Overview

The CrypTagEncoder programs an NTAG424 DNA tag over a PC/SC reader. Every example assumes a connected tag and relies on auto-discovery and auto-authentication — see the connect-once model.

import { CrypTagEncoder } from 'cryptag';

const tag = new CrypTagEncoder();
await tag.connect();   // the one required step

• Connection & Lifecycle — connect, readers, disconnect, session reset, status checks.
• Discovery & Authentication — discover, authenticate, UID, TagTamper, key/signature checks.
• Reading — full read, NDEF, proprietary, CC, raw file, file settings, counter.
• Writing & Formatting — write NDEF/proprietary/CC, clear, factory reset, build NDEF.
• SDM Encoding — encodeTag (plain / encrypted / full) and disableSDM.
• Tag Configuration — file settings, LRP, random UID, TagTamper, brute-force limit.
• Key Management — current / target keys, diversification, change keys, export / import.

For result shapes, error codes, and the glossary, see Concepts. The encoder needs the nfc-pcsc native binding (npm install nfc-pcsc); the decoder needs none.