Answers for "javascript use object as query string"

js query string from object

const params = {lat: 35.681236, lng: 139.767125, zoom: 15};
new URLSearchParams(params).toString();
// "lat=35.681236&lng=139.767125&zoom=15"

// OR

const queryString = Object.keys(params).map(key => {
  encodeURIComponent(key) + '=' + encodeURIComponent(params[key])
}).join('&');

javascript object to query string

function objectToQueryString(obj) {
  var str = [];
  for (var p in obj)
    if (obj.hasOwnProperty(p)) {
      str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
    }
  return str.join("&");
}

var person = { first_name : "Marty",last_name : "Mcfly"};
var queryString=objectToQueryString(person); //"first_name=Marty&last_name=Mcfly"