access camera and read qr code using javascript

Publicado el: 16 julio 2024
en el canal de: CodeMore

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to access the camera and read qr codes using javascript, we can utilize the `getusermedia` api to access the camera stream and a javascript library called `jsqr` to decode the qr code from the video feed.

here is a step-by-step tutorial to achieve this:

step 1: request camera access
first, we need to request the user's permission to access their camera. we can do this using the `getusermedia` api.

step 2: create video element
next, we'll create a video element in the html to display the camera feed.

step 3: display camera feed
now, we need to attach the camera stream to the video element to display the camera feed.

step 4: read qr code
we will use the `jsqr` library to read the qr code from the camera feed. you can include the library in your project using a cdn link or by downloading the library.

step 5: decode qr code
we will capture frames from the video feed, convert them to an image, and then use `jsqr` to decode the qr code.

full example
here is a full example combining all the steps:

this example will continuously scan for qr codes in the camera feed and log the decoded data to the console when a qr code is detected.

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