JSFiddle - React, Tailwind, and code Playground

HTML

<input type='file' name="file" id="myFile1" />

JavaScript

$("document").ready(function() {
     $("#myFile1").change(function() {
         var f1 = document.getElementById("myFile1").value; // will get file input value
         var size = ($("#myFile1")[0].files[0].size);

         if (size < 1048576) {
             alert("file size is less than 1mb");
         } else {
             alert("file size should not exceed more than 1mb");
             $(this).val($.data(this, 'f'));
             return false;
         }
     });
 });