JSFiddle - React, Tailwind, and code Playground

JavaScript

freq = 606 / 44100;
zeros = [ 1.1311308700603495, -1.9742954081351101, 0.8512071363732295 ];
poles = [ 1.0, -1.9742954081351101, 0.9823380064335793 ];

function evalCoefs(coefs, freq) {
  var len = coefs.length;
  var res = 0;
  for (var idx = 0; idx < len; idx++)
    res += coefs[idx] * Math.exp(-idx * freq * 2 * Math.PI);
  return res
}

var resZeros = evalCoefs(zeros, freq);
var resPoles = evalCoefs(poles, freq);

var amp = Math.abs(resZeros/resPoles);
var ampDb = 20 * Math.log10(amp);
alert(ampDb);