How to Get the File Extension in Node.js

In certain cases, you may come across the need to determine the extension of a file, such as an image file. To accomplish this task effectively in Node.js, you can utilize the path built-in module and its extname() method. Below is an example of how to use this method:

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

By employing the path module and its extname() method, you can easily extract the extension from the given file name.