JSFiddle - React, Tailwind, and code Playground

by zjcqoo

HTML

<input type="file" id="f">

JavaScript

function onFileLoad(e) {
    var text = e.target.result;
    alert(text);
}

f.onchange = function(e) {
    var file = e.target.files[0];
    var reader = new FileReader();
    
    reader.onload = onFileLoad;
    reader.readAsText(file);
};