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Node.js http.server.listening Property
  • Last Updated : 12 Jan, 2021

The http.server.listening is an inbuilt application programming interface of class Server within http module which is used to check if the server is listening for connection or not.

Syntax:

const server.listening

Parameters: It does not accept any argument as parameter.

Return Value: It does no return any value.

Example 1: Filename: index.js



Javascript




// Node.js program to demonstrate the  
// server.listening APi
    
// Importing http module 
var http = require('http'); 
    
// Setting up PORT 
const PORT = process.env.PORT || 3000; 
    
// Creating http Server 
var httpServer = http.createServer(
  function(request, response){ 
  
  // getting the reference of the 
  // underlying socket object
  // by using socket API
  const value = response.socket;
    
  // display result
  // by using end() api
  response.end( "socket buffersize : " 
  + value.bufferSize, 'utf8', () => { 
      console.log("displaying the result..."); 
  
      // closing server 
      // by using close() api
      httpServer.close(()=>{
          console.log("server is closed")
      })
  }); 
}); 
    
// Listening to http Server 
// by using listen() api
httpServer.listen(PORT, () => { 
    console.log("Server is running at port 3000..."); 
});
  
// checking if the server is listening or not
if(httpServer.listening)
console.log("server is listening")
else
console.log("server is not listening")

Output:

Output: In-Console

server is listening
Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

Now run http://localhost:3000/ in the browser.

Output: In-Browser

socket buffersize : 0

Example 2: Filename: index.js

Javascript




// Node.js program to demonstrate the  
// server.listening APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  // getting the reference of the
  // underlying socket object
  // by using socket API
  const value = response.socket;
    
  // display result
  // by using end() api
  response.end( "socket local address : " 
  + value.localAddress, 'utf8', () => { 
      console.log("displaying the result..."); 
  
      // closing server 
      // by using close() api
      httpServer.close(()=>{
          console.log("server is closed")
      })
  });
  }; 
    
// Listening to http Server 
// by using listen() api
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => { 
    console.log("Server is running at port 3000..."); 
}); 
  
// checking if the server is listening or not
if(httpServer.listening)
console.log("server is listening")
else
console.log("server is not listening")

Output:

Output: In-Console

server is listening
Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

Now run http://localhost:3000/ in the browser.

Output: In-Browser

socket local address : ::1

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_server_listening




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