react-native-nfc-manager

Bring NFC feature to React Native. Inspired by phonegap-nfc and react-native-ble-manager

Contributions are welcome!

We also have a slack channel, you're welcome to chat with us for any issue or idea! join us here

Install

javascript part

npm i --save react-native-nfc-manager

native part

This library use native-modules, so you will need to do pod install for iOS:

cd ios && pod install && cd ..

For Android, it should be properly auto-linked, so you don't need to do anything.

Setup

Please see here

Demo App

Please see this project: React Native NFC ReWriter App

Latest Changes

v2 to v3 is primarily a refactor, to let long-term maintain easier. During the refactor, there're also several major enhancements:

• Separate each NFC technology into its own handler, and provide getter from main NfcManager object to access them. This way we can avoid namespace corrupting due to individual tech methods.
• Provide compatibility layer for common NFC tech handler, such as NfcA or IsoDep, so we don't need to do lots of if/else according to Platform.OS.

Basic Usage

If all you want to do is to read NDEF data, you can use this example:

import NfcManager, {NfcEvents} from 'react-native-nfc-manager';

// Pre-step, call this before any NFC operations
async function initNfc() {
  await NfcManager.start();
}

function readNdef() {
  const cleanUp = () => {
    NfcManager.setEventListener(NfcEvents.DiscoverTag, null);
    NfcManager.setEventListener(NfcEvents.SessionClosed, null);
  };

  return new Promise((resolve) => {
    let tagFound = null;

    NfcManager.setEventListener(NfcEvents.DiscoverTag, (tag) => {
      tagFound = tag;
      resolve(tagFound);
      NfcManager.setAlertMessageIOS('NDEF tag found');
      NfcManager.unregisterTagEvent().catch(() => 0);
    });

    NfcManager.setEventListener(NfcEvents.SessionClosed, () => {
      cleanUp();
      if (!tagFound) {
        resolve();
      }
    });

    NfcManager.registerTagEvent();
  });
}

Anything else, ex: write NDEF, send custom command, please read next section.

Advanced Usage

In high level, there're 3 steps to perform advanced NFC operations:

1. request your specific NFC technology
2. select the proper NFC technology handler, which is implemented as getter in main NfcManager object, including:
   • ndefHandler
   • nfcAHandler
   • isoDepHandler
   • iso15693HandlerIOS
   • mifareClassicHandlerAndroid
   • mifareUltralightHandlerAndroid
3. call specific methods on the NFC technology handler
4. clean up your tech registration

For example, here's an example to write NDEF:

import NfcManager, {NfcTech, Ndef} from 'react-native-nfc-manager';

// Pre-step, call this before any NFC operations
async function initNfc() {
  await NfcManager.start();
}

async function writeNdef({type, value}) {
  let result = false;

  try {
    // Step 1
    await NfcManager.requestTechnology(NfcTech.Ndef, {
      alertMessage: 'Ready to write some NDEF',
    });

    const bytes = Ndef.encodeMessage([Ndef.textRecord('Hello NFC')]);

    if (bytes) {
      await NfcManager.ndefHandler // Step2
        .writeNdefMessage(bytes); // Step3

      if (Platform.OS === 'ios') {
        await NfcManager.setAlertMessageIOS('Successfully write NDEF');
      }
    }

    result = true;
  } catch (ex) {
    console.warn(ex);
  }

  // Step 4
  NfcManager.cancelTechnologyRequest().catch(() => 0);
  return result;
}

To see more examples, please see React Native NFC ReWriter App

API

Please see here

FAQ

Please see here

Legacy (v1, v2) docs

Please see v2 branch