JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.maskedinput/1.4.1/jquery.maskedinput.min.js"></script>
   <div class="form-group">
                      <label for="inputEmail3" class="col-sm-2 control-label">Período:</label>
                      <div class="row">
                          <div class="col-sm-2">
                            <input autocomplete="off" id="idPeriodoInicio" class="form-control monthPicker listar_uj" name="periodoInicio" id="periodoInicio"  placeholder="Período Inicial">
                          </div>

                      </div>
                    </div>

JavaScript

$(document).ready(function () {
        $('#idPeriodoInicio').mask('99/99');
        return false;
    });