Download textarea to txt file
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea id="mytextarea"></textarea>
<a id="mybutton" href="" download="output.txt">Export to .txt</a>
CSS
textarea {
width: 400px;
height:200px;
}
JavaScript
$('#mybutton').click(function(){
var data = $('#mytextarea').val();
this.href = "data:text/plain;charset=UTF-8," + encodeURIComponent(data);
});