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Having issue resetting JS stopwatch

I made a little typing game that reveals some random text and you have to type the same in, so that you can test your typing speed. the users has the ability to play again and again, the issue is that when the user types play again, the stopwatch does not begin as it did the first time.
Can anyone help me with making the stopwatch restart everytime the user clicks on the play again button?
[ full code is here] (https://jsfiddle.net/kisho/ncbxd9o4/#&togetherjs=qD5bT8vLiw)
js portion-
const textDisplay = document.querySelector('#text-display');
const input = document.querySelector('#input');
const btn = document.querySelector('#btn');
const textBox = document.querySelector('#text-box');
const countdown = document.querySelector('#countdown');
const stopwatch = document.querySelector('#stopwatch');
const successMessege = document.querySelector('#success-messege');
const stopwatchTime = document.querySelector('#stopwatch-time');
btn.addEventListener('click', runGame);
function runGame() {
if ((btn.innerText = 'Play again')) {
playAgain();
fetchQuote();
countownTimer();
confirmQuote();
} else {
fetchQuote();
countownTimer();
confirmQuote();
}
}
function fetchQuote() {
fetch('https://api.quotable.io/random')
.then((res) => {
return res.json();
})
.then((data) => {
textDisplay.innerText = data.content;
});
}
function countownTimer() {
if (timer !== undefined) {
clearInterval(timer);
}
var timeleft = 2;
var downloadTimer = setInterval(function() {
if (timeleft <= 0) {
clearInterval(downloadTimer);
document.getElementById('countdown').innerHTML = 'Start Typing!';
input.classList.remove('displayNone');
runningStopwatch.classList.remove('displayNone');
begin();
} else {
document.getElementById('countdown').innerHTML = timeleft + ' seconds remaining';
}
timeleft -= 1;
}, 1000);
}
function confirmQuote() {
if ((countdown.innerHTML = 'Start typing!')) {
input.addEventListener('keyup', function(event) {
if (event.keyCode === 13) {
if (textDisplay.innerText === input.value) {
btn.innerText = 'Play again';
// textBox.classList.add('displayNone');
hold();
} else successMessege.innerText = 'Missed something there, try again!!';
}
});
}
}
function playAgain() {
textBox.classList.remove('displayNone');
input.classList.add('displayNone');
input;
input.value = '';
successMessege.innerText = '';
}
let ms = 0,
s = 0,
m = 0;
let timer;
let runningStopwatch = document.querySelector('.running-stopwatch');
function begin() {
timer = setInterval(run, 10);
}
function run() {
runningStopwatch.textContent =
(m < 10 ? '0' + m : m) + ': ' + (s < 10 ? '0' + s : s) + ': ' + (ms < 10 ? '0' + ms : ms);
ms++;
if (ms == 100) {
ms = 0;
s++;
}
if (s == 60) {
s = 0;
m++;
}
}
function hold() {
clearInterval(timer);
successMessege.innerText = `Nice job! You just typed in x seconds!`;
}
function stop() {
(ms = 0), (s = 0), (m = 0);
runningStopwatch.textContent =
(m < 10 ? '0' + m : m) + ': ' + (s < 10 ? '0' + s : s) + ': ' + (ms < 10 ? '0' + ms : ms);
}

You are not handling the clearInterval correctly.
You are clearing the interval only if one ends the game successfully.
My solution would be:
When calling the countownTimer() function, the first thing you should do, is to check if the interval timer is still running.
function countownTimer() {
if (timer !== undefined) {
clearInterval(timer);
}
// [...]
}
The next thing would be, to start the interval every time begin() gets called.
function begin() {
timer = setInterval(run, 10);
}

How to change it to show minutes instead of seconds?

