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.
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View allDNS Records Explained: What Every Developer Should Know
A practical guide to DNS records: A and AAAA resolution, the CNAME apex constraint, SPF/DKIM/DMARC email authentication, TTL strategy, and DNSSEC.
cURL for Developers: The Commands You'll Use Every Day
An engineering guide to cURL: OAuth authentication, multipart binary uploads, TLS handshake debugging, latency profiling, and HTTP header patterns.
Environment Variables and Config Management: A Developer's Guide
A practical guide to environment variables: the 12-Factor App approach, Zod schema validation, Docker ARG vs ENV security, and managing production secrets.
IP Subnetting Demystified: A Practical Guide to CIDR and Subnet Masks
IP subnetting from the ground up: CIDR notation, the binary math behind subnet masks, AWS VPC design, VLSM, and mental-math tricks to skip the tables.
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.