JSFiddle - React, Tailwind, and code Playground
HTML
<pre id="input"></pre>
<hr>
<pre id="output"></pre>JavaScript
var str = "Hello\r\nhow are you\r\n\r\n0123456789\r\n0123456789";
document.getElementById("input").innerHTML = JSON.stringify(str);
document.getElementById("output").innerHTML = JSON.stringify(str.replace(/(?:\\[rn]|[\r\n])/g, "<br/>"));