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📰 Dev.to · Dev Nestio

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TCP/UDP Port Reference — Searchable Well-Known Port Numbers

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 1mo ago

TCP/UDP Port Reference — Searchable Well-Known Port Numbers

Overview TCP/UDP Port Reference is a searchable table of 100+ well-known and registered...

Roman Numeral Converter — Arabic ↔ Roman up to 3,999,999

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 1mo ago

Roman Numeral Converter — Arabic ↔ Roman up to 3,999,999

Overview Roman Numeral Converter converts between Arabic numbers and Roman numerals. 🔗...

IPv6 Address Calculator: Expand, Compress, Prefix Ranges with BigInt

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 1mo ago

IPv6 Address Calculator: Expand, Compress, Prefix Ranges with BigInt

IPv6's 128-bit address space breaks JavaScript's 53-bit number precision. I built a browser-based...

HTTP Status Code Reference – All 1xx–5xx Codes with Descriptions & Use Cases

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 1mo ago

HTTP Status Code Reference – All 1xx–5xx Codes with Descriptions & Use Cases

HTTP Status Code Reference A complete, searchable reference for every HTTP status code —...

Git Cheatsheet & Command Builder — 60+ commands, searchable, with parameter builder

Dev.to · Dev Nestio 🔧 Backend Engineering 2mo ago

Git Cheatsheet & Command Builder — 60+ commands, searchable, with parameter builder

What I built Added a Git Cheatsheet & Command Builder to devnestio. 👉...

I Built a Browser-Only Timestamp Converter — Epoch ↔ Date, 30+ Timezones, DST-Aware, 124 Tests

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 2mo ago

I Built a Browser-Only Timestamp Converter — Epoch ↔ Date, 30+ Timezones, DST-Aware, 124 Tests

Unix timestamps are everywhere: API responses, log files, database columns, JWT iat/exp fields. But...

I Built a Visual Chmod Calculator in Pure Vanilla JS — Checkboxes ↔ Numeric ↔ Symbolic, 222 Tests

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 2mo ago

I Built a Visual Chmod Calculator in Pure Vanilla JS — Checkboxes ↔ Numeric ↔ Symbolic, 222 Tests

Every Linux and macOS developer has typed chmod 755 on autopilot — but what does 7 actually mean? Why...

I Built a UUID Generator Using crypto.randomUUID() (Why Math.random() Is the Wrong Choice)

Dev.to · Dev Nestio 🔧 Backend Engineering ⚡ AI Lesson 2mo ago

I Built a UUID Generator Using crypto.randomUUID() (Why Math.random() Is the Wrong Choice)

UUID generators are everywhere. Most of them work. But a surprising number use Math.random() under...