Introduction to mock-socket

mock-socket is a powerful JavaScript library designed to create mock WebSocket servers. This allows developers to test and develop real-time WebSocket applications without needing an actual server. With dozens of useful APIs, it simplifies the process of creating and testing WebSocket connections in a controlled environment.

Core APIs of mock-socket

Creating a WebSocket Server

mock-socket allows you to create a WebSocket server effortlessly:

 const { Server } = require('mock-socket'); const server = new Server('ws://localhost:8080'); 

Handling Client Connections

Listen for new connections to your mock WebSocket server:

 server.on('connection', socket => {
  console.log('Client connected');
}); 

Sending Messages

Send messages to connected clients:

 server.clients.forEach(client => {
  client.send('Hello Client!');
}); 

Receiving Messages

Handle incoming messages from clients:

 server.on('message', message => {
  console.log('Received from client:', message);
}); 

Closing Connections

Close client connections:

 server.clients.forEach(client => {
  client.close();
}); 

Complex Example: Chat Application

Let’s create a simple chat application using these APIs.

 const { Server, WebSocket } = require('mock-socket'); const server = new Server('ws://localhost:8080');
server.on('connection', socket => {
  console.log('Client connected');

  socket.on('message', message => {
    console.log('Received from client:', message);
    // Echo the message back to all clients
    server.clients.forEach(client => {
      if (client !== socket) {
        client.send(message);
      }
    });
  });

  socket.send('Welcome to the chat!');
});
// Client side example const client = new WebSocket('ws://localhost:8080');
client.onopen = () => {
  console.log('Connected to server');
  client.send('Hello Server!');
};
client.onmessage = event => {
  console.log('Received from server:', event.data);
}; 

This example demonstrates a basic chat application where messages sent by one client are broadcast to all other connected clients.

With mock-socket, you can easily test and develop WebSocket applications in a controlled environment, ensuring reliability and functionality before deploying to a live server.

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