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Html5-QRCode

(supports barcodes now :))

A cross-platform HTML5 QR code & barcode reader.

Use this lightweight library to easily / quickly integrate QR code, bar code, and other common code scanning capabilities to your web application.

• Supports easy scanning using an integrated webcam or camera in smartphones (Android / IOS).

• Supports scanning codes from files or default cameras on smartphones.

• Recently Added Supports bar code scanning in various formats.

• Supports two kinds of APIs

  • Html5QrcodeScanner — End-to-end scanner with UI, integrate with less than ten lines of code.
  • Html5Qrcode — Powerful set of APIs you can use to build your UI without worrying about camera setup, handling permissions, reading codes, etc.

Support for scanning local files on the device is a new addition and helpful for the web browser which does not support inline web-camera access in smartphones. Note: This doesn't upload files to any server — everything is done locally.

Demo at scanapp.org	Demo at qrcode.minhazav.dev - Scanning different types of codes

Notice

UX/UXD/UXR help wanted: We are looking to improve user experience of this code scanning library — if you are interested in making this experience better for both developers and end users, please share your ideas, thoughts, inputs in this discussion

Supported platforms

We are working continuously on adding support for more and more platforms. If you find a platform or a browser where the library is not working, please feel free to file an issue. Check the demo link to test it out.

Legends

• Means full support — inline webcam and file based
• Means partial support — only file based, webcam in progress

PC / Mac

Firefox	Chrome	Safari	Opera	Edge

Android

Chrome	Firefox	Edge	Opera	Opera Mini	UC

IOS

Safari	Chrome	Firefox	Edge
	*	*

* Supported for IOS versions >= 15.1

Before version 15.1, Webkit for IOS is used by Chrome, Firefox, and other browsers in IOS and they do not have webcam permissions yet. There is an ongoing issue on fixing the support for iOS - issue/14

Framework support

The library can be easily used with several other frameworks, I have been adding examples for a few of them and would continue to add more.

Html5	VueJs	ElectronJs	React

Supported Code formats

Code scanning is dependent on Zxing-js library. We will be working on top of it to add support for more types of code scanning. If you feel a certain type of code would be helpful to have, please file a feature request.

Code	Example
QR Code
AZTEC
CODE_39
CODE_93
CODE_128
ITF
EAN_13
EAN_8
PDF_417
UPC_A
UPC_E
DATA_MATRIX
MAXICODE*
RSS_14*
RSS_EXPANDED*

*Formats are not supported by our experimental integration with native BarcodeDetector API integration (Read more).

Description - View Demo

See an end to end scanner experience at scanapp.org.

This is a cross-platform JavaScript library to integrate QR code, bar codes & a few other types of code scanning capabilities to your applications running on HTML5 compatible browser.

Supports:

• Querying camera on the device (with user permissions)
• Rendering live camera feed, with easy to use user interface for scanning
• Supports scanning a different kind of QR codes, bar codes and other formats
• Supports selecting image files from the device for scanning codes

How to use

For full information read this article.

Download the script from release page or install using npm with:

npm i html5-qrcode

Add an element you want to use as a placeholder for QR Code scanner

<div id="reader" width="600px"></div>

Ideally do not set the height of this container as the height should depend on the height of the video feed from the camera. The library would honor the existing width, otherwise apply the default width. The height is derived from the aspect ratio of the video feed.

Using directly in browser without any loader

If you are not using any loader, you can get the latest UMD javascript code in production from https://unpkg.com/html5-qrcode.

<script src="https://unpkg.com/html5-qrcode" type="text/javascript">

In case you installed the plugin using npm but still use javascript without any module loader, you can get the minified script in node_modules/html5-qrcode/html5-qrcode.min.js

Using with module loaders

Include the script with

// To use Html5QrcodeScanner (more info below)
import {Html5QrcodeScanner} from "html5-qrcode"

// To use Html5Qrcode (more info below)
import {Html5Qrcode} from "html5-qrcode"

Easy Mode - With end to end scanner user interface

Html5QrcodeScanner lets you implement an end to end scanner with few lines of code with the default user interface which allows scanning using the camera or selecting an image from the file system.

You can set up the scanner as follows:

function onScanSuccess(decodedText, decodedResult) {
  // handle the scanned code as you like, for example:
  console.log(`Code matched = ${decodedText}`, decodedResult);
}

function onScanFailure(error) {
  // handle scan failure, usually better to ignore and keep scanning.
  // for example:
  console.warn(`Code scan error = ${error}`);
}

let html5QrcodeScanner = new Html5QrcodeScanner(
  "reader",
  { fps: 10, qrbox: {width: 250, height: 250} },
  /* verbose= */ false);
html5QrcodeScanner.render(onScanSuccess, onScanFailure);

Pro Mode - if you want to implement your own user interface

You can use Html5Qrcode class to set up your QR code scanner (with your own user interface) and allow users to scan QR codes using the camera or by choosing an image file in the file system or native cameras in smartphones.

