DOMException: Requested device not found

Here is the code I have used in my react component.

import Quagga from 'quagga'

  componentDidMount() {
    Quagga.init({           
      inputStream : {
          name : "Live",
          type : "LiveStream",
          target: document.querySelector('#barcode-scanner'), 
           constraints: {
              width: 520,
              height: 400,                  
              facingMode: "user"  //"environment" for back camera, "user" front camera
              }               
      },                         
      decoder : {
          readers : ["code_128_reader","code_39_reader"]
      }

  }, function(err) {
      if (err) {
        console.log(err)
        return
      }
      Quagga.start()
      Quagga.onDetected(function(result) {                              
        var last_code = result.codeResult.code;                   
        console.log("last_code "); 
     })
    })
  }

Which gives me following error

DOMException: Requested device not found

Please help!!!

[NickPea]

Had the same issue.

Simply restarted my laptop and now it works again.

[ericblade]

It’s telling you you don’t have a device that fits the constraints that you’ve given, width, height, and/or facingMode.

What device/browser/camera?