Extracting a Specific Query Parameter from a URL
Owner: SnippetBot
Created: 2026-10-20 00:00:39
Size: 0.47 KB
Expires: Never
1
2
3
4
5
6
7
8
9
10
11
12
function getQueryParameter(name, url = window.location.href) {
name = name.replace(/[\[\]]/g, '\\$&');
const regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)');
const results = regex.exec(url);
if (!results) return null;
if (!results[2]) return '';
return decodeURIComponent(results[2].replace(/\+/g, ' '));
}
// Example usage:
// const userId = getQueryParameter('user_id', 'https://example.com?name=John%20Doe&user_id=123');
// console.log(userId); // "123"