jsQR | pure javascript QR code reading library. This library takes | QRCode Processing library

 by   cozmo TypeScript Version: 1.4.0 License: Apache-2.0

kandi X-RAY | jsQR Summary

kandi X-RAY | jsQR Summary

jsQR is a TypeScript library typically used in Utilities, QRCode Processing applications. jsQR has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

A pure javascript QR code reading library. This library takes in raw images and will locate, extract and parse any QR code found within.

            kandi-support Support

              jsQR has a medium active ecosystem.
              It has 3282 star(s) with 568 fork(s). There are 77 watchers for this library.
              It had no major release in the last 12 months.
              There are 72 open issues and 96 have been closed. On average issues are closed in 125 days. There are 16 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of jsQR is 1.4.0

            kandi-Quality Quality

              jsQR has 0 bugs and 0 code smells.

            kandi-Security Security

              jsQR has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              jsQR code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              jsQR is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              jsQR releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.
              It has 111 lines of code, 0 functions and 23 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

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            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of jsQR
            Get all kandi verified functions for this library.

            jsQR Key Features

            No Key Features are available at this moment for jsQR.

            jsQR Examples and Code Snippets

            qram,Usage,Receiving Data
            JavaScriptdot img1Lines of Code : 45dot img1License : Permissive (BSD-3-Clause)
            copy iconCopy
            import {Decoder} from 'qram';
            // user selected reader
            import jsQR from 'jsqr';
            // for converting text to binary data
            import * as base64url from 'base64url-universal';
            const decoder = new Decoder();
            // get a video element to read images of qr-codes   
            How to continuously stream video on canvas in React?
            JavaScriptdot img2Lines of Code : 122dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            import React, { Component } from "react";
            import jsQR from "jsqr";
            class WebcamStream extends Component {
              constructor(props) {
                this.state = {
                  isVideoLoading: true
                this.videoTag = React.createRef(
            how to store and validate qr code in server using nodejs and mongoose
            JavaScriptdot img3Lines of Code : 19dot img3License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            use jsqr,jimp we can decode the qr image and we will get data after that one we will compare the db and decoder data....
                    npm i jimp, jsqr 

            Community Discussions


            Why the imagedata returned by upng-js is malformed?
            Asked 2021-Oct-26 at 02:28

            I'm using the upng-js module to read png files. In common sense the return value should be in RGBA form, so should be an Unit8Array with size 4*width*height. However when I'm reading an image with size 111*111 it returns an Unit8Array with size 49395. Here's my code:



            Answered 2021-Oct-26 at 02:28

            At first, let's convert your image to RGBA8 format, then create a Uint8ClampedArray - Input of jsQR.

            Source https://stackoverflow.com/questions/69716293


            Can't figure out how to fix this: "Uncaught TypeError (webcam.snap is not a function)" <-- javascript
            Asked 2021-Jul-14 at 10:10

            I have a JavaScript script that I am getting an error for that I can't figure out. I am trying to take a picture of the webcam feed using JavaScript

            The error is:

            Uncaught TypeError: webcam.snap is not a function

            I am using webcam.js to take the snapshot.

            Here is my JavaScript code:



            Answered 2021-Jul-11 at 15:38

            It seems like either:

            1. the webcam's code are missing (not imported)
              • in this case you need to first call the script from the URL and add it with script tag

            Source https://stackoverflow.com/questions/68089654


            Unhandled Runtime Error - TypeError: Cannot read property 'length' of undefined (Nextjs)
            Asked 2021-Jul-02 at 19:30

            I am writing the code to accept QR-code image and decode into string.

            The image will be static files in the folder 'public' of Nextjs.

            In my code, I have convert my image into 'imageData'. I successfully convert and get 'imageData' object that return with A Uint8ClampedArray.

            Then, I use this npm library to do javascript QR reader. https://www.npmjs.com/package/jsqr

            But, somehow it give me this error back to me.

            Unhandled Runtime Error TypeError: Cannot read property 'length' of undefined

            This is error show in my localhost:3000

            This in when I look in my code editor. I have highlight in line 372.

            Although, I think that line 372 in part of the .next library and I should not have to do anything to it.

            May be it is my code then.

            This my code.




            Answered 2021-Jul-02 at 19:30

            You get undefined error because you call the jsqr function before the onload callback where you define imageDataT. You need to wrap the code inside the callback.

            Source https://stackoverflow.com/questions/68222084


            undefined is not an object (evalution 'navigation.mediaDevices.getUserMedia')
            Asked 2020-Jul-14 at 11:50

            I want to open a camera scanner and below is code that working properly in android but in ios getting an error

            TypeError: undefined is not an object (evalution 'navigation.mediaDevices.getUserMedia')

            here is the full tutorial links https://devdactic.com/pwa-qr-scanner-ionic/ A small help is much appreciated



            Answered 2020-Jul-14 at 11:50

            getUserMedia is not available on WKWebView, which Capacitor uses. So you won't be able to use it unless Apple makes getUserMedia available in the future.

            Source https://stackoverflow.com/questions/62893456


            Schema validation failed with the following errors: Data path "" should have required property 'tsConfig'
            Asked 2020-Apr-01 at 14:27

            Recently i moved my angular application in some different folder. since then when i want to build the app i get this error:

            Schema validation failed with the following errors: Data path "" should have required property 'tsConfig'

            I tried to look up in github and stackoverflow and only found these links:


            they say i have to downgrade a package:

            "@angular-devkit/build-angular": "^0.800.1" to "^0.12.4"

            but this don't feel like the right way



            Answered 2020-Apr-01 at 14:27

            Check your angular.json file

            Maybe the tsconfig.json path is missing in the build configuration

            Source https://stackoverflow.com/questions/60950446


            jsQR Javascript mediadevices undefined
            Asked 2020-Jan-17 at 16:54

            I am trying to implement the jsQR javascript library from git: jsQR

            I am testing on Safari 13.0.4 and when i run their demo found on their webpage it runs with no problems.

            Now when i implement the same exact code (copy&paste) from the demo's inspector to my page i get the message TypeError: undefined is not an object (evaluating 'navigator.mediaDevices.getUserMedia') which after some console printing the actual undefined object is navigator.mediaDevices this is strange since their demo is working i do not think it is a browser issue.

            Additionally i run my page on firefox and it works perfectly fine.

            What might be the problem?

            Here is the code i have (it is the exact as demo anyway):




            Answered 2020-Jan-17 at 16:54

            Solved it. The development server is not secure and thus safari does not allow the use of WebRTC on insecure connections.

            To allow the use (on safari at least) you have to go to Develop>WebRTC>Allow media capture on insecure sites.

            Source https://stackoverflow.com/questions/59787401

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install jsQR

            You can download it from GitHub.


            jsQR is written using typescript. You can view the development source in the src directory. Tests can be run with. Besides unit tests the test suite contains several hundred images that can be found in the /tests/end-to-end/ folder. Not all the images can be read. In general changes should hope to increase the number of images that read. However due to the nature of computer vision some changes may cause images that pass to start to fail and visa versa. To update the expected outcomes run npm run-script generate-test-data. These outcomes can be evaluated in the context of a PR to determine if a change improves or harms the overall ability of the library to read QR codes. A summary of which are passing and failing can be found at /tests/end-to-end/report.json. After testing any changes, you can compile the production version by running. Pull requests are welcome! Please create seperate branches for seperate features/patches.
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          • npm

            npm i jsqr

          • CLONE
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          • CLI

            gh repo clone cozmo/jsQR

          • sshUrl


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