You can use the following APIs to fetch camera, start scanning and stop scanning.

For using inline QR Code scanning with Webcam or Smartphone camera

Start Scanning

To get a list of supported cameras, query it using static method Html5Qrcode.getCameras(). This method returns a Promise with a list of devices supported in format { id: "id", label: "label" }.

// This method will trigger user permissions
Html5Qrcode.getCameras().then(devices => {
  /**
   * devices would be an array of objects of type:
   * { id: "id", label: "label" }
   */
  if (devices && devices.length) {
    var cameraId = devices[0].id;
    // .. use this to start scanning.
  }
}).catch(err => {
  // handle err
});

Important: Note that this method will trigger user permission if the user has not granted it already.

Warning: Direct access to the camera is a powerful feature. It requires consent from the user, and your site MUST be on a secure origin (HTTPS).

Warning: Asking for access to the camera on page load will result in most of your users rejecting access to it. More info

Once you have the camera ID from device.id, start camera using Html5Qrcode#start(..). This method returns a Promise with Qr code scanning initiation.

const html5QrCode = new Html5Qrcode(/* element id */ "reader");
html5QrCode.start(
  cameraId, 
  {
    fps: 10,    // Optional, frame per seconds for qr code scanning
    qrbox: { width: 250, height: 250 }  // Optional, if you want bounded box UI
  },
  (decodedText, decodedResult) => {
    // do something when code is read
  },
  (errorMessage) => {
    // parse error, ignore it.
  })
.catch((err) => {
  // Start failed, handle it.
});

You can optionally set another argument in constructor called verbose to print all logs to console

const html5QrCode = new Html5Qrcode("reader", /* verbose= */ true);

Scanning without cameraId

In mobile devices you may want users to directly scan the QR code using the back camera or the front camera for some use cases. For such cases you can avoid using the exact camera device ID that you get from Html5Qrcode.getCameras(). The start() method allows passing constraints in place of camera device ID similar to html5 web API syntax. You can start scanning like mentioned in these examples:

const html5QrCode = new Html5Qrcode("reader");
const qrCodeSuccessCallback = (decodedText, decodedResult) => {
    /* handle success */
};
const config = { fps: 10, qrbox: { width: 250, height: 250 } };

// If you want to prefer front camera
html5QrCode.start({ facingMode: "user" }, config, qrCodeSuccessCallback);

// If you want to prefer back camera
html5QrCode.start({ facingMode: "environment" }, config, qrCodeSuccessCallback);

// Select front camera or fail with `OverconstrainedError`.
html5QrCode.start({ facingMode: { exact: "user"} }, config, qrCodeSuccessCallback);

// Select back camera or fail with `OverconstrainedError`.
html5QrCode.start({ facingMode: { exact: "environment"} }, config, qrCodeSuccessCallback);

Passing the cameraId (recommended approach) is similar to

html5QrCode.start({ deviceId: { exact: cameraId} }, config, qrCodeSuccessCallback);

Stop Scanning

To stop using camera and thus stop scanning, call Html5Qrcode#stop() which returns a Promise for stopping the video feed and scanning.

html5QrCode.stop().then((ignore) => {
  // QR Code scanning is stopped.
}).catch((err) => {
  // Stop failed, handle it.
});

Note that the class is stateful and stop() should be called to properly tear down the video and camera objects safely after calling start() when the scan is over or the user intend to move on. stop() will stop the video feed on the viewfinder.

For QR Code scanning using local files or inbuilt camera on Smartphones

Selector in Android	Selector in IOS
Taken on Pixel 3, Google Chrome	Taken on iPhone 7, Google Chrome

You can alternatively leverage QR Code scanning for local files on the device or default camera on the device. It works similar to inline QR Code scanning.

Define the HTML container and import the JavaScript library as mentioned above

<div id="reader" width="600px" height="600px"></div>
<script src="./dist/html5-qrcode.js"></script>

It's not mandatory to set the height and width of the HTML element. If provided, the library would try to honor it. If it's not set, the library would set a default width and derive the height based on the input image's aspect ratio.

Add an Input element for supporting file selection like this:

<input type="file" id="qr-input-file" accept="image/*">
<!-- 
  Or add captured if you only want to enable smartphone camera, PC browsers will ignore it.
-->

<input type="file" id="qr-input-file" accept="image/*" capture>

Find more information about this at developers.google.com.

And in JavaScript code initialize the object and attach listener like this:

const html5QrCode = new Html5Qrcode(/* element id */ "reader");
// File based scanning
const fileinput = document.getElementById('qr-input-file');
fileinput.addEventListener('change', e => {
  if (e.target.files.length == 0) {
    // No file selected, ignore 
    return;
  }

  const imageFile