// Created on savesnippets.com · https://savesnippets.com/DVJPvg7NoNi2Lx
function parseQuery(input) {
  const search = input.includes('?') ? input.split('?')[1] : input;
  return Object.fromEntries(new URLSearchParams(search));
}

function buildQuery(params) {
  return new URLSearchParams(
    Object.entries(params).filter(([, v]) => v !== null && v !== undefined)
  ).toString();
}

// Usage
console.log(parseQuery('?page=2&q=hello+world&sort=asc'));
// { page: '2', q: 'hello world', sort: 'asc' }

console.log(buildQuery({ page: 2, q: 'hello world', empty: null }));
// page=2&q=hello+world