Lesson 57/100

Tutorials JavaScript Tutorial

Notifications — Complete Guide

Notifications — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of JavaScript Tutorial on Toolliyo Academy.

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JavaScript Tutorial · Lesson 57 of 100

Notifications

Basics ✓Objects & data ✓Async & DOM ✓AdvancedToolsProjects

Advanced · 4 — Production skills · ~10 min · JS HTML DOM & Web APIs

What is this?

The Notifications API shows system notifications when the tab is in the background — after user permission.

Why should you care?

Chat apps and reminders alert users without staring at the tab.

See it live — copy this example

Paste into an HTML file or the browser console (F12). Use Run below when the live editor is available.

async function notify() {
  if (!("Notification" in window)) return;
  const perm = await Notification.requestPermission();
  if (perm === "granted") {
    new Notification("Hello", { body: "You subscribed!" });
  }
}

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

Code
Result

What happened?

  • requestPermission must follow a user gesture (click).
  • Denied permission cannot be re-prompted easily.

Practice next

  1. Wire notify() to a button click.
  2. Handle denied and default permission states.
  3. Log Notification.permission.
  4. Add icon and tag options to avoid duplicate notification stacks.
  5. Close notification automatically with setTimeout after 5s.

Remember

Request permission on click new Notification(title, options) Respect user choice

ScriptVerse payment alert

After user opts in, browser notification fires when a large transfer completes.

Outcome: Notifications re-engage users even when ScriptVerse tab is in background.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

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Explain the difference between HTML4 and HTML5.
Short answer: HTML5 is the modern evolution of HTML4, introducing better structure, multimedia support, and APIs. Explain a bit more Follow me on LinkedIn: HTML4 mainly focused on document markup, while HTML5 focuses on…
Mid PDF Detailed
Class selector: Targets elements with a class.?
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Mid PDF Detailed
How does the browser parse and render HTML?
Short answer: When a browser loads a webpage, it goes through these main steps: Real-world example (ShopNest) ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling…
Junior PDF Detailed
What is Bootstrap?
Short answer: Follow me on LinkedIn: Bootstrap is a popular front-end framework for building responsive, mobile-first web pages using HTML, CSS, and JavaScript components. Real-world example (ShopNest) ShopNest’s browser…
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JavaScript Tutorial
Course syllabus

JavaScript Tutorial

Tutorial — Basics
Control Flow & Functions
Objects & Collections
Strings, Dates & RegEx
Async JavaScript
HTML DOM & Web APIs
Advanced
Performance & Security
Testing & Tooling
Projects
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