How is data exchange implemented via WebSocket on the client side in web applications?

Data exchange via WebSocket on the client side in web applications is implemented using the JavaScript WebSocket API, which allows establishing a persistent bidirectional connection with the server.

Main steps:

1. Creating a WebSocket object with the server URL:

const socket = new WebSocket('ws://example.com/socket');

2. Handling events:

• onopen — connection established
• onmessage — message received from the server
• onerror — connection error
• onclose — connection closed

3. Sending messages to the server:

socket.send('Hello, server!');

Example:

const socket = new WebSocket('ws://localhost:8080/ws');

socket.onopen = () => {
  console.log('Connection opened');
  socket.send('Hello from client');
};

socket.onmessage = (event) => {
  console.log('Message received:', event.data);
};

socket.onerror = (error) => {
  console.error('Error:', error);
};

socket.onclose = () => {
  console.log('Connection closed');
};

Thus, WebSocket provides efficient real-time data exchange between client and server without the need for constant HTTP requests.