Developer Guides
110 articlesIn-depth tutorials and best practices for the technologies behind your favorite developer tools — hashing and password storage, image and PDF internals, HTTP and DNS, regular expressions, and the browser APIs the tools are built on.
Written and edited by Necmeddin Cunedioglu. Every article is original to this site, carries a publish date, and is corrected in place when something changes — see the editorial policy.
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Comprehensive Guides
Core Web Vitals in 2026: The Complete INP, LCP, and CLS Optimization Playbook
A practical guide to Core Web Vitals now that INP replaced FID: what LCP, INP, and CLS measure, the thresholds that matter, and how to pass each one.
Generative Engine Optimization (GEO): How to Get Cited by AI Search in 2026
A practical guide to Generative Engine Optimization: how ChatGPT, Google AI Overviews, and Perplexity pick and cite sources — and how to earn the citation.
Prompt Engineering for Developers: Patterns That Actually Work in 2026
A no-hype guide to prompt engineering for real LLM apps: roles, few-shot, chain-of-thought, structured output, RAG, and evaluation patterns that work.
PDF vs DOCX: Structural Document Formats Comparison
PDF vs DOCX architecture: fixed-layout coordinate systems vs reflowable XML text nodes, plus font embedding — and what each format is really for.
Developer Generators: The Tools That Save You Hours Every Week
The generators every developer needs — UUIDs, passwords, QR codes, favicons, meta tags, robots.txt, and .gitignore — and when, why, and how to use each.
The Complete Guide to Browser-Based Image Editing
Image processing in the browser: Canvas drawImage(), Lanczos vs bicubic resampling, EXIF extraction, and local PDF generation — no server uploads.
Time & Date in Programming: The Complete Developer Guide
A developer's guide to handling time: the Unix epoch, the Year 2038 overflow, IANA timezones and DST, ISO 8601, UTC storage, and scheduling with cron.
HTTP Status Codes: The Complete Guide for Developers
A complete guide to HTTP status codes: 401 vs 403, the SEO impact of 301 vs 302, 409 for optimistic locking, and how to monitor 5xx errors properly.
CSS Color Systems: A Complete Guide for Developers
Master CSS color formats — HEX, RGB, HSL, and Color Level 4: when to use each, how to build consistent palettes, and what perceptual uniformity means.
Web Security: Encoding and Hashing Guide
Encoding vs hashing vs encryption: when to use Base64, SHA-256, bcrypt, AES, and HTML entity encoding for web security — with examples and decision trees.
Regular Expressions: The Complete Guide
Master regular expressions from basics to advanced patterns. Learn regex syntax, NFA engine backtracking, lookarounds, capture groups, and real-world examples.
JSON: The Complete Developer Guide
Learn everything about JSON — syntax, data types, parsing mechanics, V8 engine optimizations, schema validation, API best practices, and memory management.
AI Tools
View allNetwork & API
View allWeb Security
View allCORS Errors Explained: Why Your Fetch Call Fails and How to Fix It
A practical guide to CORS: the Same-Origin Policy, debugging OPTIONS preflight, the wildcard-plus-credentials paradox, and fixing it with a reverse proxy.
Password Security: Generation, Hashing, and Storage Best Practices
A guide to password security: information entropy, bcrypt vs Argon2id hashing, salting to defeat rainbow tables, and the current NIST guidelines.
API Rate Limiting: How It Works and How to Handle It
A practical guide to API rate limiting: how token buckets and sliding windows work, implementing them in Redis with Lua, and retry logic with backoff.
Security & Cryptography
View allImage Processing
View allHow to Resize Images for Every Social Media Platform in 2026
Social media image dimensions: exact pixel sizes for Instagram, YouTube, LinkedIn, X, TikTok, and Pinterest, plus scaling vs compression explained.
The Complete Guide to Browser-Based Image Editing
Image processing in the browser: Canvas drawImage(), Lanczos vs bicubic resampling, EXIF extraction, and local PDF generation — no server uploads.
Encoding
View allText Processing
View allWeb Performance
View allTime & Date
View allCSS & Design
View allColor & CSS
View allDeveloper Tools
View allUUID vs NanoID vs ULID: Picking the Right ID for Your Project
A guide to database primary keys: why UUID v4 wrecks B-Tree index performance, NanoID's collision math, and why time-sorted ULIDs and UUIDv7 win.
TypeScript Type Checking: Common Mistakes and How to Fix Them
TypeScript's common type-checking mistakes: discriminated unions, exhaustive checks with never, Zod runtime validation, generics, and strict tsconfig.