Return a JSON table using Element creation (I cannot use Jquery)

Question

Instead of returning the table in html, return in JSON and mount the table using the element creation (Document.createelement) and insertion and removal features of the DOM tree.

I need a help with that question, you can help me ?

Currently my code is like this:

<table class="table table-dark table-striped">
<thead>
  <tr>
    <th scope="col">#id_armas</th>
    <th scope="col">Nome Arma</th>
    <th scope="col">Ação</th>
  </tr>
</thead>
<?php
include 'conexao.php';
$sql = "SELECT * FROM `armas`";
$busca = mysqli_query($conexao, $sql);

while ($array = mysqli_fetch_array($busca)) {
  $id_armas = $array['id_armas'];
  $nomearma = $array['nome_arma'];
  ?>
  <tr>
    <td><?php echo $id_armas ?></td>
    <td><?php echo $nomearma ?></td>
    <td><a class="btn btn-primary btn-sm" style="color:#ffffff" href="editar_armas.php?id=<?php echo $id_armas ?>" role="button"><i class="fas fa-pencil-alt"></i>&nbsp; &nbsp; Editar</a>
      <?php if ($_SESSION['nivel'] == 1) { ?>
        <a class="btn btn-danger btn-sm" style="color:#ffffff" data-confirm='Tem certeza que deseja apagar esse item?' href="deletar_armas.php?id=<?php echo $id_armas ?>" role="button"><i class="fas fa-trash-alt"></i>&nbsp; &nbsp; Apagar</a>
      <?php } ?></td>
  </tr>
<?php
  //abrindo novamente a tag php e fechando a {} do wilhe apos o td pois o laco vai adicionar elementos ao TD.
} ?>
</tr>

and need to do this only in json and adding the table in the dom tree

    var ajax = new XMLHttpRequest();
  ajax.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      var table = document.getElementById('tabela');
      var tr = document.createElement('tr');

      table.appendChild(tr);

      var td = document.createElement('td');
      tr.appendChild(td);
      td.innerHTML = 'teste';
      var td = document.createElement('td');
      tr.appendChild(td);
      td.innerHTML = 'teste';
    }
    ajax.open("GET", "conteudotab.php");
    ajax.send();
  }