How can I change my display so instead of calculating seconds it calculates the minutes because when I tried to do the remminuts it did not work and im not quite sure where i am going wrong.
Here is the code for the javascript:
const container = document.querySelector('.counter');
const buttonsDiv = document.querySelector('.buttons');
const secInput = document.getElementById('seconds');
var seconds;
var remseconds;
var minuts;
var toCount = false;
function toSubmit(){
display('start');
remove('seconds');
remove('ok');
seconds = Number(secInput.value);
counting();
}
function display(e){
document.getElementById(e).style.display = 'block';
}
function remove(e){
document.getElementById(e).style.display = 'none';
}
function check(stat){
if(stat.id == "start"){
display("stop");
remove("start");
toCount = true;
}
else if(stat.id == "stop"){
display("continue");
remove("stop");
toCount = false
}
else{
display("stop");
remove("continue");
toCount =true;
}
}
function count(){
if(seconds > 0){
if(toCount == true){
seconds--;
remseconds = seconds % 60;
minuts = Math.floor(seconds / 60);
if(minuts < 10){
minuts = "0" + minuts;
}
if(remseconds < 10){
remseconds = "0" + remseconds;
}
container.innerHTML = minuts + " : " + remseconds;
}
}
else{
container.innerHTML = "DONE!";
buttonsDiv.style.opacity = "0";
}
}
function counting(){
remseconds = seconds % 60;
minuts = Math.floor(seconds / 60);
if(remseconds < 10){
remseconds = "0" + remseconds;
}
container.innerHTML = minuts + " : " + remseconds;
setInterval(count, 1000);
}
As you can see it's calculating for the seconds, but when I tried minutes instead, I got no results from it so i am very stuck on what i might be doing wrong.

If you don't really care about accuracy you can use a function like this:
const secs = x => Math.round(x/60)
This however calculates 0 (mins) when you enter 29 (seconds). If you don't like that search for a more sophisticated solution online.

Paused a requestAnimationFrame when click on a button

Is it possible to pause a requestAnimationFrame?
When i click on a specific button, the animation has to be paused.
And by click the button another time the animation has to be continued.
public addProgressbar() {
const progressbar = $('.progressbar__value');
const max = this.$progressMax;
const time = (1000 / max) * 5;
let start = null;
this.progress = 0;
const step = timestamp => {
if (start === null) {
start = timestamp;
}
this.progress = timestamp - start;
progressbar[0].style.width = Math.min(this.progress / 50, 2000).toFixed() + '%';
if (this.progress < 5000) {
requestAnimationFrame(step);
}
};
setTimeout(() => {
window.requestAnimationFrame(step);
}, 1000);
}

