How to Make a Pomodoro Timer in JS? (Step-by-Step Guide)

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Introduction: Boost Productivity with JavaScript

Struggling to stay focused while working or studying? You’re not alone. The Pomodoro Technique is a scientifically backed time-management method that breaks your work into focused intervals—typically 25 minutes of work followed by a 5-minute break. In this tutorial, you’ll learn how to make a Pomodoro timer in JavaScript from scratch.

Whether you’re a beginner in web development or just want a fun coding project, this guide is perfect for you.

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What is the Default Timer for Pomodoro?

The original Pomodoro Technique, developed by Francesco Cirillo, recommends:

• 25 minutes of focused work
• 5 minutes of short break
• After four Pomodoros, take a 15-30 minute long break

This cycle keeps your brain fresh and improves productivity.

JavaScript Timer: What You Need to Know

To create a JavaScript countdown timer, we use functions like setInterval(), which repeatedly executes code every few milliseconds. This lets us track the passing of seconds and update the timer display dynamically.

Core Concepts Involved:

• setInterval()
• DOM manipulation (document.querySelector, etc.)
• clearInterval() to stop timers
• HTML5 and CSS3 basics for layout and design

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How to Create a Timer Using JavaScript?

Here’s a simple example of a 60-second countdown timer:

<p id="timer">60</p>
<script>
let timeLeft = 60;
let timer = setInterval(() => {
    if (timeLeft <= 0) {
        clearInterval(timer);
        document.getElementById("timer").innerHTML = "Time's up!";
    } else {
        document.getElementById("timer").innerHTML = timeLeft + " seconds left";
        timeLeft--;
    }
}, 1000);
</script>

This is the foundation for any Pomodoro-style timer.

How to Build a Pomodoro Timer?

Let’s create a fully functional Pomodoro timer using HTML, CSS, and JavaScript.

Step 1: HTML Structure

<div class="pomodoro">
  <h1>Pomodoro Timer</h1>
  <div id="timer">25:00</div>
  <button onclick="startTimer()">Start</button>
  <button onclick="resetTimer()">Reset</button>
</div>

Step 2: CSS Styling

.pomodoro {
  text-align: center;
  margin-top: 100px;
  font-family: Arial;
}
#timer {
  font-size: 48px;
  margin: 20px;
}

Step 3: JavaScript Logic

let timer;
let minutes = 25;
let seconds = 0;
let isRunning = false;

function updateDisplay() {
  const display = document.getElementById("timer");
  let min = minutes < 10 ? "0" + minutes : minutes;
  let sec = seconds < 10 ? "0" + seconds : seconds;
  display.textContent = `${min}:${sec}`;
}

function startTimer() {
  if (isRunning) return;
  isRunning = true;
  timer = setInterval(() => {
    if (seconds === 0) {
      if (minutes === 0) {
        clearInterval(timer);
        isRunning = false;
        alert("Pomodoro Completed!");
        return;
      }
      minutes--;
      seconds = 59;
    } else {
      seconds--;
    }
    updateDisplay();
  }, 1000);
}

function resetTimer() {
  clearInterval(timer);
  isRunning = false;
  minutes = 25;
  seconds = 0;
  updateDisplay();
}

document.addEventListener("DOMContentLoaded", updateDisplay);

Make Your Own Pomodoro Timer

You can host this on GitHub Pages or deploy it using services like Netlify or Vercel. Here’s a simple repository to get you started:

Pomodoro Timer Using JavaScript GitHub:

• https://github.com/yourusername/js-pomodoro-timer (replace with your own)

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Circular Countdown Timer JavaScript

Want to go beyond the basics? Add a circular visual countdown using Canvas API or SVG.

✅ Features:

• Custom duration (e.g. 60 seconds or 5 minutes)
• Circular progress animation using SVG
• Visual + numeric countdown
• Easily customizable

📁 1. HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Circular Countdown Timer</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="timer-container">
    <svg class="progress-ring" width="200" height="200">
      <circle class="progress-ring__circle" stroke="tomato" stroke-width="8" fill="transparent" r="90" cx="100" cy="100"/>
    </svg>
    <div class="timer-text" id="timer-text">60</div>
  </div>

  <script src="script.js"></script>
</body>
</html>

🎨 2. CSS (style.css)

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #111;
  font-family: Arial, sans-serif;
}

.timer-container {
  position: relative;
  width: 200px;
  height: 200px;
}

.timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 2.5em;
}

.progress-ring__circle {
  transition: stroke-dashoffset 1s linear;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

⚙️ 3. JavaScript (script.js)

const FULL_DASH_ARRAY = 2 * Math.PI * 90; // circumference of the circle (r=90)
const timerText = document.getElementById("timer-text");
const circle = document.querySelector(".progress-ring__circle");

circle.setAttribute("stroke-dasharray", FULL_DASH_ARRAY);
let timeLeft = 60; // seconds
let totalTime = timeLeft;

function setCircleProgress(time) {
  const offset = FULL_DASH_ARRAY * (1 - time / totalTime);
  circle.setAttribute("stroke-dashoffset", offset);
  timerText.textContent = time;
}

setCircleProgress(timeLeft);

const countdown = setInterval(() => {
  timeLeft--;
  setCircleProgress(timeLeft);

  if (timeLeft <= 0) {
    clearInterval(countdown);
    timerText.textContent = "Done!";
  }
}, 1000);

🧪 Try customizing:

• Change timeLeft = 300 for a 5-minute Pomodoro
• Modify the circle stroke, color, or radius
• Add a start/reset button for more interactivity

How to Create a 5 Minute Countdown Timer in JavaScript?

