Building Your Learning Module...
Getting things ready for you!
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Imagine you want to talk to your friend. You have two choices:
You write an email → Wait for reply → Write again → Wait again...
Slow and one-way at a time!
You call once → Both can talk anytime → Instant back and forth!
Fast and two-way communication!
Messages arrive in milliseconds!
Both sides can send anytime!
No need to reconnect!
// 1. Connect
const socket = new WebSocket('ws://localhost:8080');
// 2. When connected
socket.addEventListener('open', () => {
console.log('Connected! 🎉');
socket.send('Hello from client!');
});
// 3. Receive messages
socket.addEventListener('message', (event) => {
console.log('Got message:', event.data);
});
// 4. Handle errors
socket.addEventListener('error', (error) => {
console.error('Error:', error);
});
// 5. Handle disconnection
socket.addEventListener('close', () => {
console.log('Disconnected');
});WhatsApp, Slack, Discord
Instant messaging!
Stock prices, sports scores
Updates every second!
Multiplayer games
Real-time player moves!
Push notifications
Instant alerts!
Use the 'open' event before sending messages!
Like HTTPS, use secure WebSocket (wss://) for real websites!
Always listen for 'close' event and try to reconnect!
You can't connect to regular websites! Need a special WebSocket server.
A way to have a "phone call" with a server - both can talk anytime!
Instant messages, real-time updates, no delays!
1) Connect 2) Listen for 'open' 3) Send/receive messages!
Chat apps, live data, gaming, notifications!
🎉 You now understand WebSocket basics! 🎉
Start small, experiment, and build amazing real-time apps! 🚀