NdefJS

Library for creating and parsing NDEF messages.

Installing

Bower

bower install ndef

NPM

npm install @taptrack/ndef

Creating Records

Text records

var ndef = require('@taptrack/ndef');

// language code is optional, defaults to 'en'
var textRecord = ndef.Utils.createTextRecord("sirop","fr"); 
var message = new ndef.Message([textRecord]);

// Uint8Array for storing, writing to a tag, etc.
var bytes = message.toByteArray(); 

URI records

// NDEF uri prefixes will be automatically applied
var uriRecord = ndef.Utils.createUriRecord("http://www.google.com"); 
var message = new ndef.Message([uriRecord]);

// Uint8Array for storing, writing to a tag, etc.
var bytes = message.toByteArray(); 

Custom records

// creating message to be carried inside smartposter record
var uri = ndef.Utils.createUriRecord("http://www.google.com");
var payloadMsg = new ndef.Message([uri]);

var chunked = false; // non-chunked record
var tnf = new Uint8Array([0x01]); // TNF well known
var type = new Uint8Array([0x53,0x70]);
var payload = payloadMessage.toByteArray();

var spRecord = new ndef.Record(chunked, tnf, type, id, payload);
var spMessage = new ndef.Message([record]);

// Uint8Array for storing, writing to a tag, etc.
var bytes = spMessage.toByteArray();

Parsing messages

Text records

var message = ndef.Message.fromBytes(byteArray);
var records = message.getRecords();

var recordContents = ndef.Utils.resolveTextRecord(parsedRecords[0]);
console.log("Language: " + recordContents.language);
console.log("Content: " + recordContents.content);

URI records

var message = ndef.Message.fromBytes(byteArray);
var parsedRecords = message.getRecords();

var uri = ndef.Utils.resolveUriRecordToString(parsedRecords[0]);
console.log("URI: " + uri);

Other records

// takes a Uint8Array containing a valid, complete message
var message = ndef.Message.fromBytes(byteArray);

// array of all the records
var records = message.getRecords();

for(var i = 0; i < records.length; i++) {
    var record = records[i];
    console.log("Chunked: " + (record.isChunked ? "Yes" : "No"));
    console.log("TNF: " + record.getTnf().toString());
    console.log("Type: " + record.getType().toString());
    console.log("ID: " + record.getId().toString());
    console.log("Payload: " + record.getPayload().toString());
}