Node.js URL.port API

Last Updated : 14 Oct, 2021

The url.port is an inbuilt application programming interface of class URL within url module which is used to get and set the port portion of the URL.the port value may be a number or a string containing a number in the range 0 to 65535 (inclusive). Setting the value to the default port of the URL objects given protocol will result in the port value becoming the empty string (”).
The port value can be an empty string in which case the port depends on the protocol/scheme:

Protocol	port
“ftp”	21
“file”
“gopher”	70
“http”	80
“https”	443
“ws”	80
“wss”	443

Upon assigning a value to the port, the value will first be converted to a string using .toString().
If that string is invalid but it begins with a number, the leading number is assigned to the port. If the number lies outside the range denoted above, it is ignored.

Syntax:

const url.port

Return value: It gets and sets the port portion of the URL.

Below programs illustrate the use of url.port Method:

Example 1:

Javascript

// node program to demonstrate the  
// url.port API as Setter  
   
//importing the module 'url' 
const http = require('url'); 
   
// creating and initializing myURL 
const myURL = new URL('https://example.com:80/foo#ram'); 
   
// Display href and port 
// value of myURL before change 
console.log("Before Change"); 
console.log(myURL.href); 
   
// assigning port portion 
// using port API 
console.log(); 
myURL.port = '12345'; 
   
// Display href and password 
// value of myURL after change 
console.log("After Change"); 
console.log(myURL.href); 

Output:

Example 2: If the port number is half numeric and half alphabetic

Javascript

// node program to demonstrate the  
// url.port API as Setter  
    
//importing the module 'url' 
const http = require('url'); 
    
// creating and initializing myURL 
const myURL = new URL('https://example.com:80/foo#ram'); 
    
// Display href and port 
// value of myURL before change 
console.log("Before Change"); 
console.log(myURL.href); 
    
// assigning port portion 
// using port API 
console.log(); 
myURL.port = '2580abcd'; 
    
// Display href and password 
// value of myURL after change 
console.log("After Change"); 
console.log(myURL.href); 

Output:

Example 3:

Javascript

// node program to demonstrate the  
// url.port API as Getter  
  
//importing the module 'url' 
const http = require('url'); 
  
// creating and initializing myURL 
const myURL = new URL('https://example.org/foo#ram'); 
myURL.port = '1234'
  
// getting the port portion 
// using port 
const port = myURL.port; 
  
// Display port value  
console.log("port is : " + port); 
  
//"https" default port is 443 
console.log("After Change"); 
myURL.port = '443'; 
console.log(myURL.port); 