JSFiddle - React, Tailwind, and code Playground

HTML

<div id="res"></div>
<div id="error"><div>

JavaScript

fetch('https://httpbin.org/status/400', {method: 'POST'}).then(function(res) {
    document.getElementById('res').textContent = JSON.stringify(res);
}).catch(function(err) {
    document.getElementById('error').textContent = err;
});