NDEFReadingEvent.serialNumber

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 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.

Value

A string containing the device's serial number.

Examples

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 ctlr = new AbortController();
      ctlr.signal.onabort = reject;
      ndefReader.addEventListener("reading", event => {
        ctlr.abort();
        resolve(event);
      }, { once: true });
      ndefReader.scan({ signal: ctlr.signal }).catch(err => reject(err));
    });
  }

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

Specifications

Specification
Web NFC API
# dom-ndefreadingevent-serialnumber

Browser compatibility

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