Just change the timer’s initial value:

let minutes = 5;
let seconds = 0;

This allows you to create shorter sprints or quick breaks between work sessions.

How to Make a 60 Second Timer in JavaScript?

Same idea, but only one minute:

let minutes = 0;
let seconds = 60;

How to Make a Pomodoro Timer Video

Looking for a video tutorial? Check out these YouTube tutorials:

• Build a Pomodoro Timer in JavaScript (freeCodeCamp)
• Pomodoro Timer JS Tutorial

Great! Let’s walk through how to make a Pomodoro Timer with JavaScript, and I’ll also guide you on how to turn that into a video, perfect for sharing on YouTube, TikTok, or your portfolio.

🎥 How to Make a Pomodoro Timer Video (with JavaScript)

📌 What You’ll Learn:

• ✅ How to build a Pomodoro Timer using HTML, CSS, and JavaScript
• ✅ How to style it to look modern and minimal
• ✅ How to record your screen and turn it into a video tutorial
• ✅ Where to publish and how to share

🧠 What is a Pomodoro Timer?

A Pomodoro Timer breaks work into focused intervals (typically 25 minutes) followed by a 5-minute break. It boosts productivity and reduces burnout.

⏱ Default Pomodoro Intervals:

• Work: 25 minutes
• Short Break: 5 minutes
• Long Break: 15 minutes (after 4 sessions)

💻 Step 1: Build the Pomodoro Timer in JavaScript

Here’s a basic version of the Pomodoro Timer with HTML, CSS, and JavaScript:

🧱 HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Pomodoro Timer</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="container">
    <h1>Pomodoro Timer</h1>
    <div class="timer" id="timer">25:00</div>
    <div class="buttons">
      <button id="start">Start</button>
      <button id="pause">Pause</button>
      <button id="reset">Reset</button>
    </div>
  </div>

  <script src="script.js"></script>
</body>
</html>

🎨 CSS

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #282c34;
  color: white;
  font-family: Arial, sans-serif;
  flex-direction: column;
}

.container {
  text-align: center;
}

.timer {
  font-size: 5rem;
  margin: 20px 0;
}

.buttons button {
  margin: 5px;
  padding: 10px 20px;
  font-size: 1.2rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

⚙️ JavaScript

let time = 25 * 60;
let timerInterval = null;
let isRunning = false;

const timerDisplay = document.getElementById("timer");
const startBtn = document.getElementById("start");
const pauseBtn = document.getElementById("pause");
const resetBtn = document.getElementById("reset");

function updateDisplay() {
  const minutes = Math.floor(time / 60);
  const seconds = time % 60;
  timerDisplay.textContent = `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
}

function startTimer() {
  if (isRunning) return;
  isRunning = true;
  timerInterval = setInterval(() => {
    if (time > 0) {
      time--;
      updateDisplay();
    } else {
      clearInterval(timerInterval);
      isRunning = false;
      alert("Time's up! Take a break.");
    }
  }, 1000);
}

function pauseTimer() {
  clearInterval(timerInterval);
  isRunning = false;
}

function resetTimer() {
  clearInterval(timerInterval);
  time = 25 * 60;
  updateDisplay();
  isRunning = false;
}

startBtn.onclick = startTimer;
pauseBtn.onclick = pauseTimer;
resetBtn.onclick = resetTimer;

updateDisplay();

📽️ Step 2: Record Your Pomodoro Timer as a Video

🛠 Tools You Can Use:

• OBS Studio (Free) – Record or livestream your development process.
• Loom – Screen record with voiceover.
• Camtasia / ScreenFlow – More editing control.

🎙️ Tips for Recording:

• Explain what each line of code does as you write.
• Use voiceover to keep the viewer engaged.
• Highlight productivity benefits.
• Zoom in on key parts (timer, buttons).

📤 Step 3: Share Your Video

Platforms:

• YouTube Shorts or full-length videos
• TikTok (great for fast tips)
• Instagram Reels
• LinkedIn (show your projects to recruiters!)

📌 Optimize for SEO:

• Title: “Build a Pomodoro Timer in JavaScript (Quick Tutorial)”
• Tags: JavaScript, Pomodoro, timer, productivity, webdev
• Thumbnail: Show timer + coding text
• Description: Include your GitHub repo and blog link

✅ Summary

Making a Pomodoro Timer with JavaScript is a great way to practice:

• DOM Manipulation
• Timers (setInterval)
• Event Listeners

And recording it as a video helps:

• Improve your teaching skills
• Build your dev portfolio
• Reach other learners

🧩 Bonus Challenge

🔥 Coding Challenge
Create a version with customizable time intervals and audio alerts!

How to Use This Pomodoro Timer for Free

You can embed the code directly in your personal site or turn it into a browser extension. It’s completely free and open-source.

Interactive Coding Challenge 🚀

Challenge: Modify the timer to support multiple Pomodoro rounds with long breaks after every 4 sessions.

// Bonus: Add session counter and long break logic

Bonus Points: Add sound alerts and break notifications!

Conclusion: Build Your Own Productivity Tool Today

Creating your own Pomodoro timer in JavaScript is an excellent way to improve both your coding skills and focus. This simple yet powerful project helps you understand timers, DOM manipulation, and event handling in JavaScript.

What’s Next?

• Try building a to-do list with Pomodoro integration
• Deploy your app on GitHub or DigitalOcean
• Share your project and inspire others!

You can also see

• Pomofocus – Online Pomodoro App
• MDN Web Docs – setInterval
• Canvas Circular Timer Guide

Tags: Pomodoro timer, JavaScript timer, Countdown timer, Productivity apps, Web development, JS Projects, Pomodoro technique