Node.js http.server.listening Property
Last Updated :
05 Apr, 2023
Improve
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 a parameter.
Return Value: It does not return any value.
Example 1: Filename: index.js
Javascript
// Node.js program to demonstrate the// server.listening APi// Importing http moduleconst http = require('http');// Setting up PORTconst PORT = process.env.PORT || 3000;// Creating http Serverconst 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() apihttpServer.listen(PORT, () => { console.log("Server is running at port 3000...");});// checking if the server is listening or notif (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 moduleconst http = require('http');// Request and response handlerconst 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() apiconst httpServer = http.createServer( http2Handlers).listen(3000, () => { console.log("Server is running at port 3000..."); });// checking if the server is listening or notif (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
