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Check the Browser compatibility table carefully before using this in production.

The scan() method of the NDEFReader interface activates a reading device and returns a Promise that either resolves when an NFC tag is read or rejects if a hardware or permission error is encountered. This method triggers a permission prompt if the "nfc" permission has not been previously granted.


var readerPromise = NDEFReader.scan(options);


options Optional

An object with the following properties:

  • signal -- An AbortSignal that allows cancelling this scan() operation.

Return value

A Promise that resolves immediately after scheduling read operations for the NFC adapter.


This method doesn't throw exceptions; instead, it rejects the returned promise, passing a DOMException whose name is one of the following:


The scan operation was aborted with the AbortSignal passed in the options argument.


There's already an ongoing scan.


The permission for this operation was rejected.


There is no NFC adapter compatible with Web NFC, or a connection can not be established.


Handle scanning errors

This example shows what happens when a scan promise rejects and readingerror is thrown.

const ndef = new NDEFReader();
ndef.scan().then(() => {
  console.log("Scan started successfully.");
  ndef.onreadingerror = (event) => {
    console.log("Error! Cannot read data from the NFC tag. Try a different one?");
  ndef.onreading = (event) => {
    console.log("NDEF message read.");
}).catch(error => {
  console.log(`Error! Scan failed to start: ${error}.`);


# dom-ndefreader-scan

Browser compatibility

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