I have been working on pre-filling a Cognito Form based on a customers answer to a different form on our website. I have gotten to the point where the JS variables contain the strings I would like to pre-fill into different fields, but I have tried everything from putting it into the Cognito.load() function, through inserting it as the value for an input field with .value() on a element ID.

I currently have two fields that pre-fill and work just fine by inserting JS variables through Cognito.load(), but the other fields will not.

    <div class="cognito">
<script src="https://services.cognitoforms.com/s/0XJ-E4DafE--nZOqqp-Haw"></script>
          [data-field="Source"], [data-field="Query"] {display:none;}
          var url = window.location.hostname + window.location.pathname;

          var query = window.location.search;
          function getAllUrlParams(link) {

  var queryString = link ? link.split('?')[1] : window.location.search.slice(1);

  var obj = {};

  if (queryString) {

    queryString = queryString.split('#')[0];

    var arr = queryString.split('&');

    for (var i=0; i<arr.length; i++) {

      var a = arr[i].split('=');

      var paramNum = undefined;
      var paramName = a[0].replace(/\[\d*\]/, function(v) {
        paramNum = v.slice(1,-1);
        return '';

      var paramValue = typeof(a[1])==='undefined' ? true : a[1];

      if (obj[paramName]) {

        if (typeof obj[paramName] === 'string') {
          obj[paramName] = [obj[paramName]];

        if (typeof paramNum === 'undefined') {


        else {

          obj[paramName][paramNum] = paramValue;

      else {
        obj[paramName] = paramValue;

  return obj;
          var nameFirst = decodeURIComponent(getAllUrlParams().nf);
          var nameLast = decodeURIComponent(getAllUrlParams().nl);
          var userEmail = decodeURIComponent(getAllUrlParams().e);
          var userPhone = decodeURIComponent(getAllUrlParams().p);
          Cognito.load("forms", { id: "44", entry: { "Source": url, "Query" : query, "Name": {"First": nameFirst, "Last": nameLast}, "Phone": userPhone, "PrimaryEmailAddress": userEmail}

As I mentioned above, the variables nameFirst, nameLast, userEmail, and userPhone all contain the proper information in them in my console. Insights would be appreciated!

1 Answer 1


Disclaimer: I'm an engineer on the Cognito Forms team!

I created a mock form and was unable to replicate the problem, however, a few things you might want to note:

  • If you make your Source and Query field's visibility Internal, you can still pre-populate it, and it will not be visible to your end users
  • If your contact information fields (Name, Phone, and PrimaryEmailAddress) are within a section, you must specify the section name in the pre-fill. One way to determine the underlying structure of the form is to set up a test JSON webhook (as outlined in this article), create a sample entry, and take a look at the JSON output that is captured by requestb.in.

If you would like specific assistance with your form, please contact us via the Support option in the top-level menu.

  • Hi Bobby, I have tried everything from using the section name (BasicInformation) to target as seen below (from the help article on your website), to targeting with just the field name: "BasicInformation": [{"Name": {"First": nameFirst, "Last": nameLast}}, "Phone": userPhone, "PrimaryEmailAddress": userEmail] Let me know if there's something wrong with the way that was formatted, but as I said before, the odd part is that the Source and Query fields DO autofill, but the others don't. Thanks!
    – sjohns
    Nov 17, 2017 at 18:56

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