Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<input type=text value=1234567890123456 onfocus=this.select() readonly>

CSS

input{
  padding: 16px 8px;
  font-size: 16px;
  text-align: center;
}

JavaScript

$('input').val($('input').val().replace(/\d{4}(?=\d{4})/g, '$& '));

/*
Вместо пробела использовал тонкую шпацию (&thinsp;), согласно рекомендации из статьи: https://habrahabr.ru/post/23250/
*/

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JSFiddle - React, Tailwind, and code Playground

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