URL parameters can be in read in Node.js by importing the built-in url module, and using the URL and URLSearchParams objects present in it.
const url = require('url');
// new URL object
const current_url = new URL('http://usefulangle.com/preview?id=123&type=article');
// get access to URLSearchParams object
const search_params = current_url.searchParams;
// get url parameters
const id = search_params.get('id');
const type = search_params.get('type');
// "123"
console.log(id);
// "article"
console.log(type);
Getting Parameter Value By Name
The get() method of URLSearchParams object gets the value of the given parameter.
const url = require('url');
const current_url = new URL('http://usefulangle.com/preview?id=123&type=article');
const search_params = current_url.searchParams;
const id = search_params.get('id');
// "123"
console.log(id);
Getting Values of Multi-Valued Parameter
The getAll() method of URLSearchParams object returns an array of values of the given parameter.
const url = require('url');
const current_url = new URL('http://usefulangle.com/preview?tags=javascript&tags=pdfjs');
const search_params = current_url.searchParams;
const tags = search_params.getAll('tags');
// [ "javascript", "pdfjs" ]
console.log(tags);
Checking If Parameter Present
The has() method of URLSearchParams object checks whether given parameter exists in the url.
const url = require('url');
const current_url = new URL('http://usefulangle.com/preview?id=123&type=article');
const search_params = current_url.searchParams;
// true
if(search_params.has('id')) {
//
}
// false
if(search_params.has('name')) {
//
}