Dev Tools · 2h ago
Developer Builds QR Code Generator from Scratch in Vanilla JS
A developer created a QR code generator using only vanilla JavaScript, implementing the full Model 2 algorithm without external libraries. The tool supports real-time generation, multiple sizes, error correction levels, and color customization. It includes 202 tests and offers PNG and SVG downloads.
Meridian48 take
While the tool itself is a neat demo, the real value is the deep dive into QR code internals—a rare hands-on approach in an era of npm install.
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I Built a QR Code Generator in Pure Vanilla JS — No Libraries, No Server, 202 Tests →
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