URL encode of json

encode.js

function encodeLength(n) {
	return String.fromCharCode('A'.charCodeAt(0) + n);
}
function urlEncodeJspbLite(json, fragments = [], prefix="") {
	for (const n in json) {
  	const key = prefix + (n.length != 1 ? encodeLength(n.length) : '') + n;
    const value = json[n];
    if (typeof value === 'object') {
    	urlEncodeJspbLite(value, fragments, key);
    } else {
    	fragments.push(`${key}=${encodeURIComponent(value)}`);
    }
  }
  return fragments;
}
console.log(urlEncodeJspbLite({"2":1,"3":{"1":0,"2":"ca-pub-456"},"11":{"3":1}}).join('&'));