Node.js URL.protocol API

The url.protocol is an inbuilt application programming interface of class URL within url module which is used to get and set the protocol portion of the URL. When a URL is parsed using one of the special protocols, the url.protocol property may be changed to another special protocol but cannot be changed to a non-special protocol, and vice versa.

Syntax:

const url.protocol

Return value: It returns the protocol portion of the URL.

Below examples illustrate the use of url.protocol method in Node.js:

Example 1:

Javascript

// Node program to demonstrate the
// url.protocol API as Setter

// Importing the module 'url'
const http = require('url');

// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');

// Display href value of myURL before change
console.log("Before Change");
console.log(myURL.href);

// Assigning protocol portion
// using protocol
console.log();
myURL.protocol = 'http';

// Display href value of myURL after change
console.log("After Change");
console.log(myURL.href);

Output: 

Before Change
https://geeksforgeeks.org:80/foo#ram

After Change
http://geeksforgeeks.org/foo#ram

Example 2: This example changes the special protocol to a non-special protocol. 

Javascript

// Node program to demonstrate the
// url.protocol API as Setter

// Importing the module 'url'
const http = require('url');

// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');

// Display href value of myURL before change
console.log("Before Change");
console.log(myURL.href);

// Assigning protocol portion
// with non special protocol
// using protocol
console.log();
myURL.protocol = 'xyz';

// Display href value of myURL after change
console.log("After Change");
console.log(myURL.href);

Output: 

Before Change
https://geeksforgeeks.org:80/foo#ram

After Change
https://geeksforgeeks.org:80/foo#ram

Example 3:

Javascript

// Node program to demonstrate the
// url.protocol API as Getter

// Importing the module 'url'
const http = require('url');

// Creating and initializing myURL
const myURL = new URL('https://geeksforgeeks.org:80/foo#ram');

// Getting the protocol portion
// using protocol
const protocol = myURL.protocol;

// Display hash value
console.log("Protocol of current url is : " + protocol);

Output: 

Protocol of current url is : https:

Note: The above program will compile and run by using the node myapp.js command. 
Reference: https://nodejs.org/api/url.html#url_url_protocol