How to use back camera instead of the front camera?

Question

I have a QR scanning camera, but when I open my website on a cell phone, the face camera turns on in my website. I want to use the back camera.

function set         


        

Answer 1

If you want to force the device to use front camera you can add facingMode in constraints:

var constraints = { 
  audio: true,
  video: {
    facingMode: 'environment'
};

or use exact:

facingMode: { exact: 'environment' }