Show data from json to a datatable in php

Good evening; I hope you can help me, I have a small problem when displaying the data within a datatable, the data if they are shown in the index but not within the datatable.

This is the JS code inside my index.php

$(document).ready(function(){
    $.ajax({
                url: 'getjson.php',
                dataType: 'json',
            })

    .done(function(data){
        console.log(data);
        $.each(data.datos, function(i,post){
        var newRow =
        "<tbody>"
        +"<tr>"
        +"<td>"+post.login+"</td>"
        +"<td>"+post.email+"</td>"
        +"<td>"+post.nombre+"</td>"
        +"<td>"+post.apellido+"</td>"
        +"<td>"+post.cargo+"</td>"
        +"<td>"+post.direccion+"</td>"
        +"<td>"+post.gerencia+"</td>"
        +"<td>"+post.jefatura+"</td>"
        +"<td>"+post.jefe_inmediato+"</td>"
        +"</tr>"
        +"</tbody>";
        $(newRow).appendTo("#json-data");
    })
    .fail(function(){
        alert('Error');
    })
    });

But being called from the table with the id="json-data" the data loads it outside the datatable.

This is my getjson.php file in which I get the data from the bd

<?php

    require_once 'dbconfig.php';

    $posts = array();
    $query = ("SELECT * FROM user ");

    $stmt = $db_con->prepare($query);
    $stmt->execute();

    while($row=$stmt->fetch(PDO::FETCH_ASSOC)) {

        //$posts['datos'][] = $row;
        $posts['datos'][] = array_map("utf8_encode", $row);
    }

    echo json_encode($posts);

?>

and finally this is the code of the table

<table id="json-data" class="table table-striped table-bordered" >
                        <thead>
                            <tr>
                                <th> Login </th>
                                <th> Email </th>
                                <th> Nombre </th>
                                <th> Apellidos </th>
                                <th> Cargo </th>
                                <th> Dirección </th>
                                <th> Gerencia </th>
                                <th> Jefatura </th>
                                <th> Jefe Inmediato </th>
                            </tr>
                        </thead>
                        <tbody>

                        </tbody>
                    </table>

I hope you can help me.