How to post a dynamic form using json data?

// Post dynamic form using json data function post(uri, data, method) {

// when method not provided use default post method
method = method || "post";
   
var form = document.createElement("form");

form.setAttribute("method", method);

form.setAttribute("action", uri);

for (var property in data) {

  if (params.hasOwnProperty(property)) {

    var hiddenField = document.createElement("input");

    hiddenField.setAttribute("type", "hidden");

    hiddenField.setAttribute("name", property);

    hiddenField.setAttribute("value", data[property]);
 
   form.appendChild(hiddenField);

  }

}

document.body.appendChild(form);

form.submit();

}