HTML
<table id="table">
<tr>
<td>Alfreds Futterkiste</td>
<td>Maria Anders</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Laughing Bacchus Winecellars</td>
<td>Yoshi Tannamuri</td>
<td>Canada</td>
</tr>
<tr>
<td>Magazzini Alimentari Riuniti</td>
<td>Giovanni Rovelli</td>
<td>Italy</td>
</tr>
</table>
JS code to create JSON Array
var table = document.getElementById('table');
var jsonArr = [];
for(var i =0,row;row = table.rows[i];i++){
var col = row.cells;
var jsonObj = {
company : col[0].innerHTML,
contact : col[1].innerHTML,
country : col[2].innerHTML
}
jsonArr.push(jsonObj);
}
console.log(jsonArr);
https://jsfiddle.net/0h957km9/3/