Automatically adds udm=14 to google search results

udm14-append.js

// ==UserScript==
// @name         Google Search UDM Parameter with Override
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Automatically adds &udm=14 to Google searches with override options
// @author       Your name
// @match        *://www.google.com/*
// @match        *://google.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
    'use strict';

    // Check if it's a search page and doesn't already have udm parameter
    if (window.location.pathname === '/search') {
        // Don't redirect if there's a 'noudm' parameter or if it already has udm=14
        if (!window.location.href.includes('noudm') && !window.location.href.includes('udm=14')) {
            const separator = window.location.href.includes('?') ? '&' : '?';
            window.location.href = window.location.href + separator + 'udm=14';
        }
    }
})();