socket.io and express code example
Example 1: socket io script
<script src="/socket.io/socket.io.js"></script>
<script>
const socket = io();
</script>
Example 2: how to run socket.io server
const express = require("express");
const http = require("http");
const socketIo = require("socket.io");
const port = process.env.PORT || 8001;
const index = require("./routes/index");
const app = express();
app.use(index);
const server = http.createServer(app);
const io = socketIo(server); // < Interesting!
const getApiAndEmit = "TODO";
Example 3: js socket.emit
const socket = io('ws://localhost:3000');
socket.on('connect', () => {
// either with send()
socket.send('Hello!');
// or with emit() and custom event names
socket.emit('salutations', 'Hello!', { 'mr': 'john' }, Uint8Array.from([1, 2, 3, 4]));});
// handle the event sent with socket.send()
socket.on('message', data => {
console.log(data);
});
// handle the event sent with socket.emit()
socket.on('greetings', (elem1, elem2, elem3) => {
console.log(elem1, elem2, elem3);
});
Example 4: socket.io documentation
const socket = new WebSocket('ws://localhost:3000');socket.onopen(() => { socket.send('Hello!');});socket.onmessage(data => { console.log(data);});
Example 5: simple socket.io chat
npm install socket.io