How is integration with WebSocket protocol implemented on the frontend?

Integration with WebSocket on the frontend is usually implemented using the built-in WebSocket object in browsers.

Main steps:

1. Create an instance of WebSocket with the server URL, for example:

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

2. Handle events:

• onopen — connection established, data can be sent.
• onmessage — data received from the server.
• onerror — connection error.
• onclose — connection closed.

3. Use the send method to send data:

socket.send(JSON.stringify({ type: 'ping' }));

4. To properly close the connection, call socket.close().

Example:

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

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

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

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

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

Thus, the frontend can exchange data with the server in real-time via WebSocket, which is useful for chats, games, notifications, and other interactive applications.