Javascript Pomodoro Clock - clearInterval not working when timer is 0

I am making a simple podomoro clock, and everything seems to work fine except when timer reaches 0 its doesn't entirely stop. Minutes seem to stop but seconds keep decrementing. I think there might be something wrong with my startTimer function but I've tried tinkering with it for hours to no result.
JS:
$(document).ready(function() {
var pomoTime = $('#pomodoroNum');
var breakTime = $('#breakNum');
var status = $('#timerStatus');
var timerDisplay = $('#timer');
var startButton = $('#startBtn');
var stopButton = $('#stopBtn');
var state = 1; // 1=stopped 2=running
var countDown; // intervalID;
var minutes = 0;
var seconds = 60;
startButton.click(function() {
if (state == 1) { // if timer is not running then start timer
startTimer(minutes, seconds);
$('#breakMinus').off("click");
$('#breakPlus').off("click");
$('#workMinus').off("click");
$('#workPlus').off("click"); // disable +- controls when timer starts
};
});
updateDisplay(); // initially controls are enabled at the start
stopButton.on("click", function() {
if (state == 2) {
pauseTimer();
state = 1;
updateDisplay(); // renable +- controls when timer stops
}
});
function startTimer(m, s) {
state = 2;
var startMinutes = m;
var startSeconds = s;
countDown = setInterval(function() {
startSeconds--;
startMinutes = ("0" + startMinutes).slice(-2); // double digits conversion if <10
startSeconds = ("0" + startSeconds).slice(-2);
minutes = ("0" + startMinutes).slice(-2); // update minutes and seconds so when timer is stopped, it can resume from where it left off when startButton is pressed.
seconds = ("0" + startSeconds).slice(-2);
timerDisplay.html(startMinutes + ":" + startSeconds);
if (startSeconds == 0 && startMinutes > 0) {
startMinutes-- // decerement minutes when seconds 0...
startSeconds = 60; // ..and reset seconds to 60
}
}, 1000);
if (startMinutes == 0 && startSeconds == 0) {
clearInterval(countDown);// <-- not clearing here
}
};
function pauseTimer() {
clearInterval(countDown);
};
function updateDisplay() {
// break +-
$('#breakMinus').on("click", function() {
status.html("Break");
if (breakTime.text() > 1) {
breakTime.text(+breakTime.text() - 1);
};
timerDisplay.text(breakTime.text());
});
$('#breakPlus').on("click", function() {
status.html("Break");
breakTime.text(+breakTime.text() + 1); // parseInt to covert string into number so it doesn't concatanate.
timerDisplay.text(breakTime.text());
});
// work +-
$('#workMinus').on("click", function() {
status.html("Work");
if (pomoTime.text() > 1) {
minutes = pomoTime.text() - 2;
}
seconds = 60;
if (pomoTime.text() > 1) {
pomoTime.text(+pomoTime.text() - 1);
};
timerDisplay.text(pomoTime.text());
});
$('#workPlus').on("click", function() {
minutes = pomoTime.text();
seconds = 60;
status.html("Work");
pomoTime.text(+pomoTime.text() + 1); // parseInt to covert string into number to prevent concatanation.
timerDisplay.html(pomoTime.html());
});
};
});
example: http://codepen.io/aliz16/pen/OXMwRJ

Your check for the stop condition is outside of your interval function. That's why it's never stopping. Move the condition inside the function and use <= to be extra safe:
if (startSeconds <= 0 && startMinutes > 0) {
startMinutes -= 1; // decerement minutes when seconds 0...
startSeconds += 60; // ..and reset seconds to 60
}
if (startMinutes <= 0 && startSeconds <= 0) {
clearInterval(countDown);
}
}, 1000);

JS Timer, clearInterval() doesn't clear the timer. When restart, it resumes instead of restarting at zero

Well the title already says it. I am working on a timer, but when I let it run for around 10 secs, press space (space = keycode 13), then it stops and then if I press space again to start, it resumes but then +2 secondes. (started at e.g. 18 sec and resumes from 20 sec) which comes from the clearInterval ID it return I think... not sure.
If you guys could help me out, that'd be great.
If you have any suggesstions to do things differently, let me know too!
I'm open for all the feedback I get and improvement / tips on my code! :)
Javascript
var Timer = function() {
var self = this,
div = document.querySelector('.timer'),
hours, minutes, seconds, millsecs;
this.oldDate = new Date().getTime();
this.newDate;
this.isRunning = false;
this.time;
this.timerId = 0;
this.start = function() {
self.isRunning = true;
if (self.isRunning) {
self.timerId = setInterval(function() {
self.time = new Date().getTime() - self.oldDate;
self.time = self.time.toString();
millsecs= self.time.substr(-3);
seconds = (Math.floor(self.time / 1000) % 60) + '.';
minutes = (self.time >= 60000) ? (Math.floor(self.time / (1000*60)) % 60) + ':' : '';
hours = (self.time >= 86400) ? (Math.floor(self.time / (1000*60*60)) % 24) + ':' : '';
div.innerHTML = hours + minutes + seconds + millsecs;
}, 10);
}
}
this.stop = function() {
self.isRunning = false;
clearInterval(obj.timerId);
self.timerId = 0;
}
};
var obj = new Timer();
window.addEventListener('keyup', function(e) {
if(e.keyCode == 32 && obj.isRunning == false) {
obj.start();
}
else if (e.keyCode == 32 && obj.isRunning == true) {
obj.stop();
}
});