BarcodeDetector
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The BarcodeDetector
interface of the Barcode Detection API
allows detection of linear and two dimensional barcodes in images.
Constructors
BarcodeDetector.BarcodeDetector()
Experimental-
Creates and returns a
BarcodeDetector
object, with optionalbarcodeDetectorOptions
Static methods
getSupportedFormats()
Experimental-
Returns a
Promise
which fulfills with anArray
of supported barcode format types.
Instance methods
detect()
Experimental-
Returns a
Promise
which fulfills with an array ofdetectedBarcode
objects with the following properties:boundingBox
: ADOMRectReadOnly
, which returns the dimensions of a rectangle representing the extent of a detected barcode, aligned with the image.cornerPoints
: The x and y co-ordinates of the four corner points of the detected barcode relative to the image, starting with the top left and working clockwise. This may not be square due to perspective distortions within the image.format
: The detected barcode format. (For a full list of formats see the [landing page])rawValue
: A string decoded from the barcode data.
Examples
Creating A Detector
This example creates a new barcode detector object, with specified supported formats and tests for browser compatibility.
js
// create new detector
const barcodeDetector = new BarcodeDetector({
formats: ["code_39", "codabar", "ean_13"],
});
// check compatibility
if (barcodeDetector) {
console.log("Barcode Detector supported!");
} else {
console.log("Barcode Detector is not supported by this browser.");
}
Getting Supported Formats
The following example calls the getSupportFormat()
static method and logs the results to the console.
js
// check supported types
BarcodeDetector.getSupportedFormats().then((supportedFormats) => {
supportedFormats.forEach((format) => console.log(format));
});
Detect Barcodes
This example uses the detect()
method to detect the barcodes within the given image. These are iterated over and the barcode data is logged to the console.
js
barcodeDetector
.detect(imageEl)
.then((barcodes) => {
barcodes.forEach((barcode) => console.log(barcode.rawValue));
})
.catch((err) => {
console.log(err);
});
Specifications
Specification |
---|
Accelerated Shape Detection in Images # barcode-detection-api |
Browser compatibility
BCD tables only load in the browser