1function getAllUrlParams(url) {
2
3  // get query string from url (optional) or window
4  var queryString = url ? url.split('?')[1] : window.location.search.slice(1);
5
6  // we'll store the parameters here
7  var obj = {};
8
9  // if query string exists
10  if (queryString) {
11
12    // stuff after # is not part of query string, so get rid of it
13    queryString = queryString.split('#')[0];
14
15    // split our query string into its component parts
16    var arr = queryString.split('&');
17
18    for (var i = 0; i < arr.length; i++) {
19      // separate the keys and the values
20      var a = arr[i].split('=');
21
22      // set parameter name and value (use 'true' if empty)
23      var paramName = a[0];
24      var paramValue = typeof (a[1]) === 'undefined' ? true : a[1];
25
26      // (optional) keep case consistent
27      paramName = paramName.toLowerCase();
28      if (typeof paramValue === 'string') paramValue = paramValue.toLowerCase();
29
30      // if the paramName ends with square brackets, e.g. colors[] or colors[2]
31      if (paramName.match(/\[(\d+)?\]$/)) {
32
33        // create key if it doesn't exist
34        var key = paramName.replace(/\[(\d+)?\]/, '');
35        if (!obj[key]) obj[key] = [];
36
37        // if it's an indexed array e.g. colors[2]
38        if (paramName.match(/\[\d+\]$/)) {
39          // get the index value and add the entry at the appropriate position
40          var index = /\[(\d+)\]/.exec(paramName)[1];
41          obj[key][index] = paramValue;
42        } else {
43          // otherwise add the value to the end of the array
44          obj[key].push(paramValue);
45        }
46      } else {
47        // we're dealing with a string
48        if (!obj[paramName]) {
49          // if it doesn't exist, create property
50          obj[paramName] = paramValue;
51        } else if (obj[paramName] && typeof obj[paramName] === 'string'){
52          // if property does exist and it's a string, convert it to an array
53          obj[paramName] = [obj[paramName]];
54          obj[paramName].push(paramValue);
55        } else {
56          // otherwise add the property
57          obj[paramName].push(paramValue);
58        }
59      }
60    }
61  }
62
63  return obj;
64}
65

1// URL w/ PARAMETERS
2let origin = "https://www.google.com"
3let pathname =  "/search"
4let query = "?q=javascript%20create%20url%20with%20parameters"
5
6let url = origin + pathname + query
7
8console.log(url);