WASM qr scanner

Note: this is still a beta version of this package so the API may be changing completely until 1.0.0 is out.

This library scans QR codes in the browser using WebAssembly and is 100% written in Rust. Uses the awesome Rust library bardecoder for decoding images with QR codes to their string value. The image data should be provided as base64 data string. In tests it now took about ~80ms for each scan. That includes drawing the current video frame on a canvas, getting the canvas content as a base64 encoded string, sending the data string to wasm and getting a result back. Would like to test this on lower end devices and against other solutions later.

Install

run cargo update

Build

run wasm-pack build --release --target web

Run example

Run the build script first, then run a webserver in the root of this project. For example using npm: run npx serve and navigate to http://localhost:3000/example. Hold up some QR

Running tests

run cargo test and wasm-pack test --node

Roadmap

• add unit tests for basic functions
• add tests for wasm_bindgen functions
• update example html page to use camera
• optimize crate feature flags where possible for smaller wasm size (now ~1mb, which is too large in some cases)
• add benchmarks for slower devices and agains other libraries