JSFiddle - React, Tailwind, and code Playground

HTML

<table border="1">
<tr id="NamesGridView">
<th>Header 1</th>
<th>Header 2</th>
</tr>
<tr>
<td>row 2, cell 1</td>
<td>row 2, cell 2</td>
</tr>
</table>

JavaScript

var data = {
    d: [
        {
            FirstName: "test"
            , Age: 5
        }
    ]
};
for (var i = 0; i < data.d.length; i++) {
    $("#NamesGridView").after("<tr><td>" + data.d[i].FirstName + "</td><td>" + data.d[i].Age + "</td></tr>");
}