JSON

function JSONtoHtmlTable(jsonString){
  let result = '<table>';

  const arr = JSON.parse(jsonString);
  const titleSet = new Set(arr.map(i => Object.keys(i)).flat());
  const titleArray = Array.from(titleSet);

  result += '<tr></th>' + titleArray.join('</th><th>') + '</th></tr>';

  result = arr.reduce((acc,currItem)=>{
    let innerResult = titleArray.reduce((titleAcc,currTitle)=>{
      const value = currItem[currTitle];
      value = value === undefined ? '' :
       value.replace(/&/g,'&amp;')
            .replace(/</g,'&lt;')
            .replace(/>/g,'&gt;')
            .replace(/"/g,"&quot;")
            .replace(/'/g,'&#39;')

      return titleAcc + '<td>' + value + '</td>';
    },'');

    if(innerResult === ''){ return acc; }
    return acc + '<tr>' + innerResult + '</tr>';
  },result);

  return result + '</table>'
}

JSONtoHtmlTable('[{"Name":"Tomatoes & Chips","Price":2.35},{"Name":"J&B Chocolate","Price":0.96}]');