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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/NDEFReadingEvent/serialNumber below:

NDEFReadingEvent: serialNumber property - Web APIs

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The serialNumber property of the NDEFReadingEvent interface returns the serial number of the device, which is used for anti-collision and identification, or an empty string if no serial number is available.

A string containing the device's serial number.

This example shows how to create a convenience function that reads a single tag and then stops polling, saving battery life by cutting unneeded work. The example could easily be extended to time out after a given amount of milliseconds.

const ndefReader = new NDEFReader();

function read() {
  return new Promise((resolve, reject) => {
    const controller = new AbortController();
    controller.signal.onabort = reject;
    ndefReader.addEventListener(
      "reading",
      (event) => {
        controller.abort();
        resolve(event);
      },
      { once: true },
    );
    ndefReader.scan({ signal: controller.signal }).catch((err) => reject(err));
  });
}

read().then(({ serialNumber }) => {
  console.log(serialNumber);
});

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