From JSON to HTML Table

function solve(input){
    const parsed = JSON.parse(input);
    let outputArr = ['<table>'];
    outputArr.push(makeKeyRow(parsed));
    parsed.forEach(obj=>{
        outputArr.push(makeValueRow(obj))
    });
    outputArr.push('</table>');

    function makeValueRow(obj){
        let valBlock = '<tr>';
        Object.entries(obj).forEach(pair=>{
            let value = pair[1];
            if(typeof value === 'string'){
                value = value.replace(/&/g, '&amp;')
                     .replace(/</g, '&lt;')
                     .replace(/>/g, '&gt;')
                     .replace(/"/g, '&quot;')
                     .replace(/'/g, '&#39;')
            }

            valBlock += `<td>${value}</td>`
        });
        valBlock +='</tr>';
        return valBlock;
    }

    function makeKeyRow(arr) {
        let keyRow = '<tr>';
        Object.keys(arr[0]).forEach(key=>
                keyRow += `<th>${key}</th>`

            );
        keyRow += '</tr>';
        return keyRow;
    }



    return outputArr.join('\n');
}