Node.js Net

Node.js Net

Node.js comes with powerful networking capabilities, including support for socket programming. Using the built-in net module, developers can create applications that establish communication between clients and servers. This is the foundation for building chat systems, messaging platforms, or any application that requires two-way communication.

The net module provides tools to set up both servers and clients seamlessly. Let’s walk through an example to understand how it works.

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Node.js Net Example

In the following demonstration, we will use two command prompts:

• Node.js command prompt → for running the server
• Windows default command prompt → for running the client

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Server Code

File: net_server.js

const net = require('net');  

var server = net.createServer((socket) => {  
  socket.end('goodbye\n');  
}).on('error', (err) => {  
  // handle errors here  
  throw err;  
});  

// grab a random port.  
server.listen(() => {  
  address = server.address();  
  console.log('opened server on %j', address);  
});  

Run the server with the following command in the Node.js prompt:

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node net_server.js

Client Code

File: net_client.js

const net = require('net');  

const client = net.connect({port: 50302}, () => { // use same port as server  
  console.log('connected to server!');  
  client.write('world!\r\n');  
});  

client.on('data', (data) => {  
  console.log(data.toString());  
  client.end();  
});  

client.on('end', () => {  
  console.log('disconnected from server');  
});  

Run the client with this command in your command prompt:

node net_client.js

Node.js Net Example 2

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When working with the net module, it’s important to ensure that both the client and the server are using the same port number. If the ports do not match, the connection will fail.

With this flexibility, developers can easily implement real-time applications that rely on socket communication.

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