send welcome emails, password resets, and notifications from Flask using the Resend API. Keep your routes thin with a reusable utils/email.py helper.
Password Reset Flow
Build a complete forgot-password flow: generate a secure time-limited token, email a reset link, validate it, and update the password safely.
Building a JSON REST API
Build a clean JSON API in Flask with consistent response envelopes, API key authentication via database lookup, and proper HTTP status codes.
File Uploads with Validation
Handle file uploads safely in Flask: validate file types and sizes, use secure_filename, save to disk, and store the path in PostgreSQL.
Localization with Flask-Babel
Translate your Flask app into multiple languages using Flask-Babel. Covers string extraction, .po files, locale detection, and a language switcher.
CSRF Protection in Flask Forms
Understand CSRF attacks and build your own protection from scratch using Python's secrets module — no library needed for most apps.
Flask Authentication: Session-Based Login
Build a complete login system with password hashing, sessions, and route protection — no third-party auth library needed.