Convert multidimensional JavaScript object to x-www-form-urlencoded request object.

object-to-x-www-form-urlencoded-converter.js

const convert = function(arr, startPath = "") {
	const getType = q => Object.prototype.toString.call(q);

	function converter(list, path, result = {}) {
		for (let key in list) {
			let _path = `${path}[${key}]`;
			let item = list[key];
			let typeVal = getType(item);
			if (("[object Array]" === typeVal) || ("[object Object]" === typeVal)) {
				converter(item, _path, result);
			} else {
				result[_path] = item;
			}
		}
		return result;
	}
	return converter(arr, startPath);
};

//let's say we have some complex object like this
let arr = [{"a":1,"b":[1,2,3]},[{"c":4,"d":5,"e":[6,{"f":7}]}],8];

console.log(convert(arr, "name")); //with name
/*
  {
    name[0][a]: 1
    name[0][b][0]: 1
    name[0][b][1]: 2
    name[0][b][2]: 3
    name[1][0][c]: 4
    name[1][0][d]: 5
    name[1][0][e][0]: 6
    name[1][0][e][1][f]: 7
    name[2]: 8
  }
*/


console.log(convert(arr)); //without name
/*
  {
    [0][a]: 1
    [0][b][0]: 1
    [0][b][1]: 2
    [0][b][2]: 3
    [1][0][c]: 4
    [1][0][d]: 5
    [1][0][e][0]: 6
    [1][0][e][1][f]: 7
    [2]: 8
  }
*/