JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button" id="add">Add Field</button>

JavaScript

$("#add").click(function(){
    var name = 'textbox[*]'.replace('*', $('.newRow').length + 1);
    $('<input>')
        .attr({'type':'text', 'name': name})
        .val('new')
        .addClass('newRow')
        .insertBefore("button#add")
        .after('<input type="button" class="remove" value="Remove"><br/>');
});
$(document).on("click",".remove",function(){
  $(this).prev().remove()
  $(this).next().remove()
$(this).remove()  
})