Home page with live JavaScript demo, extensive descriptions, and competitor comparisons: https://www.nayuki.io/page/qr-code-generator-library
Core features:
* Available in 7 programming languages, all with nearly equal functionality: Java, JavaScript, TypeScript, Python, C++, C, Rust
* Significantly shorter code but more documentation comments compared to competing libraries
* Supports encoding all 40 versions (sizes) and all 4 error correction levels, as per the QR Code Model 2 standard
* Output formats: Raw modules/pixels of the QR symbol (all languages), SVG XML string (all languages except C), BufferedImage raster bitmap (Java only), HTML5 canvas (JavaScript and TypeScript only)
* Encodes numeric and special-alphanumeric text in less space than general text
* Open source code under the permissive MIT License