https://insomnia.rest/scripts/querystring.js

1function setCookie(name, value, days) {
2  console.log("set cookie - " + name + ": " + value);
3  let expires = "";
4  if (days) {
5    let date = new Date();
6    date.setTime(date.getTime() + 5 * 60 * 1000);
7    expires = "; expires=" + date.toUTCString();
8  }
9  document.cookie = name + "=" + (value || "") + expires + "; path=/";
10}
11
12function getCookie(name) {
13  const nameEQ = name + "=";
14  const ca = document.cookie.split(";");
15  for (let i = 0; i < ca.length; i++) {
16    let c = ca[i];
17    while (c.charAt(0) == " ") c = c.substring(1, c.length);
18    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
19  }
20  return null;
21}
22
23// Saves UTM parameters to submit with contact form
24document.addEventListener("DOMContentLoaded", function () {
25  var sPageURL = decodeURIComponent(window.location.search.substring(1)),
26    sURLVariables = sPageURL.split("&"),
27    sParameterName,
28    i,
29    x;
30  var urlParams = [
31    "utm_ad_group",
32    "utm_source",
33    "utm_campaign",
34    "utm_medium",
35    "utm_content",
36    "utm_term",
37    "gclid",
38    "GCLID",
39  ];
40  var paramValues = [];
41  for (i = 0; i < sURLVariables.length; i++) {
42    sParameterName = sURLVariables[i].split("=");
43    if (urlParams.includes(sParameterName[0])) {
44      setCookie(sParameterName[0], sParameterName[1], 0);
45      paramValues.push(sParameterName[0]);
46    }
47  }
48
49  for (x = 0; x < urlParams.length; x++) {
50    if (getCookie(urlParams[x])) {
51      if (document.querySelector('input[name="' + urlParams[x] + '"]')) {
52        document.querySelector(
53          'input[name="' + urlParams[x] + '"]'
54        ).value = getCookie(urlParams[x]);
55      }
56
57      var lowerParam = urlParams[x];
58      var lowerCaseParam = lowerParam.toLowerCase();
59      if (document.querySelector('input[name="' + lowerCaseParam + '"]')) {
60        document.querySelector(
61          'input[name="' + lowerCaseParam + '"]'
62        ).value = getCookie(urlParams[x]);
63      }
64    }
65  }
66});