JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file" />
<div></div>

JavaScript

var input = document.querySelector("input"),
	div = document.querySelector("div");

function analyse(e){
	var file = e.target.files[0];
	
	div.innerHTML = "Type : "+ file.type +"<br />"+ "Taille : "+ file.size +" octets";
}

input.addEventListener("change", analyse, false);