· bug bounty, security, reconnaissance
A focused workflow for mapping a web target, reducing noise, and validating reports without turning reconnaissance into indiscriminate scanning.
· cybersecurity, WebSockets, security
The checks that keep a WebSocket service from trusting a connection just because the handshake succeeded.
· PostgreSQL, Node.js, PgBouncer
Pool defaults that multiply into a connection storm, timeouts that never fire, silent TLS downgrades, and PgBouncer eating prepared statements after deploy.
· Node.js, TypeScript, WebSocket
WebSocket heartbeats, unguarded JSON.parse, missing SIGTERM shutdown, hardcoded secrets, and open CORS: the failure modes that show up after deploy.
· Arch Linux, Windows 11, dual boot
Arch Linux install tutorial for dual-booting with Windows 11: safe partitioning, UEFI, GRUB or systemd-boot, the clock fix, and troubleshooting.
· browser, DNS, rendering
A step-by-step breakdown of what happens when you enter a URL — DNS lookup, TCP handshake, parsing, the critical rendering path, and performance tips.
· JSON, JSON formatter, JSON validator
Fix broken JSON, format API responses, and diff payloads right in your browser — plus the most common JSON syntax errors and how to avoid them.
· MongoDB, aggregation pipeline, database
Learn MongoDB aggregation pipelines step by step — filter with $match, group with $group, unpack arrays with $unwind, and sort results, with real code.
· PostgreSQL, Arch Linux, pacman
Short answer: pacman -S postgresql, initdb -D /var/lib/postgres/data, systemctl enable --now postgresql. Full Arch setup, client install, and the connection fixes that follow.
· JavaScript, regex, regular expressions
Practical JavaScript regex examples for extraction, validation, and replacement — plus how flags work and how to test patterns before they hit production.
· EXIF, image metadata, privacy
EXIF data can expose your location, device, and timestamps. Learn what image metadata contains and how to strip it before sharing — right in your browser.
· Node.js, Express, MongoDB
Build a working URL shortener with Node.js, Express, and MongoDB — project structure, URL validation, short-code generation, redirection, and free deployment.
· Node.js, WebSockets, JWT
Build a production-ready real-time chat app with Node.js WebSockets, JWT auth, bcrypt, rate limiting, and graceful shutdown — full architecture and code.