JSFiddle - React, Tailwind, and code Playground

HTML

<textarea rows="4" cols="50"></textarea>

JavaScript

$('textarea').keypress(function (e){
    if(e.keyCode == 13){
        e.preventDefault();
        this.value = this.value.substring(0, this.selectionStart)+"<br />"+"\n"+this.value.substring(this.selectionEnd,this.value.length);
    }
});