Note that there is no guarantee that the preference can actually be fulfilled. The preference can be either a device id as returned by listCameras or a facing mode specified as 'environment' or 'user'. Handler to be invoked on decoding errors. log ( 'decoded qr code:', result ) ) Īs an optional third parameter an options object can be provided. Create HTMLĬreate a element where the web cam video stream should get rendered:Ĭonst qrScanner = new QrScanner ( videoElem, result => console. Especially if you want to scan from the device's camera, camera support by the browser is the stricter restriction. You will likely not need to use the legacy build though, as general browser support is already very good for the regular build. Note, that the legacy build is larger as it includes some polyfills and, to support browsers that don't support dynamic imports, inlines the worker script which however would be needed to be loaded in legacy browsers anyway. It's a UMD build and can be used as a replacement for, see above. If you need to support old browsers, you can use, which is ECMAScript 2015 (ES6) compatible. This library uses ECMAScript 2017 features like async functions. The development of this library is sponsored by nimiq, world's first browser based blockchain.Ĭonst QrScanner = require ( 'qr-scanner' ) // if installed via package const QrScanner = require ( 'path/to/' ) // if not installed via package // do something with QrScanner The library supports scanning a continuous video stream from a web cam as well as scanning of single images. Also the other library oftentimes misreads the content of QR codes, while for this project no misreads occurred in the benchmarking. Can be configured for better performance on colored QR codes.Īccording to our benchmarking this project's scanner engine's detection rate is about 2-3 times (and up to 8 times) as high as the one of the most popular javascript QR scanner library LazarSoft/jsqrcode.Runs in a WebWorker which keeps the main / UI thread responsive.Improved performance and reduced memory footprint.If the native BarcodeDetector is available, only ~15.3 kB (~5.6 kB gzipped) are loaded. Lightweight: ~59.3 kB (~16.3 kB gzipped) minified with Google's closure compiler.Uses the browser's native BarcodeDetector if available.Web cam scanning support out of the box.In this library, several improvements have been applied over the original port:
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Any unused part of the trial period, if it exists, will be canceled after subscription purchase, where it's applicable.Javascript QR Code Scanner based on Cosmo Wolfe's javascript port of Google's ZXing library. If you want to disable auto renew, you need go to Account Settings after subscription purchase. For 24 hours before the end of subscription period from your account will be charged a payment for subscription renew and the cost of renewal is determined. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. The app will automatically recognize any code your camera is pointing at. There is no need to take a photo or press a button. To scan a QR code or barcode simply open the app, point the camera at the code, and await a few seconds. Supported formats: EQS, QRCode, Data Matrix, Quick Code, EAN 8, Code39, Code128.
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