fast_qr is approximately 6-7 times faster than qrcode, see benchmarks
You can create a QR as
- Raw matrix, well suited for custom usage
- Vectorized image, well suited for web usage
- Image, well suited for mobile / print usage
Usage
Rust
Examples
You can run the examples with:
cargo run --example simple
cargo run --example svg -F svg
cargo run --example image -F imageThey are all explained in detail below.
Converts QRCode to Unicode
use fast_qr::convert::ConvertError;
use fast_qr::qr::QRBuilder;
fn main() -> Result<(), ConvertError> {
// QRBuilder::new can fail if content is too big for version,
// please check before unwrapping.
let qrcode = QRBuilder::new("https://example.com/")
.build()
.unwrap();
let str = qrcode.to_str(); // .print() exists
println!("{}", str);
Ok(())
}Converts QRCode to SVG docs.rs
Note: It requires the svg feature
use fast_qr::convert::ConvertError;
use fast_qr::convert::{svg::SvgBuilder, Builder, Shape};
use fast_qr::qr::QRBuilder;
fn main() -> Result<(), ConvertError> {
// QRBuilder::new can fail if content is too big for version,
// please check before unwrapping.
let qrcode = QRBuilder::new("https://example.com/")
.build()
.unwrap();
let _svg = SvgBuilder::default()
.shape(Shape::RoundedSquare)
.to_file(&qrcode, "out.svg");
Ok(())
}Converts QRCode to an image docs.rs
Note: It requires the image feature
use fast_qr::convert::ConvertError;
use fast_qr::convert::{image::ImageBuilder, Builder, Shape};
use fast_qr::qr::QRBuilder;
fn main() -> Result<(), ConvertError> {
// QRBuilder::new can fail if content is too big for version,
// please check before unwrapping.
let qrcode = QRBuilder::new("https://example.com/")
.build()
.unwrap();
let _img = ImageBuilder::default()
.shape(Shape::RoundedSquare)
.background_color([255, 255, 255, 0]) // Handles transparency
.fit_width(600)
.to_file(&qrcode, "out.png");
Ok(())
}JavaScript / Typescript
Installation
npm install --save fast_qr
# Or
yarn add fast_qrCreate an svg
/// Once `init` is called, `qr_svg` can be called any number of times
import init, { qr_svg, SvgOptions, Shape } from '/pkg/fast_qr.js'
const options = new SvgOptions()
.margin(4)
.shape(Shape.Square)
.image("") // Can be a URL or a base64 encoded image
.background_color("#b8a4e5")
.module_color("#ffffff");
// Using then / catch:
init()
.then(() => {
for (let i = 0; i < 10; i++) {
const svg = qr_svg("https://fast-qr.com", options);
console.log(svg);
}
})
.catch(console.error);
// Or using modern async await:
await init();
for (let i = 0; i < 10; i++) {
const svg = qr_svg("https://fast-qr.com", options);
console.log(svg);
}Build WASM
WASM module also exists in NPM registry
Package is named fast_qr and can be installed like so :
npm install --save fast_qr
WASM module might be bundled
Find a bundled version in the latest release.
WASM module can be built from source
./wasm-pack.sh # Runs build in release mode and wasm-opt twice again
wasm-pack pack pkg # Creates an archive of said package
# wasm-pack publish pkg # Creates an archive & publish it to npmBenchmarks
According to the following benchmarks, fast_qr is approximately 6-7x faster than qrcode.
| Benchmark | Lower | Estimate | Upper | |
|---|---|---|---|---|
| V03H/qrcode | 524.30 us | 535.02 us | 547.13 us | |
| V03H/fast_qr | 82.079 us | 82.189 us | 82.318 us | fast_qr is 6.51x faster |
| V10H/qrcode | 2.1105 ms | 2.1145 ms | 2.1186 ms | |
| V10H/fast_qr | 268.70 us | 269.28 us | 269.85 us | fast_qr is 7.85x faster |
| V40H/qrcode | 18.000 ms | 18.037 ms | 18.074 ms | |
| V40H/fast_qr | 2.4313 ms | 2.4362 ms | 2.4411 ms | fast_qr is 7.40x faster |
More benchmarks can be found in /benches folder.