📰 Dev.to · Dev Nestio

I Built a Browser-Based DNS Lookup Tool — A, AAAA, MX, TXT, SOA, CAA, SRV via DNS-over-HTTPS, 149 Tests

I Built a Markdown Table Generator in Pure Vanilla JS — Spreadsheet UI, CSV Import, HTML Output, 129 Tests

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

I Built a Browser-Only HTTP Header Analyzer — Security Scoring, Missing Header Warnings, 147 Tests

I Built a Browser-Only JSON Schema Validator — Draft-07, $ref, allOf/anyOf/oneOf, if/then/else, 173 Tests

I Built a Browser-Only Favicon Generator — Text, Emoji & SVG to ICO/PNG (136 Tests, Zero Dependencies)

I Built a Unit Converter in Pure Vanilla JS — 7 Categories, 70+ Units, 165 Tests, Zero Dependencies

I Built a Text Diff Tool in Pure Vanilla JS — Myers Algorithm from Scratch, 129 Tests, Zero Dependencies

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

I Built a Browser-Only HTML Entity Encoder/Decoder — Named, Decimal & Hex, 246 Tests

I Built a Color Picker & Palette Generator in Pure Vanilla JS — No Libraries, 187 Tests

I Built a QR Code Generator in Pure Vanilla JS — No Libraries, No Server, 202 Tests

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

I Built a Real-Time Regex Tester in the Browser (Capture Groups, Flags, No Libraries)