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.
On this page
JavaScript Tutorial · Lesson 57 of 100
Notifications
Basics ✓ → Objects & data ✓ → Async & DOM ✓ → Advanced → Tools → Projects
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.
What happened?
- requestPermission must follow a user gesture (click).
- Denied permission cannot be re-prompted easily.
Practice next
- Wire notify() to a button click.
- Handle denied and default permission states.
- Log Notification.permission.
- Add icon and tag options to avoid duplicate notification stacks.
- 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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