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@tauzen tauzen/app.js
Last active Aug 29, 2015

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FirefoxOS tag writing example, requires NFC capable device running FirefoxOS 2.1. App needs to be certified! Privileged APIs comming soon!
window.addEventListener('DOMContentLoaded', function() {
'use strict';
console.log('DOMContentLoaded, checking for NFC');
if (!navigator.mozNfc) {
console.log('NFC not available');
navigator.mozSetMessageHandler('activity', (activity) => {
var data =;
// prepare NDEF record to write using NfcUtils from shared/js/nfc_utils.js
var nfcUtils = new NfcUtils();
var type = NDEF.RTD_URI;
var url = nfcUtils.fromUTF8('\');
var record = new MozNDEFRecord({tnf:tnf, type:type, payload:url});
// getting the tag
var tag = navigator.mozNfc.getNFCTag(data.sessionToken);
// writing array of NDEF records (NDEF message) to the tag
var request = tag.writeNDEF([record]);
request.onsuccess = () => {
console.log('wrote data to tag');
request.onerror = () => {
console.log('failed to write data to tag');
return true;
<!DOCTYPE html>
<meta charset="utf-8">
<title>Tag Write</title>
<meta name="viewport" content="width=device-width">
<script type="text/javascript" src="shared/js/nfc_utils.js" defer></script>
<script type="text/javascript" src="js/app.js" defer></script>
"version": "0.1.0",
"name": "Tag write",
"description": "Quick example of writing contents on tag",
"launch_path": "/index.html",
"type": "certified",
"permissions": {
"nfc": { "access": "readwrite" }
"activities": {
"nfc-ndef-discovered": {
"filters": {
"type": "empty"
"default_locale": "en"
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