Join the AI Workshop to learn more about AI and how it can be applied to web development. Next cohort February 1st, 2026
The AI-first Web Development BOOTCAMP cohort starts February 24th, 2026. 10 weeks of intensive training and hands-on projects.
I had the need to find the extension of a file.
I had the name of the file, in my case an image, and wanted to get the extension (.jpg, .png..).
To do this, you can use the path built-in module and its extname() 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