baseddata.io/static/js/lib/helper-functions.js

function queryConstructor(customFilters = {}) {
  let filters = document.querySelectorAll(".filter");
  let queryObject = {};

  Object.assign(queryObject, customFilters);

  filters.forEach((filter) => {
    const filterId = filter.getAttribute("idFilter");
    const filterValue = filter.value;
    queryObject[filterId] = filterValue;
  });

  let queryString = `query=${JSON.stringify(queryObject)}`;

  return queryString;
}