OTP verification 2 minutes count down timer

Java Script

 let timerOn = true;

function timer(remaining) {

  var m = Math.floor(remaining / 60);

  var s = remaining % 60;

  m = m < 10 ? '0' + m : m;

  s = s < 10 ? '0' + s : s;

  document.getElementById('timer').innerHTML = m + ':' + s;

  remaining -= 1;

  if(remaining >= 0 && timerOn) {

    setTimeout(function() {

        timer(remaining);

    }, 1000);

    return;

  }

  if(!timerOn) {

    // Do validate stuff here

    return;

  }

  // Do timeout stuff here

  alert('Timeout for otp');

}

// Then Call the function of Timer //

timer(120);

HTML

<input type="text" name="otp" placeholer="Enter your otp"/>

<div>Time left = <span id="timer"></span></div>