JAVASCRIPT

how to get the extension from filename using javascript

var ext = fileName.substr(fileName.lastIndexOf('.') + 1);

JavaScript - How to get the extension of a filename

let filename = "index.js";
let extension = filename.split(".").pop();

console.log(extension); // "js"

file extension name in js

const path = require('path')

path.extname('picture.png') //.png
path.extname('picture.of.a.dog.png') //.png
path.extname('picture.of.a.dog.jpg') //.jpg
path.extname('picture.of.a.dog.jpeg') //.jpeg