how to get the file extension in javascript if the file contains two dots code example

Example 1: javascript get file extension

var fileName = "myDocument.pdf";
var fileExtension = fileName.split('.').pop(); //"pdf"

Example 2: how to get file extension in javascript last index

var extension = fileName.substring(fileName.lastIndexOf('.')+1);

Example 3: how to get file extension in javascript

var fileName = "myDocument.pdf";
var fileExtension = fileName.split('.').pop(); //"pdf"