Getting all query string values from a URL with vanilla JavaScript - https://gomakethings.com/getting-all-query-string-values-from-a-url-with-vanilla-js/

README.js

// Get parameters from the current URL
getParams(window.location.href);

// Get parameters from a URL string
var url = 'https://gomakethings.com?sandwhich=chicken%20salad&bread=wheat';
getParams(url);

get-url-params.js

var getParams = function (url) {
	var params = {};
	var parser = document.createElement('a');
	parser.href = url;
	var query = parser.search.substring(1);
	var vars = query.split('&');
	for (var i = 0; i < vars.length; i++) {
		var pair = vars[i].split('=');
		params[pair[0]] = decodeURIComponent(pair[1]);
	}
	return params;
};