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const querystring = '?answer=42';
const params = new URLSearchParams(querystring);

params.get('answer'); 

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const querystring = '?answer=42&question=unknown';
const params = new URLSearchParams(querystring);

Array.from(params.keys()); 
Array.from(params.entries()); 

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function parse(qs) {
  return qs.
    replace(/^\?/, '').
    split('&').
    map(str => str.split('=').map(v => decodeURIComponent(v)));
}

parse('?answer=42&question=unknown');