Uncaught ReferenceError: require is not defined

[chamini prashakthi]

In my js file I used the require command to import some libraries
like
var websocket = require('ws');

I added that js file to my index file like this way,
<script type="text/javascript" src="name_of_the Js_file.js"></script>


but when I load that file it shows as Uncaught ReferenceError: require is not defined in the browser console. How to resolve that issue?