npm install wiegand-node

"use strict";

const Wiegand = require('wiegand-node');

var pinD0 = 4,  //DATA0 of Wiegand connects to RPi GPIO04 (Pin 7)
    pinD1 = 17; //DATA1 of Wiegand connects to RPi GPIO17 (Pin 11)

const w = new Wiegand({ d0: pinD0, d1: pinD1 });
w.begin();
w.on('reader', (idDec, idRFID, idHex) => {
  console.log(idDec); // RAW data
  
  console.log(idRFID); // EM format
  
  console.log(idHex); // Mifare format

});

const w = new Wiegand(
    { 
        d0: int, // the number of your GPIO PIN. This means eg. "4" for "GPIO04", not 7 from "Pin 7" | default 4
        d1: int  // the number of your GPIO PIN. This means eg. "17" for "GPIO17", not 11 from "Pin 11" | default 11
        debug: bool // enable debug console output | default false 
    }
);

w.on('reader', (idDec, idRFID, idHex) => {
    // stuff
});
w.on('reader_failed_parity', (data) => {
    // stuff
});